Author/Editor		Strauch, V; Schara, M
Title		E.p.r. study of the orientation of polymer segments induced by cold drawing of a low density polyethylene
Type		članek
Source		Polymer
Vol. and No.		Letnik 36, št. 18
Publication year		1995
Volume		str. 3435-8
Language		eng
Abstract		The orientation of low desity polyethylene (LDPE) chain segments induced by cold drawing was determined by electron paramagnetic resonance spectra measured for samples probed by tempyl stearate or alkyl radicals formed by gama-irradiation. We characterized the induced orientation in the amorphous phase using a two-a=dimensional Gassian distribution function (delta = 12 degrees), axially symmetrical about the draw direction. A simultaneously induced alignment of the crystallite c-axes with the draw direction, accompanied by a random orientation of the crystallite a-aaxes and b-axes, was also observed. We proposethat the molecular morphology of cold-drawn LDPE can be described in terms of specifically oriented crystallites emanating chain segments packed in the condis state.
Descriptors		POLYETHYLENES CRYSTALLOGRAPHY ELECTRON SPIN RESONANCE SPECTROSCOPY MODELS, MOLECULAR TEMPERATURE