PVC Technology by W. V. Titow M. Phil., Ph.D., C. Chem., F.R.S.C., F.P.R.I.,

By W. V. Titow M. Phil., Ph.D., C. Chem., F.R.S.C., F.P.R.I., C. Text., A.T.I. (auth.)

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The letters iPVC are sometimes used to designate a high-impact compound. i introduction 3 the plastics industry the term 'vinyl' is firmly associated with PVC, in the way just mentioned. A few other relevant standard definitions may be noted in passing. Vinyl chloride plastic: 'A plastic based on polymers of vinyl chloride or copolymers of vinyl chloride with other monomers, the vinyl chloride being in the greatest amount by mass'. (ISO 472-1979). Rigid PVC compounds: 'Rigid plastic compounds composed of poly(vinyl chloride), chlorinated poly(vinyl chloride), or vinyl chloride copolymers, and the necessary compounding ingredients.

A single chain (polymer molecule) consisting of i repeat units is said to have a degree of polymerisation of i. The molecular weight of such an individual chain (neglecting any small difference due to end groups) may be designated M i , and the species may be referred to as an 'i-mer' or'ith species'. Since, at least in the ideal case, M i is the sum of the weights of all the repeat units in the chain, its value will be different for molecular chains differing in the value of i. e. ) of polymer may be wide or narrow but, as the chains are not all identical, a single molecular weight figure quoted for the whole amount can only be an average value.

Makromol. , 23, 173. 33. Braun, D. and Quarg, W. (1973). , 29/30, 163. 34. Haward, R. N. ) (1973). The Physics of Glassy Polymers, Applied Science Publishers, London, pp. 201-6. 35. Gray, A. and Gilbert M. (1976). Polymer, 17(1), 44-50. 36. D'Amato, R. J. and Strella, S. (1969). 8, 275-86. 37. , Kajiyama, T. and Takayanagi, M. (1976), Polym. Engng. , 16(7), 465-72. 38. , Cerri, E. and Zinelli, G. (1971). Plast. , 39(144), 398-402. 39. Abdel-Alim, A. H. (1975). J. Appl. Polym. , 19(8), 2179-85. 40.

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