ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Blends of polyamide 6 and poly(etheraroylhydrazide)s prepared concurrently with polyhydrazide polymerization (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 214 (1994), S. 101-113 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polyhydrazid/Polyamid-Blends (PEHZ12/PA6) wurden durch Niedrigtemperatur-Polykondensation von 4,4′-Dichlorformyl-α,ω-diphenoxydodecan und Terephthaloyldihydrazid (TDH) zu Poly(etheraroylhydrazid) in Gegenwart von Polyamid 6 synthetisiert. Die DSC-Analysen lassen vermuten, daß die zwei Polymerkomponenten nicht wechselwirken. Bei der Extraktion des PA6-Anteils der Blends mit Ameisensäure zeigt die Charakterisierung des PEHZ12-Extraktionsrückstands aber, daß zumindest bei bestimmten Zusammensetzungen Wechselwirkungen zwischen den Komponenten auftreten. Modellreaktionen erlauben die Annahme, daß die PEHZ12-Polymerisation zwischen den Amino-Endgruppen des PA6 und den wachsenden PEHZ12-Polymerketten abläuft.
    Notes: Poly(etheraroylhydrazide) is synthesized in the presence of PA6 by means of low-temperature condensation polymerization of 4,4′-dichloroformyl-α,ω-diphenoxydodecane with terephthaloyl dihydrazide (TDH) in order to prepare polyhydrazide/poly-amide 6 (PEHZ12/PA6) blends. The thermal analysis of the blends by DSC seems to indicate that the two polymers are not interacting. Nevertheless, when the blends are subjected to an extraction process with formic acid in order to remove the PA6, the characterization of the residual PEHZ12 reveales that some interactions do occur between the constituent polymers, at least for selected compositions. Model experiments permit to hypothesize that the polymerization of PEHZ12 proceeds with a chemical interaction between amino end groups of PA6 and growing PEHZ12 chains.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052140110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Poly-ε-caprolactone/poly(Methylmethacrylate) reactive blends: Correlation between synthesis, morphology and physical properties (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 210 (1993), S. 47-59 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Blends aus Poly-ε-caprolacton (PCL) und Polymethylmethacrylat (PMMA) wurden durch Polymerisation von Methylmethacrylat in Gegenwart von PCL hergestellt. Die thermeischen, morphologischen, dynamisch-mechanischen und mechanischen Eigenschaften der Blends wurden ermittelt. Zum Vergleich wurden Blends durch mechanisches Mischen von PCL-und PMMA-Homopolymerschmelzen hergestellt und charakterisiert. Die nach beidenMethoden hergestellten Blends unterscheiden sich wesentlich in der phasenstrukturund den mechanischen eigenschafte, was wahrscheinlich auf die bildung von gepfropften Anteilen bei der erstgenannten Methode zuräuckgefäuhrt werden kann.
    Notes: Blends of poly-ε-caprolactone (PCL) and poly(methylmethacrylate) (PMMA) were prepared by a reactive method and characterized by thermal, morphological, dynamic mechanical and mechanical analyses. For comparison, “mechanical” blends, obtained by melt-mixing of preformed polymers, have been prepared and characterized. The two series of blends are different in phase structure and in mechanical tensile properties, probably due to the formation of grafted species during reactive blending.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052100105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Studies on amylose and its derivatives. Part VI. Estimation of cohesive energy densities of some amylose derivatives (1965)
    New York : Wiley-Blackwell
    Biopolymers 3 (1965), S. 69-78 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The cohesive energy densities (CED) of three amylose derivatives have been estimated from viscosity measurements in a range of solvents, by using methods proposed by Mangaraj and Bristow and Watson. The values assigned to the triacetate, (2.5) nitrate, and tricarbanilate are 92 ± 2, 90 ± 2, and 87 ± 2 cal./cc., respectively. The CED of unsubstituted amylose has been measured and found to be 154 ± 4 cal./cc. The results are discussed in relation to solvent power, structure, and possible correlation with the internal pressure of the polymer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360030108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    N-substituted maleimides as thermal stabilizers for rigid polyvinylchloride (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 23-35 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: N-substituierte Maleinimide sind thermische Stabilisatoren für Hart-Polyvinylchlorid (PVC). Dies wurde durch Messung der Dehydrochlorierungsrate und des Ausmaßes der Verfärbung des Polymeren bei 180°C in Luft untersucht. Die Ergebnisse zeigen die höhere Stabilisierungswirkung dieser Produkte im Vergleich zu Stabilisatoren wie basisches Bleicarbonat, Dibutylzinnmaleat und Cadmium-Bariumstearat, die üblicherweise in der Industrie benutzt werden. Die Induktionszeit (Ts) steigt in dem Maße, in dem der positive Resonanzeffekt (+R) der Substituenten zunimmt. Ferner bewirken die untersuchten Stabilisatoren gegenüber Stearatstabilisatoren bessere Farbbeständigkeit der abgebauten Proben. Diese Stabilisatoreffektivität ist darauf zurückzuführen, daß der Stabilisator Radikale einfangen kann, die bei dem radikalischen Abbau von PVC entstehen. Die gute Farbstabilität resultiert aus der Fähigkeit des Stabilisators, mit den konjugierten Doppelbindungen, die durch den Abbau des PVC in der Polymerkette entstehen, in Wechselwirkung zu treten. Ein Mechanismus für die Wirkungsweise des Stabilisators wird vorgeschlagen.
