Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films
Polyvinylidene fluoride (PVDF) and poly(methyl methacrylate) (PMMA) blend films were prepared using biaxial stretching. The effects of PMMA content and stretching ratio on the crystallinity and β phase fraction of PVDF in blend films were investigated. The distributions of crystallinity and β phase...
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MDPI AG
2021-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/7/998 |
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| author | Ye Zhou Wenting Liu Bin Tan Cheng Zhu Yaru Ni Liang Fang Chunhua Lu Zhongzi Xu |
| author_facet | Ye Zhou Wenting Liu Bin Tan Cheng Zhu Yaru Ni Liang Fang Chunhua Lu Zhongzi Xu |
| author_sort | Ye Zhou |
| collection | DOAJ |
| description | Polyvinylidene fluoride (PVDF) and poly(methyl methacrylate) (PMMA) blend films were prepared using biaxial stretching. The effects of PMMA content and stretching ratio on the crystallinity and β phase fraction of PVDF in blend films were investigated. The distributions of crystallinity and β phase fraction on variable locations were also studied. The results of FTIR and XRD showed that β phase appeared in PVDF/PMMA blends after extrusion and casting procedures. Although β phase fraction decreased after preheating, there was still an increasing trend during following biaxial stretching. More importantly, the increase in PMMA content improved β phase fraction, and the highest β phase fraction of 93% was achieved at PMMA content of 30 wt% and stretching ratio of 2×2. Besides, the reduction in PMMA content and the increase in stretching ratio improved the crystallinity of PVDF. The mechanical properties of the stretched films were significantly improved by increasing the stretching ratio as well. The uniform stress distribution on different regions of biaxial stretching films contributed to the uniform distribution of β phase fraction and crystallinity of PVDF with the aid of simulation. This work confirmed that biaxial stretching can be a candidate method to prepare PVDF/PMMA blend films with uniform distributions of comparable β phase and crystallinity of PVDF. |
| first_indexed | 2024-03-10T12:56:39Z |
| format | Article |
| id | doaj.art-f8fc3397c75441fdb6c51709d5896ac2 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T12:56:39Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
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| series | Polymers |
| spelling | doaj.art-f8fc3397c75441fdb6c51709d5896ac22023-11-21T11:51:39ZengMDPI AGPolymers2073-43602021-03-0113799810.3390/polym13070998Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA FilmsYe Zhou0Wenting Liu1Bin Tan2Cheng Zhu3Yaru Ni4Liang Fang5Chunhua Lu6Zhongzi Xu7State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaDepartment of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USAState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaPolyvinylidene fluoride (PVDF) and poly(methyl methacrylate) (PMMA) blend films were prepared using biaxial stretching. The effects of PMMA content and stretching ratio on the crystallinity and β phase fraction of PVDF in blend films were investigated. The distributions of crystallinity and β phase fraction on variable locations were also studied. The results of FTIR and XRD showed that β phase appeared in PVDF/PMMA blends after extrusion and casting procedures. Although β phase fraction decreased after preheating, there was still an increasing trend during following biaxial stretching. More importantly, the increase in PMMA content improved β phase fraction, and the highest β phase fraction of 93% was achieved at PMMA content of 30 wt% and stretching ratio of 2×2. Besides, the reduction in PMMA content and the increase in stretching ratio improved the crystallinity of PVDF. The mechanical properties of the stretched films were significantly improved by increasing the stretching ratio as well. The uniform stress distribution on different regions of biaxial stretching films contributed to the uniform distribution of β phase fraction and crystallinity of PVDF with the aid of simulation. This work confirmed that biaxial stretching can be a candidate method to prepare PVDF/PMMA blend films with uniform distributions of comparable β phase and crystallinity of PVDF.https://www.mdpi.com/2073-4360/13/7/998PVDFPMMAthermo-mechanical fieldsbiaxial stretchingβ phasecrystallinity |
| spellingShingle | Ye Zhou Wenting Liu Bin Tan Cheng Zhu Yaru Ni Liang Fang Chunhua Lu Zhongzi Xu Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films Polymers PVDF PMMA thermo-mechanical fields biaxial stretching β phase crystallinity |
| title | Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films |
| title_full | Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films |
| title_fullStr | Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films |
| title_full_unstemmed | Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films |
| title_short | Crystallinity and β Phase Fraction of PVDF in Biaxially Stretched PVDF/PMMA Films |
| title_sort | crystallinity and β phase fraction of pvdf in biaxially stretched pvdf pmma films |
| topic | PVDF PMMA thermo-mechanical fields biaxial stretching β phase crystallinity |
| url | https://www.mdpi.com/2073-4360/13/7/998 |
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