Effect of amorphous microphase on structural evolution of polypropylene membrane at hot stretching
This work is aimed at researching the effect of amorphous microphase on structural evolution of polypropylene (PP) membrane at hot stretching. Herein, the functioned copolymer PPO(nPe)0.75-(Py)0.25 (PPOR) was synthesized to introduce the amorphous microphase, enriched region formed by physical cross...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Polymer Testing |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142941825001412 |
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| Summary: | This work is aimed at researching the effect of amorphous microphase on structural evolution of polypropylene (PP) membrane at hot stretching. Herein, the functioned copolymer PPO(nPe)0.75-(Py)0.25 (PPOR) was synthesized to introduce the amorphous microphase, enriched region formed by physical crosslink, in PP/PPOR membrane by melt-stretching. The aggregated structure evolution led to the structure and performance modification of blending membrane. First, the amorphous microphase resulted in the amorphous thickness of the PP/PPOR film decreasing by 26.7 %. During the hot stretching process, the micropore formation was accompanied by a decrease of crystal length and an increase of amorphous orientation in the PP membrane. However, the presence of amorphous microphase reduced crystal destruction and amorphous orientation in the PP/PPOR membrane, which contributes to a greater region of micropore and a smaller pore size. Eventually, compared with pure PP membrane, the porosity of PP/PPOR membrane increased by 21.7 % at maximum and the lithium-ion conductivity of the PP/PPOR-10 membrane was enhanced by 13.0 %. This work provides a practical way from molecular design to separator design. |
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| ISSN: | 1873-2348 |