el-- films of ultrahigh molecular weight polyethylene (UHMWPE) were prepared from tri -- dilute solutions. The films were composed of lamellarcrystals oriented parallel to the film surfaces and could be ultradrawn (λ > 200) at the temperatures ranged from 129℃ to 134℃. When the undrawn films were annealed atthose temperatures

the morphologies in the lamellar crystals had change. WAXDand iR studies shown that the crystallinities incrcand

dimensions in (002) and(020) normals increased while that in (200) fold had slight decreases. The rela-tionship between the orientation of the drawn UHMWPE gel-films and the struc-ture changes and the optimum drawing temperature had been disscussed.