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- W1957252394 abstract "The modern story of syndiotactic polypropylene (sPP) starts with the introduction of metallocene catalysts allowing for a large scale production of this polymer. This initiated immediately a large interest in the crystallization behavior of this polymer. Three different chain conformations were reported for crystallized sPP in contrast to iPP where exclusively a 31-helix is observed. A planar zig-zag form (TT)n occurs in the melt or in quenched samples [1]. A second possible chain conformation of a (T6G2T2G2)n type of helix is formed when quenched samples are exposed to solvent vapour [2]. A stable helical conformation with (TTGG)n (s(2/l)2) symmetry is usually formed by highly stereoregular sPP when isothermally crystallized from the melt or when moderately cooled. For this helical conformation, three orthorhombic packing modes were described; a C-centred cell I with the space group C2221 a primitive cell II with antichiral packing of chains along the a-axis (space group Pcaa) and finally a body centred cell III with fully antichiral packing of the chains (space group Ibca) [3] (Figure 1)." @default.
- W1957252394 created "2016-06-24" @default.
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- W1957252394 date "1999-01-01" @default.
- W1957252394 modified "2023-10-14" @default.
- W1957252394 title "Crystallization of syndiotactic polypropylene" @default.
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- W1957252394 doi "https://doi.org/10.1007/978-94-011-4421-6_20" @default.
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