Solution crystallization of metallocene short chain branched polyethylene:Morphology and mechanism

Solution crystallization of metallocene short chain branched polyethylene ( SCBPE) was carried out and very nice single crystals were obtained. Compare d with single crystals grown from linear polyethylene, SCBPE single crystal s are dirty due to intermolecular heterogeneity The crystal morphology chan ges with crystallization temperatures. Lozenge, truncated lozenge, hexagona l, rounded and elongated crystal morphologies have been found at much lower crystallization temperature than in linear polyethylene. The electron diff raction shows there is a possibility that the single crystals may have hexa gonal packing in a crystallization temperature range. The lateral habits of single crystal are discussed based on roughening theories.