Molecular Structure of Poly (vinyl chloride) Resin Prepared by a New Heterogeneous Polymerization Process

Abstract

Abstract: Vinyl chloride(VC) heterogeneous polymerizations, using n-butane as the reaction medium and bis(4-tert-butylcyclohexyl) peroxydicarbonate as the initiator, were carried out to prepare poly (vinyl chloride) (PVC) resins. The chain structure, molecular weight (Mw) and molecular weight distribution (MWD) of resulting PVCresins were characterized by using ¹HNMR and GPC, respectively. It was shown that more PVCchains with -CH₂-CH₂Cl end group were formed in the new polymerization process. The Mw of resulting PVC was lower than that of suspension PVC prepared at the same polymerization temperature and the index of MWD was greater. The Mw decreased and index of MWD increased with the increase of polymerization conversion. The variations on PVCchain structure, Mw and MWD were caused by the chain transfer reaction of PVC macroradicals to n-butane.

Key words: Vinyl chloride, n-Butane, End group, Molecular weight, Molecular weight distribution

CLC Number:

O631.1

TrendMD:

BAO Yong-Zhong, WENG Zhi-Xue, HUANG Zhi-Ming . Molecular Structure of Poly (vinyl chloride) Resin Prepared by a New Heterogeneous Polymerization Process[J]. Chem. J. Chinese Universities, 2003, 24(9): 1727.

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Molecular Structure of Poly (vinyl chloride) Resin Prepared by a New Heterogeneous Polymerization Process

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