Thermally Stimulated Current Studies of Transitions in Amorphous Polymers View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1987

AUTHORS

A. Bernes , R. F. Boyer , D. Chatain , C. Lacabanne , J. P. Ibar

ABSTRACT

Thermally Stimulated Current (TSC) studies allow us to investigate the transition spectra of amorphous polymers. The relaxation modes observed around and above the glass transition (Tg) have common features: (1) The TSC peak isolated around Tg corresponds to a distribution of relaxation times following an Arrhenius equation. The width of the distribution characterizes the distribution of the order parameter. (2) The TSC peak observed some 50° above Tg is well described by a Fulcher-Vogel equation. This mode, which can also be distributed, has been associated with the dielectric manifestation of the liquid-liquid transition (Tll).The influence of several parameters on the transition spectra (molecular weight, chemical structure, and metastability) has been followed.Influence of Molecular Weight Polyisobutylene has been taken as an example. For samples of molecular weight Mw > 9,300, the temperature positions of the TSC peaks associated with Tg and Tw are practically constant, as in other “non-flow techniques” such as adiabatic or differential scanning calorimetry. Influence of Chemical Structure Poly(cyclohexyl methacrylate) has been chosen as a model. In this case, the analysis of the Tu peak shows a significant increase in the thermal expansion coefficient. This result is coherent with thermal expansivity data from Simha et al. It is attributed to the bulkiness of the side group resulting in a larger excluded volume. Influence of Meiastability Metasiability has been induced in polystyrene by applying static pressure or “Rheomolding®.” These treatments are accompanied by a spectacular decrease in the T critical temperature. This evolution is indicative of low temperature mobility. More... »

PAGES

305-326

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4613-1867-5_14

DOI

http://dx.doi.org/10.1007/978-1-4613-1867-5_14

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1043846487


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