ICCAS OpenIR
Multiple melting behavior of isotactic polypropylene and poly(propylene-co-ethylene) after stepwise isothermal crystallization
Zhang, FJ; Gong, YM; He, TB
2003-12-01
Source PublicationEUROPEAN POLYMER JOURNAL
ISSN0014-3057
Volume39Issue:12Pages:2315-2322
AbstractThe multiple melting behavior of several commercial resins of isotactic polypropylene (iPP) and random copolymer, poly(propylene-co-ethylene) (PPE), after stepwise isothermal crystallization (SIC) were studied by differential scanning calorimeter and wide-angle X-ray diffraction (WAXD). For iPP samples, three typical melting endotherms appeared after SIC process when heating rate was lower than 10 degreesC/min. The WAXD experiments proved that only alpha-form crystal was formed during SIC process and no transition from alpha1- to alpha2-form occurred during heating process. Heating rate dependence for each endotherm was discussed and it was concluded that there were only,two major crystals with different thermal stability. For the PPE sample, more melting endotherms appeared after stepwise isothermal crystallization. The introduction of ethylene comonomer in isotactic propylene backbone further decreased the regularity of molecular chain, and the short isotactic propylene sequences could crystallize into gamma-form crystal having a low melting temperature whereas the long sequences crystallized into alpha-form crystal having high melting temperature. (C) 2003 Elsevier Ltd. All rights reserved.
KeywordPolypropylene Dsq Waxd Melt Stepwise Crystallization
DOI10.1016/j.europolymj.2003.08.001
Indexed BySCI
Language英语
WOS IDWOS:000187363300009
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79640
Collection中国科学院化学研究所
Corresponding AuthorZhang, FJ
AffiliationChinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & chem, Changchun 130022, Jilin, Peoples R China
Recommended Citation
GB/T 7714
Zhang, FJ,Gong, YM,He, TB. Multiple melting behavior of isotactic polypropylene and poly(propylene-co-ethylene) after stepwise isothermal crystallization[J]. EUROPEAN POLYMER JOURNAL,2003,39(12):2315-2322.
APA Zhang, FJ,Gong, YM,&He, TB.(2003).Multiple melting behavior of isotactic polypropylene and poly(propylene-co-ethylene) after stepwise isothermal crystallization.EUROPEAN POLYMER JOURNAL,39(12),2315-2322.
MLA Zhang, FJ,et al."Multiple melting behavior of isotactic polypropylene and poly(propylene-co-ethylene) after stepwise isothermal crystallization".EUROPEAN POLYMER JOURNAL 39.12(2003):2315-2322.
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