The effect of crystallinity on chain mobility and free volume in the amorphous regions of a miscible polycarbonate/polyester blend

M. D. Zipper; G. P. Simon; P. Cherry; A. J. Hill

doi:10.1002/polb.1994.090320711

The effect of crystallinity on chain mobility and free volume in the amorphous regions of a miscible polycarbonate/polyester blend

M. D. Zipper, G. P. Simon, P. Cherry, A. J. Hill

Research output: Contribution to journal › Article › Research › peer-review

43 Citations (Scopus)

Abstract

Homopolymers and blends of polycarbonate/ThermX have been investigated by differential scanning calorimetry, dynamic mechanical analysis, density measurements, and positron annihilation lifetime spectroscopy. The study focuses on the chain mobility and free volume in the amorphous miscible regions of the blends and how this mobility and free volume are affected by increasing crystallinity. It is proposed that judicious annealing, which results in increasing crystallinity (while avoiding ageing or transesterification), induces a constraint on the amorphous region leading to an increase in T_g and coalescence of free volume sites. © 1994 John Wiley & Sons, Inc.

Original language	English
Pages (from-to)	1237-1247
Number of pages	11
Journal	Journal of Polymer Science, Part B: Polymer Physics
Volume	32
Issue number	7
DOIs	https://doi.org/10.1002/polb.1994.090320711
Publication status	Published - 1 Jan 1994

Keywords

free volume
miscible blends
Polycarbonate
positron lifetimes
semicrystalline polyester
ThermX

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10.1002/polb.1994.090320711

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abstract = "Homopolymers and blends of polycarbonate/ThermX have been investigated by differential scanning calorimetry, dynamic mechanical analysis, density measurements, and positron annihilation lifetime spectroscopy. The study focuses on the chain mobility and free volume in the amorphous miscible regions of the blends and how this mobility and free volume are affected by increasing crystallinity. It is proposed that judicious annealing, which results in increasing crystallinity (while avoiding ageing or transesterification), induces a constraint on the amorphous region leading to an increase in Tg and coalescence of free volume sites. {\textcopyright} 1994 John Wiley & Sons, Inc.",

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AU - Hill, A. J.

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AB - Homopolymers and blends of polycarbonate/ThermX have been investigated by differential scanning calorimetry, dynamic mechanical analysis, density measurements, and positron annihilation lifetime spectroscopy. The study focuses on the chain mobility and free volume in the amorphous miscible regions of the blends and how this mobility and free volume are affected by increasing crystallinity. It is proposed that judicious annealing, which results in increasing crystallinity (while avoiding ageing or transesterification), induces a constraint on the amorphous region leading to an increase in Tg and coalescence of free volume sites. © 1994 John Wiley & Sons, Inc.

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KW - miscible blends

KW - Polycarbonate

KW - positron lifetimes

KW - semicrystalline polyester

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The effect of crystallinity on chain mobility and free volume in the amorphous regions of a miscible polycarbonate/polyester blend

Abstract

Keywords

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