Polymer Degradation Mechanisms: Proceedings of the Nbs Semicentennial Symposium on Polymer Degradation Mechanisms Held at the Nbs on September 24-26, 1951 (Classic Reprint) - Softcover

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Excerpt from Polymer Degradation Mechanisms: Proceedings of the Nbs Semicentennial Symposium on Polymer Degradation Mechanisms Held at the Nbs on September 24-26, 1951

Experimental data on the degradation of vinyl polymers are not yet very numerous, but as far as the bulk degradation of these poly mers in vacuum is concerned, the experimental results suggest that degradation usually takes place by a reversal of the polymerization process. This true degradation, or depolymerization, is often obscured by reactions which, in the case of polystyrene, are due to the presence 'of a number of weak links; that is to say, small irregularities in the structure of these polymer chains can profoundly influence the degradation process.

A survey is given in this paper on possible mechanisms of degrada tion, stressing particularly those that have been verified by experiment. Thus a reverse polymerization mechanism is presented in this paper, and also a mechanism is given for simultaneous degradation and polymerization processes leading to an equilibrium state. Recently, Simha and coworkers [1] developed a theory of degradation assuming a chain process. However, the assumptions and derivations in this paper differ in many respects from Simba's. Experimental results are discussed in the light of these theories, especially those obtained on polystyrene, which has been investigated more thoroughly than any other polymer. Subsequently, the effect of benzoyl peroxide and oxygen on the degradation is considered, and lastly, the degra dation of vinyl polymers by ultrasonic waves is discussed.

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