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 |
| 通讯作者 | Wang, dj() |
| 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. |
| WOS关键词 | PLANAR ZIGZAG FORM ; 0 DEGREES-C ; MESOMORPHIC FORM ; POLYMORPHIC BEHAVIOR ; ELASTIC BEHAVIOR ; FT-IR ; MORPHOLOGY ; TEMPERATURE ; FIBERS |
| WOS研究方向 | Polymer Science |
| WOS类目 | Polymer Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000232406800009 |
| 出版者 | JOHN WILEY & SONS INC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2377715 |
| 专题 | 中国科学院大学 |
| 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. |
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来源：中国科学院大学
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