Article
  • Kinetic Studies on Homopolymerization of α-Methylstyrene and Sequential Block Copolymerization of Isobutylene with α-Methylstyrene by Living/Controlled Cationic Polymerization
  • Wu Y, Guo W, Li S, Gong H
  • 리빙/조절 양이온중합에 의한 알파메틸스티렌 호모중합 및 이소부틸렌과의 블록공중합에 대한 반응속도론 연구
  • Wu Y, Guo W, Li S, Gong H
Abstract
The controlled/living cationic polymerization of α-methylstyrene (αMeSt) and sequential block copolymerization of isobutylene (IB) with αMeSt were achieved using 2-chloro-2,4,4-trimethylpentane (TMPCl)/titanium tetrachloride (TiCl4)/titanium isopropoxide (Ti(OiPr)4)/2,6-ditert-butylpyridine (DtBP) initiating system in CH3Cl/hexane (50/50 v/v) solvent mixture at -80 ℃.The polymerization rate decreased with increasing [Ti(OiPr)4]/[TiCl4] ratio in the homopolymerization of αMeSt. The effects of [Ti(OiPr)4]/[TiCl4] ratios and PIB+ molecular weight on the polymerization rate and blocking efficiency were also investigated. Well-defined poly(isobutylene-b-α-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-α-methylstyrene)s of almost 100% were obtained when αMeSt was induced by PIB's of Mn ≥ 41000 at [Ti(OiPr)4]/[TiCl4]=1. Differential scanning calorimetry (DSC) of the block copolymers showed two glass transition temperatures, thereby demonstrating microphase separation.

Keywords: controlled/living carbocationic polymerization; poly(α-methylstyrene); kinetics; poly(isobutylene-b-α-methylstyrene)

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2008; 32(4): 366-371

    Published online Jul 25, 2008

  • Received on Feb 29, 2008
  • Accepted on May 17, 2008