Dynamics of structurally disordered poly(vinyl chloride)
✍ Scribed by A. Rubcic; G. Zerbi
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 391 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Following OUT previous studies on poly(viny1 chloride) the im1uenc-e of the existen= of head-t&4 defects on the vi-Srationzl properties and on the vibrariod spectra of syndiotactic planar zig-zag holy (vinyl chloride) has been studied. The dynarnid aspects and the spectroscopic consequenrzs of the existen-of such _ q kind of defects in an otherwise structurtiy regular polymer chain are discussed and some comments are made on the we of frequency correlations from model compounds for the interpretation of the infrared and Raman spectra of polymers. The dependency of a few characteristic fre quencies on chain length is discussed.
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The semiempirical method proposed by Vedeneyev was used to stud? the (7 CI, (" H and C--C bonds in poly(vinyl chloride). Activation energies for elimination of hydrogen chloride were calculated on the principle of the additivit3 of bond energies of the four-membered activated complex, for various sa
A poly(viny1 chloride) (PVC)/poly(methyl methacrylate) (PMMA) (80/20 w/w) polymer blend was studied by mechanical spectroscopy. Two relaxations can be distinguished in the glassy state, a very large secondary relaxation in the range of 100 K to 325 K which results from the combination of secondary r
Vinyl chloride/acetylene copolymers have been prepared under subsaturation conditions. Copolymerization rates and molecular weights of the copolymers decrease with increasing concentration of acetylene in the monomer feed, indicating that acetylene is a retarder in vinyl chloride polymerization. The