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The crystal structure of form III of isotactic poly(4-methyl-1-pentene) is refined with the full-profile X-ray powder diffraction refinement procedure (Rietveld method). chains with 41 helical conformation are packed in a tetragonal unit cell according to the space group I4 1 . In the limit-ordered regions of the crystal every chain is surrounded by four enantiomorphous and isoclined chains...
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