Conformational variation and crystalline phase transformation of low syndiotactic polypropylene films in stretched and stress-relaxed states
文献类型：期刊论文
| 作者 | Zhang, XQ; Zhao, Y; Shi, HF; Dong, X; Wang, DJ; Han, CC; Xu, DF |
| 刊名 | JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
 |
| 出版日期 | 2005-10-15 |
| 卷号 | 43期号:20页码:2924-2936 |
| 关键词 | Conformational Analysis Crystallization Ft-ir Orientation Syndiotactic Polypropylene |
| ISSN号 | 0887-6266 |
| DOI | 10.1002/polb.20573 |
| 英文摘要 | Low syndiotactic polypropylene (sPP; rrrr = 80%) films were isothermally crystallized at 0 degrees C (sample S-0) and 90 degrees C (sample S-90) for 65 h, respectively. Fourier transform infrared spectroscopy, differential scanning calorimetry, and wide-angle X-ray diffraction were used to characterize the structure transformation and orientation behavior of samples S-0 and S-90 at both stretched and stress-relaxed states. It was found that stretching (lambda = 0-700%) induces the transformation of the chain conformation from helical to trans-planar form for both S-0 and S-90 films. The stretched S-0 and S-90 samples show well oriented trans-planar chains as well as partially retained helices. Simultaneously, crystalline phase transformation occurs during the stretching and relaxing processes of the investigated sPP samples, i.e., stable form I crystals can be transformed into metastable form III or mesophase by stretching samples, and vice versa. For stretched So sample, form III with trans-planar conformation, which generally exists in highly stretched sPP, cannot be observed, even at higher strains. For sample S-90, however, stretching might induce the formation of both the form III crystals and mesophase with trans-planar chains; releasing the tension, form III again gets converted into trans-planar mesophase and form I crystals. In the stretched and stress-relaxed states of samples S-0 and S-90, the difference of the delicate orientation behavior and relative content of chain conformation and crystalline form can be attributed to the different heat-treating methods of the low syndiotacticity sPP. (c) 2005 Wiley Periodicals, Inc. |
| 语种 | 英语 |
| WOS记录号 | WOS:000232406800009 |
| 出版者 | JOHN WILEY & SONS INC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/56929]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Wang, DJ |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, Key Lab Engn Phys, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, XQ,Zhao, Y,Shi, HF,et al. Conformational variation and crystalline phase transformation of low syndiotactic polypropylene films in stretched and stress-relaxed states[J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,2005,43(20):2924-2936. |
| APA | Zhang, XQ.,Zhao, Y.,Shi, HF.,Dong, X.,Wang, DJ.,...&Xu, DF.(2005).Conformational variation and crystalline phase transformation of low syndiotactic polypropylene films in stretched and stress-relaxed states.JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS,43(20),2924-2936. |
| MLA | Zhang, XQ,et al."Conformational variation and crystalline phase transformation of low syndiotactic polypropylene films in stretched and stress-relaxed states".JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 43.20(2005):2924-2936. |
入库方式： OAI收割
来源：化学研究所
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