Crystallinity and orientation in silicone rubber. II. Physical measurements
作者:
E. L. Warrick,
期刊:
Journal of Polymer Science
(WILEY Available online 1958)
卷期:
Volume 27,
issue 115
页码: 19-38
ISSN:0022-3832
年代: 1958
DOI:10.1002/pol.1958.1202711502
出版商: Interscience Publishers, Inc.
数据来源: WILEY
摘要:
AbstractDensity data for a silica‐filled dimethylpolysiloxane rubber define incipient crystallization conditions and indicate the forms of crystalline growth for the unstressed rubber and for a sample at 200% elongation. Temperature—tension data for the same silicafilled rubber show incipient crystallinity temperatures as a function of extension. While stress relaxed filled silicone rubber samples show a tension decrease with falling temperatures, they are far from ideal rubbers. The change in polymer filler interaction links with temperature may account for this nonideality. Both the filled and unfilled rubbers show a thermoelastic inversion. The comparison with x‐ray data yields good evidence that crystallization is responsible for the tension rise at low temperatures. This rise may stem from the tendency of silicone rubber to crystallize without altering the orientation of chain segments. The ability to crystallize chain elements in all states of orientation may be founded upon a much greater chain segment mobility for silicone rubber than found with natural rubber. Normal stress—strain curves taken at low temperatures qualitatively show the effects of crystall
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