1,720,983 research outputs found
ENERGETIC FEASIBILITY OF ADJACENT REENTRY CHAIN FOLDING IN CRYSTALS OF ISOTACTIC POLYPROPYLENE
No full textConformational energy calculations for the alpha-form of isotactic polypropylene were carried out for possible adjacent re-entry fold schemes resulting from the inherent directionality of isotatic chains and from examination of the crystalline structure. The calculated fold conformational energy is compatible with the literature values of fold surface free energy
ANALYSIS OF CHAIN FOLDING IN CRYSTALLINE ISOTACTIC POLYPROPYLENE - THE IMPLICATIONS OF TACTICITY ANDCRYSTALLOGRAPHIC SYMMETRY
No full textTacticity and crystallographic considerations are used to predict fold models for a perfect crystal of isotactic polypropylene (α-form). If we assume adjacent re-entry chain folding we conclude that the folding plane must be parallel to the (010) plane. This is in agreement with morphological experimental evidence. We also show that this result is likely to apply even to non-perfect crystals
Crystal Structure of the Clathrate Form of Syndiotactic Poly(m-methylstyrene) Containing Carbon Disulfide.
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Crystal structure of the clathrate form of syndiotactic poly(m-methylstyrene) containing carbon disulfide.
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