纳米镀银二氧化硅纤维对聚偏氟乙烯结晶性能的影响
发布时间:2018-11-21 16:09
【摘要】:聚偏氟乙烯(PVDF)因其优异的压电、热电等电性能和良好的物理化学方面的性能,在电子和生物医学等领域有着广泛的应用。PVDF是含有五种晶型的半结晶性的聚合物,不同的晶体结构会使PVDF材料表现出不相同的性能。静电纺丝技术是制备纳米尺度的纤维的简单而又有效的方法。本文通过静电纺丝方法制备了纳米二氧化硅纤维,通过多巴胺的仿生修饰在室温条件下对其进行表面处理,然后进行化学镀银。用溶液铺膜法制备了纳米镀银二氧化硅纤维/PVDF复合膜,探讨了 PVDF的结晶机理,考察了二氧化硅纤维镀银后对PVDF结晶结构及性能的影响。本论文的主要研究内容如下:(1)通过静电纺丝技术制备了纳米二氧化硅纤维,用多巴胺对其进行表面仿生修饰,通过改变多巴胺用量,获得了表面粗糙且聚多巴胺沉积均匀的纤维;以葡萄糖作为还原剂,聚乙烯吡咯烷酮(PVP)作稳定剂和分散剂,对沉积聚多巴胺的纤维进行化学镀银,通过改变硝酸银浓度和用量,获得了银层连续致密、导电性良好的镀银纤维。(2)用溶液铺膜法分别制备了纳米二氧化硅纤维/PVDF复合膜和镀银纳米二氧化硅纤维/PVDF复合膜,通过FTIR、XRD、SEM、DSC、四探针测试仪等研究镀银的二氧化硅纤维对聚偏氟乙烯的晶体结构和性能的影响。结果表明,添加镀银纤维的复合膜的β和γ晶含量更高,电性能也更好。
[Abstract]:Polyvinylidene fluoride (PVDF) has been widely used in electronic and biomedical fields because of its excellent piezoelectric, thermoelectric and physical and chemical properties. PVDF is a semi-crystalline polymer with five crystalline forms. Different crystal structure will make PVDF materials exhibit different properties. Electrostatic spinning is a simple and effective method for preparing nano-scale fibers. Nano-silica fibers were prepared by electrospinning method. The surface of nano-silica fibers was treated by dopamine biomimetic modification at room temperature, and then electroless silver plating was carried out. Nano-silver coated silica fiber / PVDF composite film was prepared by solution coating method. The crystallization mechanism of PVDF was discussed. The effect of silver plating on the crystalline structure and properties of PVDF was investigated. The main contents of this thesis are as follows: (1) Nano-silica fibers were prepared by electrospinning technique. The fibers with rough surface and uniform deposition of polydopamine were obtained. Using glucose as reducing agent and polyvinylpyrrolidone (PVP) as stabilizer and dispersant, electroless silver plating on polydopamine fibers was carried out. The continuous densification of silver layer was obtained by changing the concentration and amount of silver nitrate. (2) Nano-silica fiber / PVDF composite film and silver-plated nano-silica fiber / PVDF composite film were prepared by solution coating method. The effect of silver-plated silica fiber on the crystal structure and properties of polyvinylidene fluoride (PVDF) was investigated by four-probe tester. The results show that the content of 尾 and 纬 crystals is higher and the electrical properties of the composite films are better.
【学位授予单位】:北京化工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TQ340.64;TB383.2
本文编号:2347470
[Abstract]:Polyvinylidene fluoride (PVDF) has been widely used in electronic and biomedical fields because of its excellent piezoelectric, thermoelectric and physical and chemical properties. PVDF is a semi-crystalline polymer with five crystalline forms. Different crystal structure will make PVDF materials exhibit different properties. Electrostatic spinning is a simple and effective method for preparing nano-scale fibers. Nano-silica fibers were prepared by electrospinning method. The surface of nano-silica fibers was treated by dopamine biomimetic modification at room temperature, and then electroless silver plating was carried out. Nano-silver coated silica fiber / PVDF composite film was prepared by solution coating method. The crystallization mechanism of PVDF was discussed. The effect of silver plating on the crystalline structure and properties of PVDF was investigated. The main contents of this thesis are as follows: (1) Nano-silica fibers were prepared by electrospinning technique. The fibers with rough surface and uniform deposition of polydopamine were obtained. Using glucose as reducing agent and polyvinylpyrrolidone (PVP) as stabilizer and dispersant, electroless silver plating on polydopamine fibers was carried out. The continuous densification of silver layer was obtained by changing the concentration and amount of silver nitrate. (2) Nano-silica fiber / PVDF composite film and silver-plated nano-silica fiber / PVDF composite film were prepared by solution coating method. The effect of silver-plated silica fiber on the crystal structure and properties of polyvinylidene fluoride (PVDF) was investigated by four-probe tester. The results show that the content of 尾 and 纬 crystals is higher and the electrical properties of the composite films are better.
【学位授予单位】:北京化工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TQ340.64;TB383.2
【参考文献】
相关期刊论文 前8条
1 高悦;梁永日;温世鹏;刘月星;刘力;;压电聚偏氟乙烯纳米纤维的应用进展[J];高分子材料科学与工程;2016年05期
2 孙桂岩;朱婵媛;张悦;石贺丹;王锦鹏;蔡以兵;刘伟;;SiO_2纳米纤维的制备及其对亚甲基蓝染料的吸附脱色性能[J];材料导报;2014年S2期
3 李鑫;方小峰;李健生;孙秀云;沈锦优;韩卫清;王连军;;纳米Ag粒子原位杂化PVDF超滤膜的抗污染性能[J];环境科学学报;2014年03期
4 朱元超;温世鹏;徐日炜;张立群;刘力;;静电纺丝制备SiO_2短纤维对聚丙烯冲击性能的影响[J];高等学校化学学报;2010年10期
5 梁先文;于淑会;孙蓉;罗遂斌;庄志强;;正硅酸乙酯改性的银填充聚偏二氟乙烯介电复合材料的制备及性能研究[J];绝缘材料;2010年04期
6 张宇洁;赵竹第;于文学;;聚偏氟乙烯/碳纳米管纳米复合材料的制备和表征[J];高分子材料科学与工程;2010年06期
7 刘淼;崔启征;王进贤;董相廷;;静电纺丝技术制备二氧化铈纳米纤维[J];长春工业大学学报(自然科学版);2008年06期
8 任杰;王林;张诚;;VGCF填充PVDF/PMMA复合材料导电性能的研究[J];塑料工业;2007年05期
,本文编号:2347470
本文链接:https://www.wllwen.com/guanlilunwen/gongchengguanli/2347470.html