Polyfvinyl chloride oxidation

The main progress in the science of ageing and stabilisation of polymers has generally been related to large tonnage carbochain polymers polyolefins, polyfvinyl chloride), rubbers, acrylic polymers. This is a consequence of not only their interest to industry, but also of the existence of fundamental investigations of cracking and oxidation of individual aliphatic compounds. 

Figure 11.26 The relationship between AK and fatigue crack growth rates for poly(methyl methacrylate), PMMA polysulfone, PSF polystyrene, PS polyfvinyl chloride), PVC poly(2,6-dimethyl-1,4-phenylene oxide), PPO polycarbonate, PC nylon 66 and polyfvinylidene fluoride), PVp2 (49). Samples with data to the right are more fatigue resistant than on the left, because they require higher levels of stress at the crack tip to propagate the crack.

Fig. 15. Changes of the glass transition temperature for a series of polymer solutions and an effort to fit the data to equations 42 to 44. [PMMA = poly(methyl methacrylate), PVF2 = poly(vinylidene fluoride), PEG = polyCethylene oxide), PEA = poly(ethylene adipate), PBA = poly(butylene adipate), PVC = polyfvinyl chloride), PCL = poly(e-caprolactone)].

E. A. Hegazy, T. Seguchi and S. Machi. Radiation-induced oxidative degradation of polyfvinyl chloride). J. Appl. Polym. Sci. 26, 1981, 2947. 

The utility of the DSC for studying polymer-polymer miscibility has been demonstrated for poly(vinyl chloride)/nitrile rubber polyfvinyl methyl ether)/poly-styrene and poly(2,6-dimethyl 1,4-diphenylene oxide)/poly(styrene-co-chloro-styrene)It has also been particularly useful for measuring the melting point depressions of crystalline polymers in blends Mn order to calculate the interaction parameter as will be discussed later. 

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