ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Thermal shrinkage of highly hot-drawn and quenched poly(methyl methacrylate) and polycarbonate of bisphenol A were measured. PMMA shows three-step thermal shrinkage under suitable experimental conditions above its glass transition temperature (Tg). Polycarbonate exhibits four kinds of molecular relaxation associated with shrinkage around and above its Tg. The effect of hot-drawing and quenching conditions on shrinking behavior is discussed. Almost all of the molecular relaxations are observed above Tg. The molecular origins of the relaxations are discussed in relation with the so-called T11 transitions of polymers.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1981.070260702
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