共查询到20条相似文献,搜索用时 78 毫秒
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聚偏氟乙烯(PVDF)因含氟乙烯基单体,拥有良好的化学稳定性、热学稳定性和机械性能,与其他高分子膜材料相比更容易提高离子交换膜的性能。本实验采用热压法制备PVDF聚乙烯阴离子交换膜,探讨了PVDF含量对膜性能的影响,如膜电阻、离子交换容量、耐破度、含水率和选择透过性。利用红外光谱仪及扫描电子显微镜表征手段对PVDF膜表面性质和结构进行了分析。结果表明,当PVDF含量增加时,膜面电阻、耐破度升高。离子交换容量、含水率,反离子选择透过性降低。虽然PVDF的添加导致含水率、交换容量等膜性能的下降,但耐破度的升高表明膜稳定性和机械性能得到了提升,这赋予PVDF聚乙烯膜一定的使用价值。 相似文献
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以乙二醇二甲基丙烯酸酯和丙烯腈为单体,合成了聚合物poly(AN-co-PEGDMA),然后与聚偏氟乙烯(PVDF)共混,制备了不同poly(AN-co-PEGDMA)含量的PVDF/poly(AN-co-PEGDMA)共混隔膜,利用X射线衍射、扫描电子显微镜(SEM)、差示扫描量热对共混隔膜的性能进行表征。结果表明,随着poly(AN-co-PEGDMA)含量的增加,PVDF/poly(AN-co-PEGDMA)的玻璃化转变温度逐渐提高,衍射峰的谱峰强度逐渐降低,隔膜的结晶度降低。SEM结果显示,随着poly(AN-co-PEGDMA)含量的增加共混隔膜的孔隙变大,有利于电解液的有效吸收。通过对PVDF/poly(AN-co-PEGDMA)共混隔膜电导率、吸液率的测定,表明在poly(AN-co-PEGDMA)质量分数为30%时,制得的共混隔膜的性能较佳。在此基础上,对共混隔膜构建的聚合物锂离子电池的电化学稳定窗口、电池容量和循环性能进行测试,其电化学稳定窗口为0~4.7 V(vs Li+/Li),放电电容为1.433~1.151 mAh,可以满足商业使用要求,具有广阔的应用前景。 相似文献
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聚偏氟乙烯膜的亲水性改性研究进展 总被引:11,自引:0,他引:11
疏水性聚合物膜的亲水性改性是当前分离膜研究的热点之一。从膜表面亲水改性和膜材料亲水性改性的角度出发,综述了聚偏氟乙烯(PVDF)分离膜的各种改性方法的特点及改性效果,分析了其亲水改性机理,指出膜材料共混改性是今后发展的主要方向。 相似文献
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锂电池用聚偏氟乙烯粘结剂 总被引:1,自引:0,他引:1
锂电池用粘结剂是制造锂电池的重要材料之一,可直接影响其性能.介绍了锂电池用粘结剂应具备的特性、种类及存在的问题;叙述了日本专利中,偏氟乙烯作为锂电池用粘结剂和用偏氟乙烯与第二及第三单体的共聚改性、聚偏氟乙烯与其他聚合物共混改性等的方法. 相似文献
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J. Li 《Polymer-Plastics Technology and Engineering》2013,52(6):646-651
The current study examines the tribological performance of poly(vinylidene fluoride) (PVDF) and carbon fiber-reinforced poly(vinylidene fluoride) (CF/PVDF) under dry sliding condition. Different contents of carbon fibers were employed as reinforcement. All filled and unfilled polyimide composites were tested against CGr15 ball and representative testing was performed. The effects of carbon fiber content on tribological properties of the composites were investigated. The worn surface morphologies of neat PVDF and its composites were examined by scanning electron microscopy (SEM) and the wear mechanisms were discussed. Moreover, all filled PVDFs have superior tribological characteristics to unfilled PVDFs. The optimum wear reduction was obtained when the content of carbon fiber is 20 vol%. 相似文献
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Miroslav Mrlik Markta Il
íkov Josef Osi
ka Erika Kutlkov 《International journal of molecular sciences》2022,23(10)
In this work, graphene oxide (GO) particles were modified with a nano-sized poly(butyl acrylate) (PBA) layer to improve the hydrophobicity of the GO and improve compatibility with PVDF. The improved hydrophobicity was elucidated using contact angle investigations, and exhibit nearly 0° for neat GO and 102° for GO-PBA. Then, the neat GO and GO-PBA particles were mixed with PVDF using a twin screw laboratory extruder. It was clearly shown that nano-sized PBA layer acts as plasticizer and shifts glass transition temperature from −38.7 °C for neat PVDF to 45.2 °C for PVDF/GO-PBA. Finally, the sensitivity to the vibrations of various frequencies was performed and the piezoelectric constant in the thickness mode, d33, was calculated and its electrical load independency were confirmed. Received values of the d33 were for neat PVDF 14.7 pC/N, for PVDF/GO 20.6 pC/N and for PVDF/GO-PBA 26.2 pC/N showing significant improvement of the vibration sensing and thus providing very promising systems for structural health monitoring and data harvesting. 相似文献
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Mihaela Baibarac Monica Daescu Elena Matei Daniela Nastac Oana Cramariuc 《International journal of molecular sciences》2021,22(15)
In this work, synthesis and optical properties of a new composite based on poly(o-phenylenediamine) (POPD) fiber like structures, poly(vinylidene fluoride) (PVDF) spheres and double-walled carbon nanotubes (DWNTs) are reported. As increasing the PVDF weight in the mixture of the chemical polymerization reaction of o-phenylenediamine, the presence of the PVDF spheres onto the POPD fibers surface is highlighted by scanning electron microscopy (SEM). The down-shift of the Raman line from 1421 cm−1 to 1415 cm−1 proves the covalent functionalization of DWNTs with the POPD-PVDF blends. The changes in the absorbance of the IR bands peaked around 840, 881, 1240 and 1402 cm−1 indicate hindrance steric effects induced of DWNTs to the POPD fiber like structures and the PVDF spheres, as a consequence of the functionalization process of carbon nanotubes with macromolecular compounds. The presence of the PVDF spheres onto the POPD fiber like structures surface induces a POPD photoluminescence (PL) quenching process. An additional PL quenching process of the POPD-PVDF blends is reported to be induced in the presence of DWNTs. The studies of anisotropic PL highlight a change of the angle of the binding of the PVDF spheres onto the POPD fiber like structures surface from 50.2° to 38° when the carbon nanotubes concentration increases in the POPD-PVDF/DWNTs composites mass up to 2 wt.%. 相似文献
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Poly(vinylidene fluoride) (PVDF) nanocomposites with different loadings of multiwalled carbon nanotubes (MWNT) were prepared by melt‐compounding technique. A homogeneous dispersion of MWNT throughout PVDF matrix was observed on the cryo‐fractured surfaces by scanning electron microscopy. Thermogravimetric analysis results indicated that the thermal stability of neat PVDF was improved with the incorporation of MWNT. Dynamic mechanical analysis showed a significant improvement in the storage modulus over a temperature range from ?125 to 75°C with the addition of MWNT. The melt‐rheological studies illustrated that incorporating MWNT into PVDF matrix resulted in higher complex viscosities (|η*|), storage modulus (G′), loss modulus (G″), and lower loss factor (tan δ) than those of neat PVDF. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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