Melting behavior of high-temperature polymers

摘要: The melting behavior of three representative semirigid polymers, poly(aryl ether ketone), poly(ethylene terephthalate), and naphthalenate), has been studied. Analysis experimental results indicates that the process is morphologically reverse isothermal crystallization with respect to primary secondary structural elements. On this basis, it hypothesized all polymers occurs in distinct steps, assuming spherulites are composed dominant lamellae subsidiary branches. latter might have originated either from material rejected or noncrystalline molecular sections vicinity lamellae. Experimental emerging differential scanning calorimetry, polarized optical microscopy, small-angle X-ray scattering can be explained terms such a morphology, for which two possible models suggested.