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
Filter
  • Articles  (32)
  • Other Sources
  • 1980-1984  (32)
  • 1
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (Inifers) (1981)
    Springer
    Polymer bulletin 5 (1981), S. 379-384 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary This paper concerns the synthesis and characterization of new Si-Cl and Si-H end-groups containing polyisobutylenes. The syntheses involved 1) The preparation of polyisobutylenes carrying one or two -CH2C-(CH3)=CH2 termini, ii) Hydrosilylation with H(CH3)2-SiCl, H(CH3)SiCl2, and HSiCl3, and iii) Reduction of the Si-Cl groups to yield the corresponding -Si-H termini. A series of model compounds mimicking the end-groups have been synthesized and employed for end-group characterization. These Si-Cl and Si-H containing mono- and difunctional polyisobutylenes may be useful intermediates for the preparation of block and graft copolymers or for the synthesis of various terminal functional groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282687
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cationic modifications of polychloroprene (1982)
    Springer
    Polymer bulletin 7 (1982), S. 337-344 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The synthesis of the novel graft-block copolymer poly[chloroprene-g-(isobutylene-b-α-methylstyrene)], i.e., a polychloroprene backbone carrying isobutylene/α-methylstyrene block copolymer branches, is described. The synthesis was accomplished by exploiting detailed insight into the mechanisms of initiation of isobutylene and α-methylstyrene polymerization, and termination of isobutylene polymerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00254288
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (Inifers) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 551-555 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary α, ω-Di(hydroxy)polyisobutylene was converted to the corresponding α,ω-di(allylether)- and α,ω-di(allylphthalyl)polyisobutylene by reacting the diol with allyl bromide in the presence of alkali and tetrabutylammonium bisulfate phase transfer catalyst, and monoallyl phthalic acid chloride in the presence of 4-N,N-dimethylaminopyridine, respectively. The reaction conditions were defined by suitable model experiments. IR and 1H-NMR analysis of the reaction products indicates quantitative conversions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262934
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (Inifers) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 563-570 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The synthesis and quantitative end group characterization of bisphenol- and trisphenol-polyisobutylenes are described. These new telechelic prepolymers consist of a linear or a threearm star polyisobutylene (PIB) carrying exactly two or three phenol termini, respectively. The syntheses were accomplished by quantitative Friedel-Crafts alkylation of phenol by olefin- and/or tert.-chlorine-telechelic PIB's and characterization involved 1H NMR, UV and GPC techniques. These materials combine the chemical versatility of the- C(CH3)2C6H4OH end group with the attractive physical-chemical properties of the rubbery PIB chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262936
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Macromers by carbocationic polymerization (1982)
    Springer
    Polymer bulletin 8 (1982), S. 63-67 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The validity of the copolymer composition equation for the copolymerization of macromers with small monomers for the preparation of graft copolymers has been examined. The reactivity ratios of high molecular weight macromers r1 cannot be determined experimentally with sufficient accuracy whereas those of small monomers r2 may be calculated by r2=ln(1-p2)/ ln(1-p1), where p1 and p2 are the respective conversions of the macromer and small monomer. A single experimental datum obtained even at high conversions may be used. The error of the method can be readily calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (INIFERS) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 319-324 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Linear and three-arm star hydroxy-telechelic polyisobutylenes have been quantitatively esterified with pyromellitic dianhydide in the presence of 4-N,N′-dimethylaminopyridine in tetrahydrofuran at room temperature. Chain extension occurred only under reflux conditions (67°C). In the presence of chromium acetyl acetonate catalyst at 140°C insoluble networks were obtained within minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264920
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (inifers) (1983)
    Springer
    Polymer bulletin 9 (1983), S. 570-576 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The synthesis and characterization of linear telechelic polyisobutylenes having propargyl ether, propargyl ester and propiolic ester end groups are described. The syntheses were accomplished by reacting α, ω-di (hydroxy)-polyisobutylene with propargyl bromide or phthalic anhydride followed by propargylic alcohol or monopropargylic ester of phthalic acid chloride, or propiolic acid in the presence of different catalysts at room temperature (see Scheme 2). According to IR and 1H-NMR analyses quantitative conversions were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Synthesis, characterization and diels-alder extension of cyclopentadiene telechelic polyisobutylene (1983)
    Springer
    Polymer bulletin 9 (1983), S. 268-275 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The use of 1-chlorodicyclopentadiene (DCp-Cl) as a minifer for the polymerization of isobutylene leading to asymmetric telechelic polymers having dicyclopentadienyl head groups and t-chloro tail groups, has been investigated. BCl3 is ineffective, however, diethylaluminum chloride was found to be a suitable coinitiator for the polymerization. According to kinetic investigations chain transfer to monomer is absent and DCp-Cl is an efficient minifer. Polymer characterization indicated a DCp functionality close to 1.0. The t-chloro functionality was 0.27, probably due to side reactions of the t-chloro group with the strong Lewis acids formed during the polymerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262718
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Silica grafted polyisobutylene and butyl rubber (1982)
    Springer
    Polymer bulletin 6 (1982), S. 401-407 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Silica surfaces have been modified by reaction with Cl-Si(CH3)2-CH2-CH2-C6H4-CH2Cl and the modified solids were subsequently used in conjunction with Et2AlCl or AlMe3 coinitiators to initiate the surface graft copolymerization of isobutylene-isoprene mixtures. The experimental conditions have been chosen such that the composition of the rubbery component of the surface-graft be close to that of commercial butyl rubber. The overall composition of silica-grafted butyl rubbers have been characterized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00959850
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Polyisobutylene model elastomers prepared using demonstrably complete end-linking reactions (1983)
    Springer
    Polymer bulletin 9 (1983), S. 375-381 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Linear polyisobutylene (PIB) molecules with either hydroxyl or isopropenyl groups at the chain ends were prepared using cationic polymerizations with bifunctional initiator-chain transfer agents. Extensive spectroscopic analyses confirmed the essentially perfect difunctionality of the two types of polymers. The former polymers were end-linked using an aromatic triisocyanate, and the latter by means of a tetrafunctional silane. The resulting trifunctional and tetrafunctional model PIB networks were found to have absolutely negligible sol fractions, which demonstrates that the end-linking reactions used to prepare them were essentially complete. The networks were studied with regard to their equilibrium stress-strain isotherms in uniaxial extension at 25 °C. The results thus obtained are in satisfactory agreement with theory and yield no evidence whatever for significant elastic contributions from inter-chain entanglements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265316
    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...