Mechanistic Insights into the Shear-Induced beta-Form Crystal Formation of iPP
文献类型：期刊论文
| 作者 | Luo, Baojing1; Li, Hongfei2; Zhou, Chengbo1; Zhang, Wenyang1; Li, Jingqing1; He, Xuehao3; Jiang, Shichun1 |
| 刊名 | MACROMOLECULAR CHEMISTRY AND PHYSICS
 |
| 出版日期 | 2016-06-01 |
| 卷号 | 217期号:12页码:1354-1360 |
| 关键词 | isotactic poly(propylene) mechanism of beta-iPP formation shear-induced crystallization |
| 英文摘要 | The conformation of a helical type polymer chain in the crystalline phase prefers the state with lower energy. The molecular simulation of the melting behaviors of alpha and beta isotactic poly(propylene) (iPP) crystals with ultrafast heating shows that the ratio of right-handed and left-handed helix stays at 50% in a -iPP and changes from 100% to 50% in beta-iPP before and after melting. Till date, the formation of beta form crystal in iPP has not been understood well together with the mechanism of the crystallization process. One of the approaches to produce beta-iPP is to shear the melt. The infl uence of shear fl ow on the crystallization behavior of iPP was investigated via ex situ and in situ X-ray measurements. It was found that preceding or simultaneously initiated formation of beta-iPP together with alpha-iPP occurs under proper shear conditions. The beta-rich iPP sample could no longer form beta crystal at 135 degrees C after heating to the beta-melting temperature with the melting of beta-iPP and the retaining of oriented alpha-iPP, which is contrary to the accepted formation process of beta-iPP. A mechanism was proposed to understand the shear-induced beta crystal in iPP, considering the mesophase and stereocomplex type helical conformation of the polymer chains. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/35171]  |
| 专题 | 化学研究所_高分子物理与化学实验室 |
| 作者单位 | 1.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 3.Tianjin Univ, Sch Sci, Dept Chem, Tianjin 300072, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Baojing,Li, Hongfei,Zhou, Chengbo,et al. Mechanistic Insights into the Shear-Induced beta-Form Crystal Formation of iPP[J]. MACROMOLECULAR CHEMISTRY AND PHYSICS,2016,217(12):1354-1360. |
| APA | Luo, Baojing.,Li, Hongfei.,Zhou, Chengbo.,Zhang, Wenyang.,Li, Jingqing.,...&Jiang, Shichun.(2016).Mechanistic Insights into the Shear-Induced beta-Form Crystal Formation of iPP.MACROMOLECULAR CHEMISTRY AND PHYSICS,217(12),1354-1360. |
| MLA | Luo, Baojing,et al."Mechanistic Insights into the Shear-Induced beta-Form Crystal Formation of iPP".MACROMOLECULAR CHEMISTRY AND PHYSICS 217.12(2016):1354-1360. |
入库方式： OAI收割
来源：化学研究所
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