Electronic Resource
New York
:
Wiley-Blackwell
Journal of Polymer Science Part A: General Papers
2 (1964), S. 2283-2295
ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The mechanism of the α-γ transition of nylon 6 due to iodine treatment and the structure of the γ-form of nylon 6 are discussed on the basis of results of x-ray diffraction and polarized micro-infrared absorption measurements on doubly oriented and iodine-treated specimens. The plane of the amide group and that of the methylene group are both parallel to the rolled plane, which is parallel to the hydrogen-bonded molecular sheet in the α-form of nylon 6. The plane of the amide group is preferentially twisted to a direction roughly perpendicular to the rolled plane on coordination of iodine to the oxygen of the amide group and this preferential orientation of the amide group is retained on the removal of iodine. The preferential orientation of the amide group in the molecule supports the pleated sheet structure proposed by Kinoshita for the γ-form of polyamides. Infrared bands are examined, the preferential orientation of the amide group being taken into account. The structure of the γ-form of nylon 6 is composed of pleated sheets of similarly directed molecular chains joined by hydrogen bonds between the adjacent molecules and in such a packing of sheets the directions of molecular chains are alternately inverse along the direction of stacking of sheets.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020520
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