Synthesis, Characterization and Properties of Octa-Arm Polyisobutylene-Based Star Polymers
作者： Sunny Jacob , Joseph P. Kennedy
关键词: Gel permeation chromatography 、 Polymer chemistry 、 Polymerization 、 Stars 、 Dispersity 、 Thermoplastic elastomer 、 Materials science 、 Cationic polymerization 、 Isobutylene 、 Molecule
摘要: This review concerns the synthesis, characterization, and select properties of a series novel eight-arm polyisobutylene (PIB)-based stars. An octafunctional initiator containing 2-methoxyisopropyl groups 1 was synthesized by quantitative functionalization 5,11, 17,23,29,35,41,47-octaacetyl-49,50,51,52,53,54,55,56-octamethoxy-calix[8]arene used to prepare Stars with PIB arms, terminally functionalized poly(styrene-b-isobutylene) (PSt-b-PIB) poly(p-chlorostyrene-b-isobutylene) (PpClSt-b-PIB) arms were synthesized. Polymerizations isobutylene (IB) well-defined stars effected use octa-functional BCl3-TiCl4 coinitiators in two stages. Stage I carried out presence fraction required amount IB CH3Cl polymerization induced addition BCl3. II TiCl4 balance IB, completion. The relative concentrations BCl3 critical for synthesis By well-chosen concentrations, added sequence stages, narrow dispersity stars, Mw / Mn = 1.11, prepared. Gel permeation chromatography (GPC), on-line RI, UV, laser light scattering (LLS) detectors, determine molecular weights compositions linear octa-arm star polymers. number determined 1H NMR spectroscopy selective core destruction. Both studies indicated that close theoretical value eight. mechanism studied model monofunctional analogue initiator, 2-(p-methoxyphenyl)-2-methoxypropane.
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