Abstract
The influence of intrachain trans double bonds, statistically distributed along a polyethylene chain, on the structure and behaviour of chain-folded single crystals has been studied. The dependence upon the percentage of double bonds of dissolution and thermal properties, external crystal habit, X-ray diffraction in the wide- and low-angle regions, of solution grown single crystals of ethylene-butadiene copolymers may be interpreted by assuming that a certain amount of CH 2CHCHCH 2 units are incorporated in the lattice as defects. The results of the bromination of single crystals of a sample of ethylene-butadiene copolymers show that about the 56% of double bonds, not accessible to bromine, are situated not on the fold surface but in the inner part of the crystals.
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