ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
An investigation into the nature of the structural and molecular changes during the bulk oxidation of polystyrene has been conducted by light-scattering and viscometric methods. Oxidations were conducted on films in an air oven at 0, 2, 4, and 5 hr. at 200°C. The oxidized films were dissolved and various parameters obtained on the resulting solutions. Fractionation of unoxidized and oxidized thermally polymerized polystyrene showed a narrowing of the molecular weight distribution during oxidation. The weight-average molecular weight decreased from 1,090,000 to 33,000. That of an unfractionated commercial polystyrene, Styron 683K, decreased from 281,000 to 16,000. These results show that random chain scission of oxidize polymer occurs along with the formation of carbonyl groups giving polymer molecules of shorter chain length most of which probably retain the initial linear random coil structure. In addition to the chain scission, branching and crosslinking are indicated by the distortion of Zimm plots by microgel.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020318
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