ISSN:
0449-2978
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The crystal structure of poly(m-xylylene adipamide) was reinvestigated by x-ray diffraction. It is found that the helical chain model proposed by Yoda et al. needs to be corrected to a large extent. The unit cell obtained is triclinic with dimensions a = 12.01 A., b = 4.83 A., c = 29.8 A. (fiber axis), α = 75.0° = 26.0°, and γ = 65.0°, in which one molecular chain with two chemical repeating units is involved. The space group is C1i-P1. An almost planar zigzag chain conformation with a small degree of contraction from the original planar arrangement is given. The CH2 planar zigzag chain and the aromatic rings are so oriented that their planes are inclined to the c axis at an angle of a few degrees. The hydrogen-bonded sheets nearly coincide with the (100) plane and the aromatic rings are close to the (120) plane, which is nearly perpendicular to the direction of hydrogen bonding.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1966.160040611
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