Abstract
The Selective removal of Chain Defects (branches, unsaturations) by nitric acid from melt crystallized polyethylene is examined with reference to the question of the distribution of defects between crystalline and “amorphous” domains. The results obtained using the IR methyl band at 1376 cm−1 together with weight-loss measurements support the view that the majority of defects, which are situated in the non-crystalline regions, are selectively digested by the nitric acid attack. After removal of the non-crystalline phase the small remaining branch content located within the crystal cores confirms the levels of defect inclusion previously derived from unit cell expansion data.
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