【摘要】：聚偏氟乙烯(PVDF)因其優(yōu)異的壓電、熱電等電性能和良好的物理化學(xué)方面的性能,在電子和生物醫(yī)學(xué)等領(lǐng)域有著廣泛的應(yīng)用。PVDF是含有五種晶型的半結(jié)晶性的聚合物,不同的晶體結(jié)構(gòu)會(huì)使PVDF材料表現(xiàn)出不相同的性能。靜電紡絲技術(shù)是制備納米尺度的纖維的簡(jiǎn)單而又有效的方法。本文通過(guò)靜電紡絲方法制備了納米二氧化硅纖維,通過(guò)多巴胺的仿生修飾在室溫條件下對(duì)其進(jìn)行表面處理,然后進(jìn)行化學(xué)鍍銀。用溶液鋪膜法制備了納米鍍銀二氧化硅纖維/PVDF復(fù)合膜,探討了 PVDF的結(jié)晶機(jī)理,考察了二氧化硅纖維鍍銀后對(duì)PVDF結(jié)晶結(jié)構(gòu)及性能的影響。本論文的主要研究?jī)?nèi)容如下:(1)通過(guò)靜電紡絲技術(shù)制備了納米二氧化硅纖維,用多巴胺對(duì)其進(jìn)行表面仿生修飾,通過(guò)改變多巴胺用量,獲得了表面粗糙且聚多巴胺沉積均勻的纖維;以葡萄糖作為還原劑,聚乙烯吡咯烷酮(PVP)作穩(wěn)定劑和分散劑,對(duì)沉積聚多巴胺的纖維進(jìn)行化學(xué)鍍銀,通過(guò)改變硝酸銀濃度和用量,獲得了銀層連續(xù)致密、導(dǎo)電性良好的鍍銀纖維。(2)用溶液鋪膜法分別制備了納米二氧化硅纖維/PVDF復(fù)合膜和鍍銀納米二氧化硅纖維/PVDF復(fù)合膜,通過(guò)FTIR、XRD、SEM、DSC、四探針測(cè)試儀等研究鍍銀的二氧化硅纖維對(duì)聚偏氟乙烯的晶體結(jié)構(gòu)和性能的影響。結(jié)果表明,添加鍍銀纖維的復(fù)合膜的β和γ晶含量更高,電性能也更好。
[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 緯 crystals is higher and the electrical properties of the composite films are better.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ340.64;TB383.2

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