摘要:

Di-, tri-, and tristar block copolymers consisting of rubbery poly(isobutylene) (PIB) and glassy poly(α-methylstyrene) (PαMeSt) sequences have been synthesized with 70 to > 95% efficiency. The syntheses involved initiation of α-methylstyrene polymerization by linear or three-arm star PIB's carrying 1,2, or 3 tertiary chlorine termini in conjunction with SnCl4coinitiator in the presence of 2,6-di-tert-butylpyridine (DtBP). Blocking efficiencies (Beff.) increased with the amount of DtBP and approached 100% under suitable conditions.

ISSN:0022-233X    

DOI:10.1080/00222338208056662

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The findings presented in the preceding articles of this special issue have been organized, analyzed, and summarized. Commonalities among the various polymerization systems investigated in detail have been identified and phenomena of general validity were found. Increased insight into the mechanism of initiation and chain transfer processes led to the development of a comprehensive kinetic model which was used to describe the assembled data. Excellent quantitative agreement between experimental and calculated data indicates the validity of the mechanistic/kinetic model developed from chemical principles in regard to fast-initiated nonstationary carbocationic polymerizations in the absence and presence of proton traps.

ISSN:0022-233X    

DOI:10.1080/00222338208056663

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0022-233X    

DOI:10.1080/00222338208056651

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor