Lactone polymers. VIII. Dynamic mechanical properties of ε-caprolactone and γ-(tert-butyl)-ε-caprolactone copolymers

Autor:	J. V. Koleske, Frank E. Critchfield, C. G. Seefried
Rok vydání:	1976
Předmět:	Tert butyl chemistry.chemical_classification Materials science chemistry Polymer chemistry General Engineering Copolymer Polymer Glass transition ϵ caprolactone Lactone Amorphous solid
Zdroj:	Journal of Polymer Science: Polymer Physics Edition. 14:2011-2017
ISSN:	1542-9385 0098-1273
DOI:	10.1002/pol.1976.180141107
Popis:	The temperature dependencies of dynamic mechanical properties have been determined with a torsional pendulum for copolymers of ϵ-caprolactone and γ-(tert-butyl)-ϵ-caprolactone over the entire composition range. Copolymers containing at least 25 mol % (33 wt %) of γ-(tert-butyl)-ϵ-caprolactone units are amorphous in nature. The experimentally obtained glass transition temperatures of the copolymers and poly(γ-(tert-butyl)-ϵ-caprolactone) were used to calculate the glass transition temperature of amorphous of poly(ϵ-caprolactone) according to the Fox relation. This value of −70°C is in excellent agreement with values obtained from similar calculations based on compatible blends of poly(ϵ-caprolactone) with other homopolymers.
Databáze:	OpenAIRE
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