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- W2296924076 abstract "Crystallization and melting processes are analyzed for polypropylenes having broad or narrow molecular weight distribution and heterogeneous or homogeneous defect composition. The difference in melting temperatures, after rapid crystallization conditions, is related to the difference in chain structure and defects composition while after prolonged crystallizations at very high temperatures the high T{sub m} peak approaches the same value ({approx} 185{degrees}C) for both type of polypropylenes. Only the longest pure isotactic sequences crystallize at this temperature. No {beta} phase is formed when crystallizing from the isotropic melt any of the polypropylenes studied. The {gamma} phase appears as a consequence of the presence of defects in the chain and is favored at the high crystallization temperatures. The origin of the double endotherm from isothermally formed crystals is independent of the formation of either {alpha} or {gamma} crystals and it is interpreted as the result of a copolymeric sequence selection during the crystallization process." @default.
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- W2296924076 date "1995-12-01" @default.
- W2296924076 modified "2023-09-23" @default.
- W2296924076 title "The crystallization and melting behavior of polypropylenes from different catalyst systems" @default.
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