ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The chlorination of poly(vinyl chloride) takes place preferentially at the methylenic carbon, leading to 1,2-dichloroethylenic units, and to a lower extent at the methynic, leading to 1,1-dichloroethylenic units. The ratio between 1,2- and 1,1-dichloroethylenic units tends to decrease with increasing degree of chlorination, and it seems to depend also on the chlorination conditions. The number-average sequence length of 1,2-dichloroethylenic units does not differ significantly from 1 during a great part of the process, substantially in agreement with a random distribution of these units along the chain. The 1,1-dichloroethylenic units can be found either between two unchlorinated units or at one end of a sequence of chlorinated units. Since among the unchlorinated units more racemic units are present than expected for a completely random chlorination, it can be suggested either that chlorination is affected by stereoregularity or that it does not take place in the crystalline regions of the polymer.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1969.070130603
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