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The effect of cold treatment on the β-relaxation of low density polyethylene

✍ Scribed by P.J. Hendra; C. Passingham; S.A. Jones

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
545 KB
Volume
27
Category
Article
ISSN
0014-3057

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✦ Synopsis

Branched low density polyethylene (LDPE) is known to exhibit a fl-transition around -20 ° due to molecular motion of short side chain branches situated in the interfacial regions of the lamellae. The effect of long periods of cold soaking of LDPE below the fl-transition has been investigated using the techniques of DSC, i.r., dilatometry and Raman active longitudinal acoustic modes. Cold soaking was found to produce an increase in crystallinity on a very small scale. It is suggested that the ordering occurs at the lamellar boundaries from the ordering and subsequent crystallization of short chain branches.

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