ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The infrared spectra of polyvinyl chloride, polyvinylidene chloride, and their copolymers have been analyzed with the help of group theory and of spectra in the extended range of 70 to 3000 cm.-1. The assignments of the bands have been made with the help of polarized spectra of oriented samples. For both polyvinyl chloride and polyvinylidene chloride the tentative structure suggested by x-ray diffraction studies has been used as a basis for predicting the infrared spectrum of the polymer. In both cases a quite satisfactory interpretation of the spectrum has resulted, thus lending further support to the postulated structures. For each polymer, the group theory analysis is used to obtain selction rules and the distribution of normal modes among the symmetry species. On the basis of approximate separability of group modes, it is possible to analyze in detail the expected hydrogen, chlorine, and skeletal normal modes. Assignments of these frequencies are inferred from this information, knowledge of the region in which the normal frequency is expected to occur, and the polarization properties of the bands. In the case of the skeletal modes, the assignments are based upon recent calculations of the skeletal frequencies expected in long chain molecules.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1956.1202210012
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