Ultrahigh molecular weight nonlinear polycarbonates synthesized in microlayers

In Hak Baick, Yuesheng Ye, Carla Vanesa Luciani, Yun Gyong Ahn, Kwang Ho Song, Kyu Yong Choi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Ultrahigh molecular weight bisphenol A polycarbonate (BPAPC) with nonlinear chain structures has been synthesized by solid-state polymerization in microlayers at 230 C. It has been found that the molecular weights of the microlayers of low molecular weight prepolymers with thickness ranging from 5 to 35 μm increased rapidly to ultrahigh molecular weight (300,000-600,000 g/mol) without any discoloration. The amorphous prepolymers exhibited much higher reaction rate than the partially crystallized prepolymers. Although the reactive end group mole ratios of the prepolymers prepared by semibatch melt polycondensation deviated significantly from the stoichiometric value, branching and partial cross-linking reactions have been found to occur to rapidly increase the polymer molecular weight. These nonlinear chain structures observed were due to Fries rearrangement, Kolbe-Schmitt rearrangement reactions, and radical-induced scission/cross-linking reactions. The microstructures of the high molecular weight polymers have been analyzed by 13C NMR, 1H NMR, pyrolysis-gas chromatography mass spectrometry, and atomic force microscopy.

Original languageEnglish
Pages (from-to)17419-17431
Number of pages13
JournalIndustrial and Engineering Chemistry Research
Volume52
Issue number49
DOIs
Publication statusPublished - 2013 Dec 11

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering

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