Polyamides with a choice of structure and crystal surface chemistry. Studies of chain-folded lamellae of nylons 8 10 and 10 12 and comparison with the other 2N 2(N + 1) nylons 4 6 and 6 8

Macromolecules

Volumn 30, Issue 12, 1997, Pages 3569-3578

  Jones, N A ^a   Atkins, E D T ^a   Hill, M J ^a   Cooper, S J ^a   Franco, L ^a  

^a UNIVERSITY OF BRISTOL   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTAL GROWTH; CRYSTAL STRUCTURE; CRYSTALLIZATION; HYDROGEN BONDS; MACROMOLECULES; MELTING;

CHAIN FOLDING; POLYMER LAMELLAE;

NYLON POLYMERS;

EID: 0031166056     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma961494g     Document Type: Article

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26. In 2N 2(N + 1) Nylons, the folds in p-sheets must contain an odd number of alkane segments to meet the straight-stem registration criteria on adjacent re-entry For the Nylons we have studied in this paper, one alkane segment is sufficient to make the fold. However, if the alkane segments are short, e.g. Nylon 2 4, then the folds might contain three alkane segmente, similar to the γ-turns recently discovered in chainfolded lamellae of polypeptides (Panitch, A.; Matsuki, K.; Cantor, E. J.; Cooper, S. J.; Atkins, E. D. T.; Fournier, M. J.; Mason, T. L.; Tirrell, D. A. Macromolecules 1997, 30, 42. Krejchi, M. T.; Cooper, S. J.; Deguchi, Y.; Atkins, E. D. T.; Fournier, M. J.; Mason, T. L. Tirrell, D. A. Macromolecules, in press). The folds in a-sheets must contain (sections of) both diamine alkane and diacid alkane segmenta. Since these alkane segments are of equal length, the amide group is positioned at the apex of the chain fold.
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