| 5 | Phase Transitions and Structures of Poly(ethylene-co-chlorotrifluoroethylene)显示文摘Poly(ethylene- co -chlorotrifluoroethylene) with a 1∶1 molar ratio of ethylene and chlorotrifluoroethylene in composition, PECTFE, is a statistically alternating copolymer widely used in cable coating industry. PECTFE has been commonly characterized as a semicrystalline polymer with crystals melting at 238 ℃. Differential scanning calorimetry, thermal mechanical analysis and dynamic mechanical analysis indicated that PECTFE undergoes a reversible solid-solid transition during cooling and heating in the temperature range between 100 ℃ and 200 ℃. Based on detailed structural analysis via wide angle X-ray diffraction and electron diffraction techniques, we proposed that PECTFE possesses a hexagonal phase above 200 ℃( a =0 60 nm, c =0 49 nm) and an orthorhombic phase( a =0 99 nm, b =0 57 nm, c =0 49 nm) at room temperature. | J.M.DEITZEL, Bojie WANG, Ping HUANG, L.Lawrence CHAPOY, Stephen Z.D.CHENG * (The Maurice Morton Institute and Department of Polymer Science, The University of Akron,Akron Ohio 44325-3909,U.S.A.) Dedicated to the Occasion of the 80th Birthday of P | 2001 | 应用化学2001，18，5： | 1 |
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