Effects of bulky 2,2 '-substituents in dianhydrides on the microstructures and gas transport properties of thermally rearranged polybenzoxazoles
文献类型：期刊论文
| 作者 | Lu, Yao; Hu, Xiaofan; Lee, Won Hee; Bae, Joon Yong; Zhao, Jiayi; Nie, Wei; Wang, Zhen; Yan, Jingling; Lee, Young Moo |
| 刊名 | JOURNAL OF MEMBRANE SCIENCE
 |
| 出版日期 | 2021 |
| 卷号 | 639 |
| 关键词 | POSITION FUNCTIONAL-GROUP PRECURSOR SYNTHESIS ROUTE POLYIMIDE MEMBRANES POLYMER MEMBRANES INTRINSIC MICROPOROSITY PERMEATION PROPERTIES TR PROCESS SEPARATION PERFORMANCE COPOLYMERS |
| 英文摘要 | The chain interactions of hydroxyl polyimide (HPI) precursors, such as chain packing and 7C-7C stacking interactions, significantly affect the microstructures and gas separation performance of the resulting thermally rearranged polybenzoxazoles (TR-PBOs). In this study, HPIs with various 2,2'-substituents in their anhydrides (BPDA-AP, PBPDA-AP, and 12FPBPDA-AP) were prepared through polycondensation of three dianhydrides (4,4'-biphenyltetracarboxylic dianhydride (BPDA), 2,2'-diphenyl-4,4',5,5'-biphenyltetracarboxylic dianhydride (PBPDA), and 2,2'-bis(3 '',5 ''-ditrifluommethylphenyl)-4,4',5,5'-biphenyltetracarboxylic dianhydride (12FPBPDA)) with 2,2'-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (AP). The dihedral angles and rotational barriers for PBPDA and 12FPBPDA were considerably larger than those for BPDA. Thus, the inter- and intra-molecular chain interactions were more pronounced for BPDA-AP than for PBPDA-AP and 12FPBPDA-AP. Consequently, the glass transition and TR temperatures of the HPIs were in the order of BPDA-AP > PBPDA-AP > 12FPBPDA-AP, whereas fractional free volume (FFV) and interchain distances followed the opposite trend. After TR, the FFV and interchain distances of the TR-PBO from BPDA-AP increased more than those from PBPDA-AP and 12FPBPDA-AP, whereas the pi-pi stacking interactions in BPDA-AP were well maintained. Consequently, BPDA-AP-450 exhibited the highest increase in gas permeability relative to its HPI precursor but the poorest plasticization resistance among fully converted TR-PBOs. This work demonstrated that chain packing played a crucial role in the TR behavior, microstructures, and gas transport properties of TR-PBOs. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/21291]  |
| 专题 | 2021专题_期刊论文 |
| 作者单位 | 1.Lee, YM (corresponding author), Hanyang Univ, Dept Energy Engn, Coll Engn, Seoul 04763, South Korea. 2.Wang, Z 3.Yan, JL (corresponding author), Chinese Acad Sci, Changchun Inst Appl Chem, Changchun 130022, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Lu, Yao,Hu, Xiaofan,Lee, Won Hee,et al. Effects of bulky 2,2 '-substituents in dianhydrides on the microstructures and gas transport properties of thermally rearranged polybenzoxazoles[J]. JOURNAL OF MEMBRANE SCIENCE,2021,639. |
| APA | Lu, Yao.,Hu, Xiaofan.,Lee, Won Hee.,Bae, Joon Yong.,Zhao, Jiayi.,...&Lee, Young Moo.(2021).Effects of bulky 2,2 '-substituents in dianhydrides on the microstructures and gas transport properties of thermally rearranged polybenzoxazoles.JOURNAL OF MEMBRANE SCIENCE,639. |
| MLA | Lu, Yao,et al."Effects of bulky 2,2 '-substituents in dianhydrides on the microstructures and gas transport properties of thermally rearranged polybenzoxazoles".JOURNAL OF MEMBRANE SCIENCE 639(2021). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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