Synthesis Of Isobutylene-based Polymers And Functional Group Polymer By Cationic Polymerization

In this study, a series of multiarm star-branched polyisobutylenes were synthesized by the "arm-first, core-last" method, via living carbocationic polymerization using the TMPCl/TiCl4initiating system and divinylbenzene (DVB) as core-forming comonomer. The effects on star development of arm molecular weight and DVB concentration were studied. Then, multifunctional Poly(St-IP-St) was synthesized in the present of n-BuLi as initiator, THF is used as polar modifier. The effects of St-IP-St’s microstructure and the dosage were studied. GPC/RI/static light-scattering analyses indicates that the polymer produced has a bimodal molecular weight distribution with a high molecular weight branched mode and a low molecular weight linear component. The index v was less then0.5which confirmed the polymer has branched molecular structure. GPC/UV detection indicates that Poly(St-IP-St) chains have successfully grafted on the star-shaped polymers. At last, a monomer which could be used in cationic polymerization was synthesized. GPC、IR、1H-NMR detection indicates functional group polymer was successfully synthesized.