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 2,6-Dimethoxy-2,4,4,6-tetramethylheptane (TMHDiOMe) in conjunction with BCl3 has been found to be an efficient linear bifunctional aliphatic initiator for the living carbocationic polymerization of isobutylene in CH2Cl2 or CH3C1 solvents at −30°C (using both the IMA and AMI techniques) and in CH2Cl2 at −10°C (using AMI). The living nature of the polymerization was demonstrated by linear ¯Mn versus amount of PIB formed (WPIB) plots starting at the origin, i.e., DPn obeyed [IB]/ [TMHDiOMe·BCl3]. The molecular weight distributions of polyisobutylenes (PIB) synthesized at −30°C in CH2Cl2 were narrower (1.3–2.0) than those synthesized at −10°C in CH2Cl2(1.7–1.9). Forced termination by quenching with methanol produces α, Ω- tert.-chlorine capped telechelic. PIBs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00285352
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