本文關鍵詞：高介電聚偏氟乙烯基復合材料的研究　出處：《江蘇大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 聚偏氟乙烯 石墨烯 鈦酸鍶鋇 碳納米管 復合材料 介電性能

【摘要】：隨著電子集成技術的飛速發(fā)展以及電子工業(yè)領域的巨大需求,對電介質材料的要求越來越高。這不僅要求材料具有較好的介電性能,還要具備良好的加工性能和輕質化的特點。如何制備出性能優(yōu)異并且工藝簡單具有產(chǎn)業(yè)化價值的高性能介電材料成為當今介電材料的研究重點。傳統(tǒng)的鐵電陶瓷和單一的高分子材料均不能滿足要求。因此,聚合物基體的高介電復合材料逐漸成為研究的熱點。本文通過溶液混合流延法制備了一系列聚偏氟乙烯為基體的復合材料,研究了填料的表面結構、分散性能以及與聚合物的界面相容性對復合材料介電性能的影響。通過對鈦酸鍶鋇和石墨烯填料的表面改性,改善了它們在聚偏氟乙烯基體中的分散性和界面結構,提高了介電性能。并同時摻入碳納米管和石墨烯材料,進一步提升了復合材料的介電性能。論文的主要研究內容和結果如下:(1)用溶液混合流延法制備PVDF薄膜,探求PVDF與DMF的最佳質量比。研究發(fā)現(xiàn),當PVDF:DMF質量比為1:10時,所制備出的薄膜介電常數(shù)最大約為10,介電損耗最低為0.018。(2)制備BST的體積分數(shù)為30%的BST/PVDF二元復合薄膜,探究薄膜厚度對復合薄膜介電性能的影響。研究發(fā)現(xiàn),當薄膜厚度為0.070mm時,介電常數(shù)最大,為36。薄膜厚度為0.176mm時,介電損耗最低,為0.026。(3)用硅烷偶聯(lián)劑(KH550)對鈦酸鍶鋇和石墨烯進行表面改性,將硅烷偶聯(lián)劑接枝到鈦酸鍶鋇與石墨烯的表面。在此基礎上制備摻入改性石墨烯和改性鈦酸鍶鋇的Graphene/BST/PVDF三元復合材料。研究發(fā)現(xiàn),當石墨烯含量達到滲流閾值4.0wt%附近時,復合薄膜的介電常數(shù)與介電損耗都會發(fā)生突變,引發(fā)了滲流效應。當改性石墨烯的摻入量為4.06wt%時,100Hz下復合材料的介電常數(shù)為502,介電損耗為0.506。(4)將多巴胺包覆在石墨烯表面形成一層均勻包覆層,可以改善其與PVDF基體的界面相容性,并在石墨烯表面形成絕緣層,阻止片層之間的直接接觸,有效減少漏電流。研究發(fā)現(xiàn),包覆多巴胺后石墨烯在DMF溶液中的分散性得到大幅改善。在此基礎上制備的Graphene/BST/PVDF三元復合材料介電損耗明顯減小。當石墨烯摻入量為9.08wt%時,100Hz下薄膜的介電常數(shù)為494,介電損耗為0.321。(5)為了獲得介電性能更加優(yōu)異、綜合性能更加穩(wěn)定的復合薄膜,將羧基化多壁碳納米管分別和兩種改性后的石墨烯復合摻雜,通過合理控制兩者之間的摻雜比例,得到了介電性能更加優(yōu)異的復合薄膜材料。兩種導電粒子的復合摻雜大幅降低了導電相的摻入量,改善了漿料的制備性能,并且兩者的協(xié)同作用也降低了復合材料的介電損耗。碳納米管與硅烷偶聯(lián)劑改性石墨烯的加入量分別為0.8wt%和0.2 wt%時,Graphene/MWCNT/BST/PVDF復合材料的介電常數(shù)427,介電損耗0.395;碳納米管與多巴胺包覆石墨烯的加入量分別為0.8 wt%和0.4 wt%時,Graphene/MWCNT/BST/PVDF復合材料的介電常數(shù)457,介電損耗0.323。
[Abstract]:With the rapid development of electronic integration technology and the huge demand in the field of electronic industry, the demand for dielectric materials is becoming higher and higher, which not only requires better dielectric properties of materials. How to prepare high performance dielectric materials with excellent properties and simple industrial value has become the research focus of dielectric materials nowadays. Traditional ferroelectric ceramics. And a single polymer material can not meet the requirements. High dielectric composites of polymer matrix have gradually become the focus of research. In this paper, a series of polyvinylidene fluoride matrix composites were prepared by solution mixing casting method, and the surface structure of filler was studied. The influence of dispersion property and interfacial compatibility with polymer on the dielectric properties of composites were investigated by surface modification of barium strontium titanate and graphene filler. The dispersion and interface structure in PVDF matrix were improved, the dielectric properties were improved, and carbon nanotubes and graphene materials were added. The dielectric properties of the composites were further improved. The main research contents and results are as follows: 1) PVDF thin films were prepared by solution mixing casting method. The optimum mass ratio of PVDF to DMF was investigated. It was found that when the mass ratio of PVDF:DMF was 1:10, the maximum dielectric constant of the films was about 10. The lowest dielectric loss is 0.018. 2) BST/PVDF binary composite films with volume fraction of 30% were prepared by BST. The effect of film thickness on the dielectric properties of the composite films was investigated. When the thickness of the film is 0.070 mm, the dielectric constant is the highest, which is 36. When the thickness of the film is 0.176 mm, the dielectric loss is the lowest. The surface modification of barium strontium titanate and graphene was carried out by silane coupling agent KH 550. The silane coupling agent was grafted onto the surface of barium strontium titanate and graphene. On this basis, Graphene/BST/PVDF ternary composites with modified graphene and modified barium strontium titanate were prepared. Right now. When the content of graphene reaches the percolation threshold of 4.0 wt%, the dielectric constant and dielectric loss of the composite film will change. The percolation effect was initiated. When the content of modified graphene was 4.06 wt%, the dielectric constant of the composite was 502 at 100 Hz. The dielectric loss is 0.506.06.0.The dopamine is coated on the surface of graphene to form a uniform coating, which can improve the interface compatibility with the PVDF matrix and form an insulating layer on the graphene surface. Direct contact between layers is prevented and leakage current is effectively reduced. The dispersion of graphene in DMF solution was greatly improved after the coating of dopamine. The dielectric loss of Graphene/BST/PVDF ternary composites prepared on this basis was obviously reduced. When the content of enene was 9.08 wt%. The dielectric constant and dielectric loss of the films at 100 Hz are 494 and 0.321.5) in order to obtain more excellent dielectric properties and more stable comprehensive properties of the composite films. Carboxylated multi-walled carbon nanotubes and two kinds of modified graphene were doped respectively and the doping ratio between them was controlled reasonably. The composite films with better dielectric properties were obtained. The composite doping of two kinds of conductive particles greatly reduced the amount of conductive phase and improved the preparation performance of the slurry. The synergistic effect also reduced the dielectric loss of the composites. When the addition of carbon nanotubes and silane coupling agent modified graphene was 0.8 wt% and 0.2 wt% respectively. The dielectric constant of Graphene/MWCNT/BST/PVDF composites is 427 and the dielectric loss is 0.395; The addition of carbon nanotubes and dopamine coated graphene was 0.8 wt% and 0.4 wt% respectively. The dielectric constant and dielectric loss of Graphene/MWCNT/BST/PVDF composites are 457 and 0.323, respectively.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332

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