Studies on the pore formation mechanism of beta-crystalline polypropylene under stretching
文献类型：期刊论文
| 作者 | Ran, SF; Xu, M |
| 刊名 | CHINESE JOURNAL OF POLYMER SCIENCE
 |
| 出版日期 | 2004-03-01 |
| 卷号 | 22期号:2页码:123-130 |
| 关键词 | Pore Formation Under Stretching Beta-crystalline Polypropylene Mechanism |
| ISSN号 | 0256-7679 |
| 英文摘要 | The pore formation mechanism of beta-crystalline polypropylene under stretching was investigated. The porosity of the samples increases rapidly with stretching, having a maximum at draw ratios around 2 and then decreases monotonically. An abrupt formation process of initial micropores at very low draw ratios was evidenced by in situ SAXS measurements. At the same time the phase transition from beta-crystal to alpha-crystal proceeds slowly in the whole deformation process up to large draw ratios around 5. Comparative studies of alpha- and beta-crystalline polypropylene samples before stretching indicate that in addition to difference in crystal forms the alpha- and beta-crystalline polypropylene samples exhibit quite different morphological features. There are a lot of interfaces in beta-crystalline polypropylene samples, which may have a lower density value and can be easily etched by argon ions and penetrated by small molecules. It was concluded from these experimental facts that the pore formation and crystal transition are two independent phenomena during the deformation of beta-crystalline polypropylene samples, and phase transition from beta-crystal to alpha-crystal could hardly be the origin of pore formation. A defect initiation mechanism was proposed to understand the pore formation behavior of beta-crystalline polypropylenes. |
| 语种 | 英语 |
| WOS记录号 | WOS:000220579500004 |
| 出版者 | SPRINGER-VERLAG HEIDELBERG |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/55563]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Xu, M |
| 作者单位 | Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ran, SF,Xu, M. Studies on the pore formation mechanism of beta-crystalline polypropylene under stretching[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2004,22(2):123-130. |
| APA | Ran, SF,&Xu, M.(2004).Studies on the pore formation mechanism of beta-crystalline polypropylene under stretching.CHINESE JOURNAL OF POLYMER SCIENCE,22(2),123-130. |
| MLA | Ran, SF,et al."Studies on the pore formation mechanism of beta-crystalline polypropylene under stretching".CHINESE JOURNAL OF POLYMER SCIENCE 22.2(2004):123-130. |
入库方式： OAI收割
来源：化学研究所
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