本文選題：聚二甲基硅氧烷(PDMS)　切入點：斷裂韌性　出處：《浙江大學》2017年碩士論文　論文類型：學位論文

【摘要】：聚二甲基硅氧烷(PDMS)是一種廣泛用于柔性電子領域的高分子聚合物,以其獨特的光學透明性、良好的柔性、化學惰性和形狀復制能力在微納米器件轉印、柔性電路基底制備等方面發(fā)揮了重要作用。PDMS雖然具有良好的彈性,但是其斷裂韌性較差,在存在缺陷(如裂紋)時,極易發(fā)生破壞,這極大地限制了PDMS的工程應用。本文針對PDMS的裂紋敏感這一缺陷,選用了兩種組成成分分別為錦綸和氨綸包芯絲的高韌性平針緯編纖維織物作為增韌材料,與PDMS進行復合來提升斷裂韌性,進而拓寬它在柔性電子器件中的使用范圍。本文采用直接涂布法制備纖維織物/PDMS復合材料,分別對兩種平針緯編織物以及相應的復合材料沿織物結構的橫、縱兩個方向進行單向拉伸測試,并分析兩種織物及相應的復合材料在橫、縱方向的力學性能差異,同時與PDMS試樣進行比較。實驗結果表明,兩種纖維織物/PDMS復合材料在橫、縱向拉伸下的彈性.模量、斷裂強力、斷裂強度以及斷裂伸長率比PDMS都有不同程度的提升,其中橫向錦綸織物復合材料具有較好的力學穩(wěn)定性。在裂紋擴展方面,本文分別對PDMS、兩種增韌織物以及相應復合材料的單邊切口拉伸試樣進行了單向拉伸測試。實驗結果表明,對于引入預裂紋的增韌織物,錦綸織物的橫縱向試樣以及氨綸織物的縱向試樣能夠較好得抵抗裂紋擴展。對于復合材料,發(fā)現(xiàn)織物增韌之后的四種復合材料斷裂韌性與PDMS相比,均有明顯提高,其中橫向錦綸復合材料的提升最大,斷裂韌性提升率高達700%。此外,本文還對復合材料在有裂紋情況下的加卸載性能進行了分析。這些結果為制備對裂紋不敏感的柔性電子基底材料奠定了實驗基礎。
[Abstract]:Poly (dimethylsiloxane) (PDMS) is a kind of polymer widely used in the field of flexible electronics. With its unique optical transparency, good flexibility, chemical inertia and shape replication ability, it is widely used in the transfer printing of micro and nano devices. Although PDMS has good elasticity, its fracture toughness is poor, and it is easy to destroy when there are defects (such as cracks). This greatly limits the engineering application of PDMS. In view of the flaw of crack sensitivity in PDMS, two kinds of high toughness plain weft knitted fabrics, which are nylon and spandex cored yarn, are selected as toughening materials. In order to improve the fracture toughness and expand the application range of PDMS in flexible electronic devices, the fiber fabric / PDMS composite was prepared by direct coating method. The uniaxial tensile tests of two kinds of plain weft knitted fabrics and corresponding composites along the transverse and longitudinal directions of fabric structure were carried out, and the differences of mechanical properties of the two fabrics and their corresponding composites in the transverse and longitudinal directions were analyzed. The results show that the elastic modulus, tensile strength, breaking strength, breaking strength and elongation at break of the two kinds of fiber fabrics / PDMS composites under transverse and longitudinal tension are increased by different degrees than those of PDMS. In the aspect of crack propagation, uniaxial tensile tests of PDMS, two kinds of toughened fabrics and unilateral notch tensile specimens of the corresponding composites were carried out. For the toughened fabric with pre-crack, the transverse and longitudinal specimens of nylon fabric and the longitudinal specimen of spandex fabric can better resist the crack propagation. For the composite material, it is found that the fracture toughness of the four composites after toughening is compared with that of PDMS. Among them, the transverse polyamide composite has the largest lift, and the fracture toughness rate is as high as 700. In addition, In this paper, the loading and unloading properties of composites with cracks are also analyzed. These results provide an experimental basis for the preparation of crack insensitive flexible electronic substrates.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332

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本文編號：1566814