Abstract
AbstractThe structure of crystals of random ethylene‐propylene and ethylene‐butene copolymers has been investigated using fuming nitric acid. This paper is concerned with the effect of nitric acid on crystals grown from a series of copolymers. The weight losses and changes in long period, heats of fusion and unit cell spacings which result from acid treatment are reported. From these results and using the results reported in the earlier papers of this series it is concluded that crystals grown from both ethylene‐propylene and ethylene‐butene copolymers are very similar in structure to linear polyethylene single crystals apart from the fact that branches are contained within the crystalline cores of the copolymer crystals. It is shown that there are some differences between the way that ethylene‐butene and ethylenepropylene crystals are attacked by nitric acid, and a possible reason for this is suggested.
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