    Notes: N-substituted maleimides have been investigated as thermal stabilizers for rigid polyvinylchloride (PVC) at 180°C in air by measuring the rate of dehydrochlorination and the extent of discoloration of the polymer. The results reveal the higher stabilizing efficiency of these products relative to basic lead carbonate, dibutyl tin maleate, and cadmium-barium stearate stabilizers commonly used in industry. The induction period (Ts) increases as a function of the positive resonance effect of the substituents (+R). Moreover, the investigated stabilizers impart better color stability for the degraded samples as compared with the stearate stabilizer. The stabilizer efficiencies are attributed to their radical trapping potency which intervenes with the radical degradation process of PVC, while the good color stability is due to the ability of the stabilizer to interact with the conjugated double bonds formed on the PVC chains as a result of degradation. A mechanism illustrating the stabilizer's action is proposed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051680103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Impact behaviour and fractographic analysis of rubber-modified polybutyleneterephthalate obtained by reactive blending concurrently with polymerization process (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 174 (1990), S. 141-150 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Modifizierung von Polybutylenterephthalat mit Gummi wurde durch Zugabe geeignet funktionalisierter Copolymerer aus Ethylen und Propylen (EPR) und gleichzeitiger Hochtemperaturpolykondensation von 1,4-Butandiol mit Dimethylterephthalat erreicht. Die Schlagzähigkeit der Blends, die reines oder mit Ester- oder Hydroxylgruppen modifiziertes EPR enthielten, wurde mit Hilfe von Schlagbiegeversuchen nach Charpy bei verschiedenen Temperaturen bestimmt. Die morphologischen Merkmale der Bruchflächen wurden auch untersucht. Es wurde ein Versuch unternommen, die Morphologie dieser Flächen mit den Bruchanalysenergebnissen zu korrelieren.
    Notes: Rubber modification of polybutyleneterephthalate was accomplished by the addition of suitable functionalized ethylene-propylene copolymers (EPR) concurrently with the high temperature polycondensation of 1,4-butanediol and dimethylterephthalate.The impact properties of blends obtained with plain EPR, with ester or hydroxyl groups modified EPR were analyzed by Charpy tests performed at different temperatures with a Ceast fracture pendulum. The morphological features of fracture surfaces have also been investigated. An attempt has been made to correlate the morphology of the surfaces with the fracture analysis results.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051740112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Gas chromatographic studies on the compatibility of PVC with a migration resistant plasticizer (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 192 (1991), S. 81-91 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Technik der inversen Gaschromatographie (IGC) wurde zur Untersuchung der thermodynamischen Mischbarkeit (Verträglichkeit) von niedermolekularem Poly(vinylchlorid) (PVC) mit einem Poly(adipinsäureester) als Weichmacher angewendet. Die thermodynamischen Polymer-Weichmacher-Wechselwirkungsparameter wurden aus den chromatographischen Retentionsdaten verschiedener, niedermolekularer flüchtiger Substanzen als mobile Phase auf einer stationären Phase aus Polymer-Weichmacher-Mischungen, die sich über den gesamten möglichen Zusammensetzungsbereich erstreckten, ermittelt. Die Untersuchungen wurden im Temperaturbereich von 90 bis 110°C durchgeführt. Der Flory-Huggins-Wechselwirkungsparameter (χ+23) hängt dabei im wesentlichen von der chemischen Natur der als “Sonde” verwendeten flüchtigen Substanz (mobile Phase), von der Temperatur und von der Zusammensetzung der Polymer-Weichmacher-Mischung (stationäre Phase) ab. Die Ergebnisse deuten auf eine relativ gute Polymer-Weichmacher-Verträglichkeit über einen weiten Zusammensetzungsbereich (bis ca. 70 Gew.-% Weichmacher) hin; die Verträglichkeit ist damit besser als bei früheren Untersuchungen mit hochmolekularem PVC.
