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  • 1
    Electronic Resource
    Electronic Resource
    On the Temperature Coefficient of Unperturbed Dimensions of Atactic Polystyrene (1966)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 70 (1966), S. 3057-3060 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100882a007
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational energy contribution to the heat of solution in polymer-solvent systems. Part I. Theory (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 845-853 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The conformational energy contribution (ΔUconf) to the heat of solution in polymer-solvent systems is presented and discussed in connection with chain conformational properties. In particular, ΔUconf has been discussed in terms of various possible mechanisms of coil deformation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160070509
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  • 3
    Electronic Resource
    Electronic Resource
    Energy contents of amorphous polystyrene with different thermal historiesSome of these results were presented at the International Congress on Macromolecular Chemistry, Prague, 1965. (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 743-749 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Tian-Calvet microcalorimeter has been used to measure the heat of solution of atactic polystyrene in toluene at 30°C. By using a special technique for polymer sample preparation, it has been possible to measure directly the difference in conformational energy of the polystyrene chain at different temperatures, from 30 to 100°C. and to calculate its contribution to the specific heat.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.160050409
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  • 4
    Electronic Resource
    Electronic Resource
    Conformational energy contribution to the heat of solution in polymer-solvent systems. Part II. Experimental results (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 855-866 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Heats of solution (ΔHexp) in solvents of increasing thermodynamic power have been measured for four polymers: polystyrene (PS), poly(vinyl acetate) (PVAc), polyisobutylene (PIB) and polydimethylsiloxane (PDMS). After subtraction from ΔHexp of an interaction term (calculated by the Hildebrand treatment based on solubility parameters) and the excess volume term, the quantity remaining is interpreted as the conformational energy contribution (ΔUconf) to the heat of solution. ΔUconf appears to correlate well with some basic conformational properties of the chain, such as the sign of the temperature coefficient of unperturbed dimensions derived from solution properties, and shows a monotonic behavior with α, the expansion coefficient of the polymer coil in the final solution. Numerical values of ΔUconf, at least for those cases in which polymer solubility parameters are known with some certainty, are much larger than those evaluated from rubber elasticity experiments (through the experimentally accessible value of the energy component of the force of retraction im simple elongation).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160070510
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  • 5
    Electronic Resource
    Electronic Resource
    Blends of polyamide 6 with bisphenol-A polycarbonate. I. Thermal properties and compatibility aspects (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1807-1818 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Blends of polyamide 6 (PA6) and polycarbonate (PC) have been investigated, over a full range of composition, to check interactions between them. SEM observations show that the mixtures are characterized by domains of clearly segregated homophases and voids between the two polymers. DSC and DMTA data indicate the presence of two Tg' s, corresponding to two separate phases, with the Tg of the PC phase decreasing on increasing the PA6 amount. Moreover, the crystallization kinetics of PA6 is slightly showed down by the PC. Chemical reactions between the two polymers are supposed to give rise to low molar mass compounds, as shown by GPC; these species plasticize the PC and partially dissolve into the molten polyamide, causing decrease of PC Tg and reduction of overall crystallization rate of PA6. Apparent influence of PC on melting temperature and enthalpy of PA6 is also discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070381003
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  • 6
    Electronic Resource
    Electronic Resource
    Adiabatic polymerization of ∊-caprolactam in presence of lithium chloride, 3Part 2: cf.4.. Oligomer formation (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 2131-2140 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The activated anionic polymerization of ∊-caprolactam is strongly affected by LiCl addition to the polymerizing medium. Large variations in the yield of the polymerization products are induced by increasing salt content: both high polymer and cyclic dimer yields sharply decrease as functions of the salt concentration, whereas monomer and (in part) higher oligomers show a relevant increase. Also the production of low molecular weight side products is influenced by LiCl: higher salt concentrations induce the formation of larger amounts of side compounds. Monomer equilibrium data reveal that the salt negatively affects the thermodynamics of polymerization. ΔG0p variation as a function of LiCl content shows an increasingly relevant influence of the entropic contribution to the standard free energy change. The effects of LiCl on ring-ring equilibria are qualitatively interpreted on the basis of both the strong ion-ion interactions between Li+ ions and carbonyl groups and the interchain densification process.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830910
