Thermal and photodegradation of vinyl chloride/vinyl bromide copolymers

Dietrich Braun, Bertram Böhringer, B. Iván, Erzsébet Móri, Tibor Kelen, Ferenc Tüdős

Research output: Contribution to journalArticle

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Abstract

Vinyl chloride/vinyl bromide (VC/VBr) copolymers have been synthesized by radical copolymerization in bulk. Conversion increases and molecular weight of the copolymers decreases with increasing VBr in the feed. This indicates that VBr is a chain transfer agent in VC/VBr copolymerization systems. In accordance with the lower thermal stability of the vinylbromide homopolymer (PVBr), thermal degradation experiments show that the stability of the copolymers significantly decreases with increasing VBr content. It has been found that the initial rate of dehydrohalogenation is an exponential function of VBr content during thermal degradation of VC/VBr copolymers. In separate experiments, HBr evolved during degradation has been determined by a bromide selective electrode. The initial dehydrobromination rates of VC/VBr copolymers containing higher fractions of VBr are markedly higher than the initial dehydrochlorination rates. This clearly indicates the lower thermal stability of VBr monomer units compared with VC units. UV and visible spectra of degraded VC/VBr copolymers show that the absorption and the average length of polyenes are higher for samples with higher VBr content. Dehydrohalogenation curves obtained during photodegradation of VC/VBr copolymers show a faster initial phase followed by a slower stationary phase. The initial rate of dehydrohalogenation is higher for copolymers containing higher fractions of VBr, whereas these copolymers reach the slower stationary phases at lower extents of dehydrohalogenation.

Original languageEnglish
Pages (from-to)165-182
Number of pages18
JournalDie Angewandte Makromolekulare Chemie
Volume143
Issue number1
DOIs
Publication statusPublished - 1986

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Vinyl Chloride
Photodegradation
Copolymers
Copolymerization
Pyrolysis
Thermodynamic stability
Polyenes
Hot Temperature
vinyl bromide
Exponential functions
Homopolymerization
Bromides
Monomers
Experiments
Molecular weight
Degradation
Electrodes

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Thermal and photodegradation of vinyl chloride/vinyl bromide copolymers. / Braun, Dietrich; Böhringer, Bertram; Iván, B.; Móri, Erzsébet; Kelen, Tibor; Tüdős, Ferenc.

In: Die Angewandte Makromolekulare Chemie, Vol. 143, No. 1, 1986, p. 165-182.

Research output: Contribution to journalArticle

Braun, Dietrich ; Böhringer, Bertram ; Iván, B. ; Móri, Erzsébet ; Kelen, Tibor ; Tüdős, Ferenc. / Thermal and photodegradation of vinyl chloride/vinyl bromide copolymers. In: Die Angewandte Makromolekulare Chemie. 1986 ; Vol. 143, No. 1. pp. 165-182.
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