Chemical and molecular structure of poly(vinyl chloride)
1981; International Union of Pure and Applied Chemistry; Volume: 53; Issue: 2 Linguagem: Inglês
10.1351/pac198153020385
ISSN1365-3075
Autores Tópico(s)biodegradable polymer synthesis and properties
ResumoPoly(vinyl chloride) presents a number of detects er 1,OO monomer units (m.u.), as follows: 4 -6 ch].orome- thy].branches; 0.4 2.4 chioroethyl branches; 0.4 -1.6 bu- tyl branches (uncertain value); 0.18 2.4 long branches (un.certain value); 6 7 head-t.o.head structures (uncertain va lue) ; 1.4 3 total double bonds ; 0.07 -0.27 internal double bonds.The structure of internal unsaturation as allylic and ketochloroallylic chlorides is discussed.Labile chlorine atoms, 0.6 2.5 per 1,000 monomer units, were found, from which: 0.5 2.5 allylic chlOrine (CiA) or ketochioroallylic chlorine (C1COA) and 0.16 1 chlorine at tertiary carbon (C1T) (uncertain value).A general mechanism is proposed which explains the formation of unsaturated groups found in NMR and 13C NMR spectra.During polymerization some de'- fects can undergo further transformations.The chlorination process of poly(vin.ylchloride) involves partially the chlorine addition reaction to the intermediary formed double bond.Raman spectroscopy supplies comparative data with NMR and lB regarding the chain configuration.Rotation isomery and its consequences upon the reactions of the poly(vinyl chloride) in solide state are discussed.This paper presents the main worldwide progresses which have been made since the last International Symposium on PVC in Lyon (1976), towards the elucidation of the chemical and molecular structure of this polymer.
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