    Notes: The technique of inverse gas chromatography (IGC) was used to investigate the thermodynamic miscibility (compatibility) of low molecular weight PVC-poly(adipate ester) plasticizer mixtures. The polymer-plasticizer thermodynamic interaction parameters were determined from chromatographic retention data for various low molecular weight volatile solutes (probes) on stationary phase mixtures which covered the entire composition range for each component. Experiments were carried out in the temperature range of 90 to 110°C. The Flory-Huggins interaction parameter (χ+23) values were found to be dependent on the chemical nature of the probes, the temperature, and the composition of the mixed phase. The results predict a relatively high polymer-plasticizer compatibility for a wide range of polymer-plasticizer mixtures (up to approx. 70 wt.-% of plasticizer). Results were also compared to our own previous data using high molecular weight PVC.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051920107
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Transient effects in diffusion-controlled polymer cyclizationCyclization Dynamics of Polymers 24 and paper No. 7 on Transient Effects in Diffusion Controlled Reactions.Dedicated to Paul Rempp on the occasion of his 60th birthday with best wishes and thanks for many years of scientific interaction (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1333-1343 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Fluorescence decay measurements were carried out to study the kinetics of intramolecular exciplex formation in two low-molecular-weight samples of polystyrene (1) with narrow molecular weight distribution capped on one end with a pyrene moiety and on the other with an N,N-di-methylaminophenyl group. Monomer and excimer decay profiles, IM(t) and IE(t), resp., were inconsistent with the predictions of the simple two-state (Birks) model, but could be well-fitted by assuming that the diffusion-controlled rate coefficient for exciplex formation, k1(t), is time dependent. Using a Smoluchowski formulation for this rate coefficient k1(t) = a(1 + bt-1/2), we could use the a and b parameters to calculate values for the chain-end diffusion coefficient characterizing the reaction for samples of the polymers in cyclopentane and cyclohexane solutions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021900614
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and characterisation of chiral nematic liquid-crystalline copolymers with the chiral centre in the flexible spacer (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 1393-1401 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and characterisation of a series of novel chiral nematic liquid-crystalline combbranch copolymers having the chiral centre in the flexible spacer are described. The copolymers, prepared from the chiral monomer (S)-2-(4′-cyano-4-biphenylyloxy)-1-methylethyl methacrylate (7) and the nematogenic monomer 4-cyanophenyl 4-(6-acryloyloxyhexyloxy)benzoate (8), were found to form planar textures which display bright reflection colours at low chiral monomer feed values. These coloured textures could be stored reversibly by cooling below Tg.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910618
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Cyclization dynamics of polymers, 26Part 25: S. Boileau, F. Méchin, J. M. G. Martinho, M. A. Winnik, Makromolecules 22, 215 (1989).. End-to-end cyclization of polystyrene in mixed solvents. Effect of chain length (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 15 (1989), S. 113-125 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cyclization rate measurements were carried out on polystyrene chains of different molecular weights and labelled at both ends with 1-pyrenyl groups, using as solvents cyclopentane (a thetasolvent), acetone (a poor solvent), and their mixtures. These mixtures exhibit a cosolvency effect for polystyrene. The results show that the rate constants for cyclization and ring-opening are solvent- and chain-length-dependent. This was interpreted in terms of the influence of excluded volume effects on these processes. The results indicate that the solvent giving the largest excluded volume effect is an equimolar mixture of cyclopentane and acetone, which agrees with the light scattering and viscometry results for polystyrene in cyclohexane/acetone mixtures.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.020151989112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Optically active comb-branch liquid-crystalline polymers having the chiral centre in the flexible spacer, 2.Part 1: cf.6. The synthesis and characterisation of copolymers containing the novel chiral monomer (S)-2-[2-4-methoxy-4′-biphenylyloxy)-1-methylethoxy]ethyl methacrylate (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 143-151 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new series of optically active liquid-crystalline comb-branch copolymers was prepared from (S-2-[2-(4-methoxy-4′-biphenylyloxy)-1-methylethoxy]ethyl methacrylate (1) and the nematogenic monomer 4-cyanophenyl 4-(6-acryloyloxyhexyloxy)benzoate (2). These copolymers are characterised by the chiral centre being positioned in the flexible spacer. The copolymers form chiral nematic phases with temperature-dependent reflection colours at low chiral monomer compositions, and crystalline phases at higher compositions. One of the copolymers of intermediate composition forms a smectic phase in addition to a chiral nematic phase.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...