Films of ultrahigh-molecular-weight (3 ? 10 6) polyethylene were produced by gelation/crystallization at various temperatures from dilute decalin solutions according to the method of Smith and Lemstra. The temperatures chosen were 20, 30, 50 and 70°C. With increasing temperature, the long period and crystallinity of the resultant gel film increased. By contrast, when the films were stretched up to 300 times, the increases in Young's modulus, crystallinity and molecular orientation become more significant as the temperature ofgelation/crystallization become lower. This interesting phenomenon is thought to be due to the dependence of the number of entanglement meshes on the temperatures of gelation/crystallization and evaporation of solvent from the gel to form a film
Посилання на статтю:
Morphology and mechanical properties of ultrahigh-molecular-weight polyethylene prepared by gelation/crystallization at various temperatures / Tetsuya Ogita, Nobuyasu Suzuki and Yoshihisa Kawahara // Polymer. – 1992. – Vol 33. – P. 698-702.