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.
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