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  • 7
    Electronic Resource
    Electronic Resource
    Adiabatic polymerization of ε-caprolactam in presence of lithium chloride, 2.part 1: cf.2. Properties of the resultant polymer (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 3519-3532 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Physical and mechanical properties of poly(ε-caprolactam) synthesized in presence of various amounts of lithium chloride are measured on compression moulded films and correlated to the molecular organization, both in the amorphous and in the crystalline regions. By increasing the amount of LiCl present in the system it can be observed a heigtening of Tg and density of the amorphous phase as well as an increase of tensile modulus and yield strength. A transition from ductile to brittle failure occurs for both semicrystalline and amorphous samples in dry conditions, when the salt content in the amorphous phase is about 6 wt.-%. These phenomena and the capability of the salt to reduce the crystallinity of the polymer are interpreted in the frame of the already accepted model of ion-dipole interactions between lithium ion and the carbonyl groups of the polyamide. Effects due to moisture uptake are also discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821215
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  • 8
    Electronic Resource
    Electronic Resource
    The morphology and structure of undoped and I2-doped polyacetylene-polybutadiene graft copolymer filmsPartially supported by “Progetto finalizzato Chimica Fine e secondaria” of C. N. R. (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1287-1294 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The morphological and structural aspects of a novel polyacetylene-polybutadiene (PA-PB) graft copolymer film were investigated by means of transmission electron microscopy (TEM), electron diffraction (ED), and wide angle X-ray diffraction (WAXS). Moreover, the evolution of these properties upon I2-vapour doping of the cast films was followed. Finally, correlations between morphology, structure, and conductivity were drawn, suggesting a possible mechanism of conduction in this material.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870524
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  • 9
    Electronic Resource
    Electronic Resource
    Viscosity and optical observation on poly(ethylene terephthalate) during annealing and thermal scanning (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 767-774 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird über einige Ergebnisse berichtet, die bei der Beobachtung von Polyäthylenterephthalat [Poly(oxyäthylenoxyterephthaloyl)] mit dem optischen Mikroskop während des isothermen Temperns und Aufheizens zwischen Zimmer- bzw. Tempertemperatur und Schmelztemperatur erhalten wurden. Parallel dazu wurden Änderungen des Molekulargewichts viskosimetrisch kontrolliert. In allen Versuchen wurden Sphärolithe beobachtet, deren Größe sich nur während der Kristallisation und im Schmelzbereich änderte. Aus den Ergebnissen wird geschlossen, daß die großen Änderungen, die das endotherme, Maximum der DSC-Kurve bei Temperaturen unterhalb der Schmelztemperatur zeigt (peak II), nur durch Änderungen der Ordnung im Innern der Sphärolithe verursacht sein können. Damit wird das von Roberts und Holdsworth vorgeschlagene Modell bestäigt.
    Notes: Some results obtained with poly(ethylene terephthalate) [poly(oxyethyleneoxyterephthaloyl)] following by optical microscopy the isothermal annealing and the thermal scanning from room temperature or annealing temperature up to the melting point are reported. Besides, the variation of the molecular weight is controlled by viscometry. It is observed that the structure is always characterized by spherulites, whose sizes change only during the crystallization and in the melting range. The conclusion is reached that the structural modifications on which the large variations of the endothermal maximum of the DSC curve below the melting temperature (peak II) depend, occur inside the spherulites. The model suggested by Roberts and Holdsworth seems to be supported by our data.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760318
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  • 10
    Electronic Resource
    Electronic Resource
    Low molecular weight polyethylene single crystals: Nucleation (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 1917-1930 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird über einige Ergebnisse berichtet, welche die Kristallkeimbildung in einer verdünnten Lösung einer engen Fraktion von Polyäthylen mit niedrigem Molekulargewicht betreffen. Der Zusammenhang zwischen der Kristallkeimzahl und einigen den Prozeß kennzeichnenden Größen, wie die Konzentration der Lösung und die Kristallisationstemperatur, läßt auf einen polymolekularen Vorgang schließen, durch den verschieden stabile Kristallkeime gebildet werden. Es werden auch andere Kenngrößen des Prozesses diskutiert, welche wahrscheinlich auch während der Kristallisation des nichtfraktionierten Polymers auftreten.
    Notes: Several results are reported concerning the nucleation mechanism connected with the crystallization from a dilute solution containing a sharp fraction of low molecular weight polyethylene. The correlation between the number of nuclei and some parameters of the process, such as the concentration of the solution and the crystallization temperature, suggests a polymolecular mechanism involving the formation of nuclei with various stabilities. Other aspects of the phenomenon are discussed, which probably occur also in the crystallization of the unfractionated polymer.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750620
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