Thermal degradation of star-shaped poly(epsilon-caprolactone)
Xie, Wenyuan1,2; Gan, Zhihua1
AbstractThermal degradation of a serials of star-shaped poly(epsilon-caprolactone) (PCL) with well-defined arm numbers and arm length was investigated. The weight loss of star-shaped PCL during heating process showed a two-stage character, and its dependence on molecular weight and multi-armed structure was well discussed. It was found that the thermal stability could be improved not only by increasing molecular weight but also by increasing arm numbers when the molecular weight is in a certain range. Based on the analyses of pyrolytic products by (1)H NMR and TGA-FTIR, two mechanisms of thermal degradation for the random cleavage of ester bonds of PCL chains were proposed. Ester bonds were pyrolyzed into alkene and carboxyl functional groups in mechanism I while they were pyrolyzed into ketene and hydroxyl functional groups in mechanism II. The effects of multi-armed structure of star-shaped PCL on the cleavage of ester bonds of PCL chains were discussed in terms of the limitation of central "core" on mobility of each PCL arm. Combined the results of viscosity analysis with thermal analysis, it could be concluded that both thermal stability and processability of PCL materials can be improved by controlling the multi-armed structures. (C) 2009 Elsevier Ltd. All rights reserved.
KeywordThermal Degradation Star-shaped Poly(Epsilon-caprolactone) Multi-armed Structure Molecular Weight Pyrolytic Products
Indexed BySCI
WOS IDWOS:000267815700002
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGan, Zhihua
Affiliation1.Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
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GB/T 7714
Xie, Wenyuan,Gan, Zhihua. Thermal degradation of star-shaped poly(epsilon-caprolactone)[J]. POLYMER DEGRADATION AND STABILITY,2009,94(7):1040-1046.
APA Xie, Wenyuan,&Gan, Zhihua.(2009).Thermal degradation of star-shaped poly(epsilon-caprolactone).POLYMER DEGRADATION AND STABILITY,94(7),1040-1046.
MLA Xie, Wenyuan,et al."Thermal degradation of star-shaped poly(epsilon-caprolactone)".POLYMER DEGRADATION AND STABILITY 94.7(2009):1040-1046.
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