The effect of end groups on the thermal degradation of poly(methyl methacrylate)

Yu Hsiang Hu, Chuh-Yung Chen

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The thermal degradation of poly(methyl methacrylate) was studied using a system of thiols as initiators. Depolymerization is the dominant reaction in the thermal degradation of such polymers, according to thermal analysis. The degradation mechanism involves only main-chain scission. Three methods of degradation were applied to elucidate the thermal degradation behaviour. The activation energy for the degradation of PMMA-thiols is 170 kJ/mol, higher than that of PMMA-AIBN (60 kJ/mol), as measured by the Flynn method. According to Ozawa's method, the activation energy is 210 kJ/mol higher than that of an AIBN-initiated polymer (148-151 kJ/mol). By Kissinger's measurement method, this system has a frequency factor (∼ 1010) five orders of magnitude higher than the ordinary PMMA (∼ 105). The observed results are explained as a "blocking effect".

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalPolymer Degradation and Stability
Volume82
Issue number1
DOIs
Publication statusPublished - 2003 Sep 1

Fingerprint

thermal degradation
Polymethyl Methacrylate
Polymethyl methacrylates
polymethyl methacrylate
Pyrolysis
degradation
thiols
Degradation
Activation energy
Sulfhydryl Compounds
activation energy
depolymerization
Polymers
Depolymerization
polymers
initiators
Thermoanalysis
cleavage
thermal analysis
azobis(isobutyronitrile)

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "The thermal degradation of poly(methyl methacrylate) was studied using a system of thiols as initiators. Depolymerization is the dominant reaction in the thermal degradation of such polymers, according to thermal analysis. The degradation mechanism involves only main-chain scission. Three methods of degradation were applied to elucidate the thermal degradation behaviour. The activation energy for the degradation of PMMA-thiols is 170 kJ/mol, higher than that of PMMA-AIBN (60 kJ/mol), as measured by the Flynn method. According to Ozawa's method, the activation energy is 210 kJ/mol higher than that of an AIBN-initiated polymer (148-151 kJ/mol). By Kissinger's measurement method, this system has a frequency factor (∼ 1010) five orders of magnitude higher than the ordinary PMMA (∼ 105). The observed results are explained as a {"}blocking effect{"}.",
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The effect of end groups on the thermal degradation of poly(methyl methacrylate). / Hu, Yu Hsiang; Chen, Chuh-Yung.

In: Polymer Degradation and Stability, Vol. 82, No. 1, 01.09.2003, p. 81-88.

Research output: Contribution to journalArticle

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