Deconvolution of the excess heat capacity of the Brill transition in nylon 66

Deconvolution of the excess heat capacity of the Brill transition in nylon 66

The Brill transition in nylon 66, crystallized from solution, is a small, diffuse endotherm extending between roughly 130-230 deg C. The excess heat capacity in this region has been deconvoluted using established methods of statistical mechanics. As have been found for the unfolding transitions in s...

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Veröffentlicht in:Macromolecules 1989-04, Vol.22 (4), p.2000-2003
1. Verfasser: Starkweather, Howard W
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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container_end_page 2003
container_issue 4
container_start_page 2000
container_title Macromolecules
container_volume 22
creator Starkweather, Howard W
description The Brill transition in nylon 66, crystallized from solution, is a small, diffuse endotherm extending between roughly 130-230 deg C. The excess heat capacity in this region has been deconvoluted using established methods of statistical mechanics. As have been found for the unfolding transitions in several globular proteins, the data can be characterized by a model having two energy states within 5% of their fractions. The transition appears to involve a mass corresponding to approx 25 chemical repeat units or about five stems in a folded-chain crystal. This is much smaller than the size of the crystals calculated from small- and wide-angle X-ray data. Spectra, graphs. 9 ref.--AA
doi_str_mv 10.1021/ma00194a079
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
title Deconvolution of the excess heat capacity of the Brill transition in nylon 66
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