Estimations of the Thicknesses of Smectic Layer and Rigid Amorphous Layer in Mesomorphic Isotactic Polypropylene with Synchrotron Small-Angle and Wide-Angle X-Ray Scattering
文献类型：期刊论文
| 作者 | Li, Xiangyang1,2 ; Liu, Tangguo1,2; Lin, Yongxing2; Chen, Lin2; Tian, Xingyou2
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| 刊名 | MACROMOLECULAR CHEMISTRY AND PHYSICS
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| 出版日期 | 2024-10-07 |
| 关键词 | Mesomorphic-alpha phase transition Nucleation Rigid amorphous coils SAXS WAXD |
| ISSN号 | 1022-1352 |
| DOI | 10.1002/macp.202400328 |
| 通讯作者 | Li, Xiangyang(xiangyangli@issp.ac.cn) |
| 英文摘要 | Despite extensive research, the stabilization mechanism of mesomorphic isotactic polypropylene (iPP) at room temperature has not been elucidated completely. To address this issue, nanoscale structural information is indispensable. In this study, mesomorphic-alpha phase transition is studied with synchrotron wide-angle diffraction and small-angle X-ray scattering. It is found that during phase transition, the mobile amorphous content remained unchanged, while rigid amorphous fraction (RAF) decreased constantly, accompanied by an increase in long period. Assuming that the increase in long period is induced by the extension of the rigid amorphous coil (RAC), the thickness of RAF (RRAF) is estimated, which is found to be 2.2 nm. This value is greater than the length of b axis in alpha crystal cell, which can be the reason that folded-chain iPP clusters in mesomorphic iPP cannot approach closer to form alpha crystal at room temperature. Besides, with RRAF, the thickness of smectic layer is estimated, which is found to be 0.9 nm. At this thickness, bulk-free energy cannot compensate for the folded-surface free energy, which can be the other reason that mesomorphic iPP chains cannot transit into alpha crystal at room temperature. The information obtained in this study is favorable for understanding the stabilization mechanism of mesomorphic iPP. The thicknesses of smectic layer and rigid amorphous layer in mesomorphic iPP are estimated with the change of a long period during mesomorphic-alpha phase transition. The thickness of smectic layer is lower than the minimum thickness for alpha nucleation, while the thickness of a rigid amorphous layer is larger than the length of the b-axis, preventing mesomorphic-alpha phase transition at room temperature. image |
| WOS关键词 | MONOCLINIC PHASE-TRANSITION ; ATOMIC-FORCE MICROSCOPY ; MESOPHASE FORMATION ; ALPHA TRANSITION ; PROPYLENE ; CRYSTALLIZATION ; COPOLYMERS ; MORPHOLOGY ; CRYSTALS ; NANOCALORIMETRY |
| 资助项目 | National Natural Science Foundation of China ; Collaborative Innovation Program of Hefei Science Center, CAS[2022HSCCIP014] ; [22175183] |
| WOS研究方向 | Polymer Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001327204300001 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| 资助机构 | National Natural Science Foundation of China ; Collaborative Innovation Program of Hefei Science Center, CAS |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/135776]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Li, Xiangyang |
| 作者单位 | 1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Solid State Phys, Hefei Inst Phys Sci, Key Lab Photovolta & Energy Conservat Mat, Hefei 230031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Xiangyang,Liu, Tangguo,Lin, Yongxing,et al. Estimations of the Thicknesses of Smectic Layer and Rigid Amorphous Layer in Mesomorphic Isotactic Polypropylene with Synchrotron Small-Angle and Wide-Angle X-Ray Scattering[J]. MACROMOLECULAR CHEMISTRY AND PHYSICS,2024. |
| APA | Li, Xiangyang,Liu, Tangguo,Lin, Yongxing,Chen, Lin,&Tian, Xingyou.(2024).Estimations of the Thicknesses of Smectic Layer and Rigid Amorphous Layer in Mesomorphic Isotactic Polypropylene with Synchrotron Small-Angle and Wide-Angle X-Ray Scattering.MACROMOLECULAR CHEMISTRY AND PHYSICS. |
| MLA | Li, Xiangyang,et al."Estimations of the Thicknesses of Smectic Layer and Rigid Amorphous Layer in Mesomorphic Isotactic Polypropylene with Synchrotron Small-Angle and Wide-Angle X-Ray Scattering".MACROMOLECULAR CHEMISTRY AND PHYSICS (2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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