CYCLOPENTADIENYLATION OF PVC

CHARACTERIZATION AND THERMAL AND THERMOOXIDATIVE DEGRADATION STUDIES.

B. Iván, Joseph P. Kennedy, Tibor Kelen, Ferenc Tudos

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In the reported experiments, PVC has been cyclopentadienylated by two conventional basic, LiCp and NaCp, and a new acidic, Me//2CpAl, cyclopentadienylating agent. PVCs treated with basic cyclopentadienylating agents undergo severe random dehydrochlorination and exhibit a significant decrease in thermal and thermooxidative stability. In contrast, according to ozonization and degradation experiments, Me//2CpAl does not cause dehydrochlorination during cyclopentadienylation. The thermal stability of PVC treated with relatively high concentrations of Me//2CpAl and Me//3Al at 25 degree C markedly increases due to substitution of labile chlorines in PVC with methyl groups. Acceleration of thermal dehydrochlorination disappears and the length of polyene sequences is reduced on Me//2CpAl and Me//3Al treatment. These observations are attributed to differences in rates of protonation-deprotonation; that is, rates of reinitiation of zipping of treated and untreated PVCs during thermal degradation.

Original languageEnglish
Pages (from-to)9-25
Number of pages17
JournalJournal of polymer science. Part A-1, Polymer chemistry
Volume19
Issue number1
Publication statusPublished - Jan 1981

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Polyvinyl chlorides
Degradation
Deprotonation
Ozonization
Protonation
Chlorine
Pyrolysis
Thermodynamic stability
Substitution reactions
Experiments
Hot Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

CYCLOPENTADIENYLATION OF PVC : CHARACTERIZATION AND THERMAL AND THERMOOXIDATIVE DEGRADATION STUDIES. / Iván, B.; Kennedy, Joseph P.; Kelen, Tibor; Tudos, Ferenc.

In: Journal of polymer science. Part A-1, Polymer chemistry, Vol. 19, No. 1, 01.1981, p. 9-25.

Research output: Contribution to journalArticle

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abstract = "In the reported experiments, PVC has been cyclopentadienylated by two conventional basic, LiCp and NaCp, and a new acidic, Me//2CpAl, cyclopentadienylating agent. PVCs treated with basic cyclopentadienylating agents undergo severe random dehydrochlorination and exhibit a significant decrease in thermal and thermooxidative stability. In contrast, according to ozonization and degradation experiments, Me//2CpAl does not cause dehydrochlorination during cyclopentadienylation. The thermal stability of PVC treated with relatively high concentrations of Me//2CpAl and Me//3Al at 25 degree C markedly increases due to substitution of labile chlorines in PVC with methyl groups. Acceleration of thermal dehydrochlorination disappears and the length of polyene sequences is reduced on Me//2CpAl and Me//3Al treatment. These observations are attributed to differences in rates of protonation-deprotonation; that is, rates of reinitiation of zipping of treated and untreated PVCs during thermal degradation.",
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