Novel amorphous perfluorocopolymeric system: Copolymers of perfluoro-2-methylene-1,3-dioxolane derivatives

Y. U. Yang, František Mikeš, Liang Yang, Weihong Liu, Yasuhiro Koike, Yoshiyuki Okamoto

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Perfluorotetrahydro-2-methylene-furo[3,4-d][1,3]dioxole (monomer I) and perfluoro-2-methylene-4-methoxymethyl-l,3-dioxolane (monomer II) are soluble in perfluorinated or partially fluorinated solvents and readily polymerize in solution or in bulk when initiated by a free-radical initiator, perfluorodibenzoyl peroxide. The copolymerization parameters have been determined with in situ 19F NMR measurements. The copolymerization reactivity ratios are r I = 1.80 and r II = 0.80 in 1,1,2-trichlorotrifluoroethane at 41°C and r I = 0.97 and r II = 0.85 for the bulk polymerization. These data show that this copolymerization pair has a good copolymerization tendency and yields nearly ideal random copolymers. The copolymers have only one glass-transition temperature from 101 to 168°C, depending on the copolymer compositions. Melting endotherms have not been observed in their differential scanning calorimetry traces, and this indicates that all the copolymers with different compositions are completely amorphous. These copolymers are thermally stable (the initial decomposition temperatures are higher than 350°C under an N 2 atmosphere) and have low refractive indices and high optical transparency from UV to near-infrared. Copolymer films prepared by casting were flexible and tough. These properties make the copolymers ideal candidates as optical and electrical materials.

Original languageEnglish
Pages (from-to)1613-1618
Number of pages6
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume44
Issue number5
DOIs
Publication statusPublished - 2006 Mar 1

Keywords

  • Amorphous
  • Chemical
  • Copolymer
  • Perfluoropolymer
  • Thermal stable
  • Transparent

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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