ICCAS OpenIR
Stability of form II of syndiotactic polypropylene confirmed by cold and melt crystallization in supercritical carbon dioxide
Ma, Weiming; Yu, Jian; He, Jiasong; Wang, Dujin
2007-03-08
Source PublicationPOLYMER
ISSN0032-3861
Volume48Issue:6Pages:1741-1748
AbstractThe form II of syndiotactic polypropylene (sPP) has been found more thermodynamically stable than form I when melt crystallized at pressures above 150 MPa, while the reverse occurs below 150 MPa. In the present study, through the cold and melt crystallization in supercritical CO2 the stability of various polymorphic forms of sPP, especially form II, was confirmed by using Fourier-transform infrared spectroscopy and wide-angle X-ray diffraction. Compared with the formation of pure form I at high temperatures under ambient condition, a mixture of forms I and II was formed by both the cold and melt crystallization in supercritical CO2. This atmosphere changed the relative stability of forms I and II, and made the form II more thermodynamically stable than form I. The increased solubility parameters of the surroundings, at which the form II was formed, also confirmed the stability of form II over form I in supercritical CO2. The incubation pressure was the key factor affecting the formation and amount of form II. Supercritical CO2 provides a combining severe condition to obtain the form II crystal, although its pressure was much lower than the elevated pressures (> 150 MPa) reported before. (c) 2007 Elsevier Ltd. All rights reserved.
KeywordCrystal Stability Syndiotactic Polypropylene Supercritical Carbon Dioxide
DOI10.1016/j.polymer.2007.01.035
Indexed BySCI
Language英语
WOS IDWOS:000245257300037
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62458
Collection中国科学院化学研究所
Corresponding AuthorHe, Jiasong
Affiliation1.Chinese Acad Sci, Inst Chem, BNLMS, Key Lab Engn Plast,Joint Lab Polymer Sci & Mat, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Ma, Weiming,Yu, Jian,He, Jiasong,et al. Stability of form II of syndiotactic polypropylene confirmed by cold and melt crystallization in supercritical carbon dioxide[J]. POLYMER,2007,48(6):1741-1748.
APA Ma, Weiming,Yu, Jian,He, Jiasong,&Wang, Dujin.(2007).Stability of form II of syndiotactic polypropylene confirmed by cold and melt crystallization in supercritical carbon dioxide.POLYMER,48(6),1741-1748.
MLA Ma, Weiming,et al."Stability of form II of syndiotactic polypropylene confirmed by cold and melt crystallization in supercritical carbon dioxide".POLYMER 48.6(2007):1741-1748.
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