Aliphatic-aromatic copolycarbonates derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol

Autor:	William H. Daly, Carey Cecil Geiger, Jack D. Davies
Rok vydání:	1995
Předmět:	Bisphenol A Polymers and Plastics Bisphenol Chemistry Organic Chemistry Dynamic mechanical analysis Decomposition chemistry.chemical_compound Polymer chemistry Materials Chemistry Copolymer Thermal stability 2 2 4 4-Tetramethyl-1 3-cyclobutanediol Glass transition
Zdroj:	Journal of Polymer Science Part A: Polymer Chemistry. 33:2317-2327
ISSN:	1099-0518 0887-624X
DOI:	10.1002/pola.1995.080331404
Popis:	The synthesis of copolycarbonates with high aliphatic contents for possible applications as optical plastics is described. Copolymers of 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCBD) with a series of 14 bisphenol derivatives were prepared and characterized. The refractive index of these materials varies from 1.49 for the 2,2-hexafluoropropane substituted copolymer to 1.57 for the 9,9-fluorene substituted copolymer ; thus, all of the copolymers exhibit lower refractive indices than the bisphenol A homopolycarbonate. The glass transition temperatures of the copolymers vary from 110 to 210°C ; the beta transition temperatures vary from -70 to 0°C when measured at 10 Hz by dynamic mechanical analysis. The copolymers exhibited good thermal stability (0-3% weight loss) when heated above the glass transition temperature, and only undergo extensive decomposition (80-90%) at 300-360°C. ® 1995 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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