A structure of copolymers of propene and hexene isomorphous to isotactic poly(1-butene) form I

Macromolecules

Volumn 39, Issue 17, 2006, Pages 5777-5781

  Lotz, B ^a   Ruan, J ^a   Thierry, A ^a   Alfonso, G C ^b   Hiltner, A ^c   Baer, E ^c   Piorkowska, E ^d   Galeski, A ^d  

^a INSTITUT CHARLES SADRON   (France)

^b UNIVERSITY OF GENOA   (Italy)

^c Case Western Reserve University   (United States)

^d CENTRE OF MOLECULAR AND MACROMOLECULAR STUDIES   (Poland)

Author keywords

[No Author keywords available]

Indexed keywords

CHAIN CONFORMATION; CRYSTAL MODIFICATION; HEXENE CONTENT; ISOTACTIC POLYPROPYLENE;

CONFORMATIONS; CRYSTAL STRUCTURE; CRYSTALLIZATION; MOLECULAR STRUCTURE; POLYPROPYLENES;

COPOLYMERS;

EID: 33748563935     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma052314i     Document Type: Article

References (12)

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5. It should be noted that a similar crystal structure is observed for stereocomplexes formed by racemic blends of chiral molecules (e.g., poly(lactic acid)) that can crystallize in 3-fold helical conformations. The large six-chain trigonal unit-cell of this stereocomplex has been described on the basis of a smaller triclinic unit-cell with two chains only, one right-handed helix and one left-handed helix (Okihara, T. et al. J. Macromol. Sci. Phys. 1991, B30, 119).
6. Whereas this is indeed the smallest possible unit-cell, it does not take advantage of the symmetry elements (3-fold screw axes) that exist in the larger trigonal cell. The trigonal cell is actually the logical unit-cell, and has been used since the early analyses of polyolefin structure analysis: isotactic poly(1-Butene) form I, isotactic polystyrene, etc (cf. for example: Natta, G; Corradini, P.; Bassi, I. W. Nuovo Cimento, Suppl. 1960, 15, 69)
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