Degradation of Vinyl Polymers

The exothermic heat of reaction for PVC is relatively high, and thus so is the ceiling temperature. PVC resins, however, will dehydrohalogenate at temperatures considerably lower than the ceiling temperature, forming FICl gas and charred material. In this case, thermal degradation reactions occur at temperatures less than the ceiling temperature. 

As Introduced previously, the compounds in stabilizer packages are consumed with time and thus they will be eventually depleted. As expected, the consumption rate will depend on the temperature and residence times for the resin. Thus, it is important to minimize the number of recycles for a product stream and excessively high temperatures in the extruder. For example, LLDPE resin produced using a 

Rodriguez, R, Principles of Polymer Systems, 4 ed., Taylor Francis, Washington, DC (1996) 

Rodriguez, F., Cohen, C., Ober, C. K., and Arcer, L. A., Principles of Polymer Systems, S ed., Taylor Francis, Washington, DC (2003) 

Walker, R, Trends in Manufacturing Polymers Achieving High Performance in a Multi-Polar World, Accenture (2009) 

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Jellinek, H.H.G., "Degradation of Vinyl Polymers", Academic Press, New York, 1955. 

Jelinek, H. H. G., Degradation of Vinyl Polymers, Academic, New York,... 

Apparently, mammals do not pcKsess any enzymes capable of the degradation of vinyl polymers. Two weeks after the injection, polyvinyl analogs from liver and spleen were compared with the original sample distribution of molecular weights was found identical whithin the limits of experimental error ... 

The two kinetic models that effectively correlate data for the degradation of vinyl polymers were developed on the basis of the zipper mechanism and differ only in the approximations used to account for the premature termination of zip chains. Although the equations are complex in appearance (3), they are based on the relatively simple assumptions of the zipper mechanism. Chains are initiated as a certain fraction of chains per second, k., and unzip at a certain fraction of a started chain per second, R.. 

Jellinek, H. H. Degradation of vinyl polymers. New York Academic Press 1955. 

L. Reich and S. Stivala, Elements of Polymer Degradation, McGraw-Hill, New York, 1971. H. H. G. Jellinek, Degradation of Vinyl Polymers, Academic Press, New York, 1955. 

Matsuinura, S. etal, (1985) Degradability of Vinyl Polymers. Yukagaku, 35, 167. 

Swift, G. and %instein, B. (1993) Degradation of Vinyl Polymers. US Patent 5191048 (to Rohm and Haas). 

Johnson, W. R. and Price, C. C., Shear degradation of vinyl polymers in dilute solution by high speed stirring, J. Polym. Sci. 45 211 (1960). 

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