Simultaneous Measurement of Glass-Transition Temperature and Crystallinity of As-Prepared Polymeric Films from Restitution

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The glass-transition temperature (T-g) and degree of crystallinity (x(C)) are important properties of polymers. However, for some polymers, current techniques have some difficulties in measuring T-g and X-c, particularly for as-prepared films without damage. Here, we develop a new technique to simultaneously determine T-g and X-c by measuring the restitution of a ball on an intact polymer film or sheet as a function of temperature. Demonstrating with eight different types of polymers, we show that T-g is the onset of the decrease in restitution, and X-c is the minimum restitution for semi-crystalline polymers with X-c up to 50%. Our simple yet versatile technique could provide a useful tool to measure challenging T-g and X-c of films and sheets by the conventional methods.
Publisher
AMER CHEMICAL SOC
Issue Date
2021-10
Language
English
Article Type
Article
Citation

MACROMOLECULES, v.54, no.20, pp.9532 - 9541

ISSN
0024-9297
DOI
10.1021/acs.macromol.1c01477
URI
http://hdl.handle.net/10203/289213
Appears in Collection
CH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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