ISSN:
1436-2449
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00285352
