ABA triblock copolymer containing two crystallizable components

A triblock copolymer of the ABA type in which both components were crystallizable was synthesized. The A block was poly(ethylene oxide), PEO, and the B block, poly(dimethyl siloxane), PDMS. Upon cooling from the melt to liquid nitrogen temperature, the PEO block crystallized at around 40°C. When the...

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Bibliographic Details
Published in:Polymers for advanced technologies 1995-06, Vol.6 (6), p.413-417
Main Authors: Shih, Hsiao-Yi, Kuo, Wen Faa, Pearce, E. M., Kwei, T. K.
Format: Article
Language:English
Subjects:
PDMS
PEO
triblock copolymer
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Summary:A triblock copolymer of the ABA type in which both components were crystallizable was synthesized. The A block was poly(ethylene oxide), PEO, and the B block, poly(dimethyl siloxane), PDMS. Upon cooling from the melt to liquid nitrogen temperature, the PEO block crystallized at around 40°C. When the copolymer was heated from −170°C after quenching, glass transition, crystallization and melting of the PDMS middle block were identified in the thermogram at −117°C, −74°C and −42°C, respectively. The degree of crystallinity of the PDMS block was estimated from the heat of fusion to be about 27%. The growth rates of the PEO spherulites were reduced by the presence of the middle block.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.1995.220060605