Abstract
AbstractExtruded films of linear polyethylene were grafted with styrene in a 1:2 styrene‐‐‐methanol solution and pure styrene. The reaction was induced by simultaneous γ irradiation. Crystallinity of polyethylene was hardly affected by a polystyrene‐to‐polyethylene ratio as high as 13.5. From the anisotropy of film growth and small‐angle x‐ray diffraction it was concluded that polystyrene incorporated both into intercrystalline layers and newly formed domains alongside the stacks of lamellae. The proportion of polystyrene in interlamellar layers depends on the length of grafted chains; that is, on grafting conditions. A higher than expected proportion of occluded homopolystyrene was found in films grafted in methanol solution. The glass transition temperature of polystyrene decreased with grafting yield. Grafting in methanol solution produced changes in the x‐ray orientation pattern of polyethylene. This was ascribed to untwisting and straightening crystalline lamellae in the row nucleated cylindrites.
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