[KSCI] Korea Science Citation Index Service

Kinetic Studies on Homopolymerization of $\alpha$ -Methylstyrene and Sequential Block Copolymerization of Isobutylene with $\alpha$ -Methylstyrene by Living/Controlled Cationic Polymerization

Wu, Yibo (College of Material Science and Engineering, Beijing University of Chemical Technology)
Guo, Wenli (Department of Material Science and Engineering, Beijing Institute of Petrochemical Technology)
Li, Shuxin (Department of Material Science and Engineering, Beijing Institute of Petrochemical Technology)
Gong, Huiqing (College of Material Science and Engineering, Beijing University of Chemical Technology)

Publication Information

Polymer(Korea) / v.32, no.4, 2008 , pp. 366-371 More about this Journal

Abstract

The controlled/living cationic polymerization of $\alpha$ -methylstyrene ( ${\alpha}MeSt$ ) and sequential block copolymerization of isobutylene (IB) with ${\alpha}MeSt$ were achieved using 2-chloro-2,4,4-trimethylpentane (TMPCl)/titanium tetrachloride ( $TiCl_4$ )/titanium isopropoxide ( $Ti(OiPr)_4$ )/2,6-ditert-butylpyridine (DtBP) initiating system in $CH_3Cl$ /hexane(50/50 v/v) solvent mixture at $-80^{\circ}C$ . The polymerization rate decreased with increasing $[Ti(OiPr)_4]/[TiCl_4]$ ratio in the homopolymerization of ${\alpha}MeSt$ . The effects of $[Ti(OiPr)_4]/[TiCl_4]$ ratios and $PIB^+$ molecular weight on the polymerization rate and blocking efficiency were also investigated. Well-defined poly(isobutylene-b- $\alpha$ -methylstyrene)s were demonstrated by $^1H$ -NMR and triple detection SEC; refractive index (RI), multiangle laser light scattering (MALLS) and ultraviolet (UV) detectors. Blocking efficiencies for the poly(isobutylene-b- $\alpha$ -methylstyrene)s of almost 100% were obtained when ${\alpha}MeSt$ was induced by PIB's of $M_n\;{\geq}\;41000$ at $[Ti(OiPr)_4]/[TiCl_4]=1$ . Differential scanning calorimetry (DSC) of the block copolymers showed two glass transition temperatures, thereby demonstrating microphase separation.

Keywords

controlled/living carbocationic polymerization; poly( $\alpha$ -methylstyrene); kinetics; poly(isobutylene-b- $\alpha$ -methylstyrene);

Citations & Related Records

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