Enhancing beta-phase content and tensile properties in poly(vinylidene fluoride) by adding halloysite nanotubes and injecting water during extrusion
Enhancing beta-phase content and tensile properties in poly(vinylidene fluoride) by adding halloysite nanotubes and injecting water during extrusion
复制标题
通过添加埃洛石纳米管并在挤出过程中注入水来提高聚偏二氟乙烯中的 β 相含量和拉伸性能
DOI：
10.1016/j.matdes.2016.07.022
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发表时间：
2016
影响因子：
8.4
通讯作者：
Tong Jun
中科院分区：
文献类型：
--
作者：
Wu Min;Huang Han-Xiong;Tong Jun
采用挤出法制备了含5、7和10wt%未改性埃洛石纳米管的聚偏氟乙烯(PVDF)纳米复合材料。扫描电子显微镜显示，注入水后，大量单根纳米管均匀地分散在PVDF基质中，这主要是由于PVDF分子中的氟原子和/或氢原子、水分子和HNTs中的硅氧烷基团之间形成了氢键。用广角X射线衍射仪、傅里叶变换红外光谱和差示扫描量热法研究了PVDF的晶体结构和结晶行为。结果表明，HNTs的加入，尤其是注入水诱导的HNTs的良好分散，有利于提高β/HNTs纳米复合材料的结晶度，形成较高比例的β相(F(HNTs)S)。含10wt%HNTs的纳米复合材料的f(β)达到最大值0.689。此外，较好的HNTs分散性和较高的结晶度和f(β)S提高了复合材料的杨氏模数、拉伸强度和断裂伸长率。
Poly(vinylidene fluoride) (PVDF) nanocomposites containing 5, 7 and 10 wt% unmodified halloysite nanotubes (HNTs) are prepared by using extrusion with and without water injection. Scanning electron microscopy micrographs show that a large number of single nanotubes are well dispersed in the PVDF matrix with water injection, which is mainly attributed to formation of hydrogen bonds among the fluorine and/or hydrogen atoms of PVDF molecule, the water molecules and the siloxane groups of HNTs. The crystal structure and crystallization behavior of the PVDF are investigated using wide angle X-ray diffraction, Fourier transform infrared spectroscopy and differential scanning calorimetry. The results show that the addition of the HNTs especially their better dispersion induced by injected water is beneficial to improving the crystallinities and forming substantially higher fractions of β-phase crystal (F(β)s) in the PVDF/HNTs nanocomposites. TheF(β) for the nanocomposite with 10 wt% HNTs reaches the maximum of 0.689. Moreover, better HNTs dispersion and higher crystallinities andF(β)s improve the Young's moduli, tensile strengths and elongations at break for the PVDF/HNTs nanocomposites.