Knowledge Management System Of Institute of Chemistry，CAS
| 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 Publication | POLYMER
 |
| ISSN | 0032-3861 |
| Volume | 48Issue:6Pages:1741-1748 |
| Abstract | The 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. |
| Keyword | Crystal Stability Syndiotactic Polypropylene Supercritical Carbon Dioxide |
| DOI | 10.1016/j.polymer.2007.01.035 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000245257300037 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iccas.ac.cn/handle/121111/62458 |
| Collection | 中国科学院化学研究所 |
| Corresponding Author | He, Jiasong |
| Affiliation | 1.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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