【摘要】：本文選用聚偏氟乙烯(PVDF)為基體,以聚苯胺(PANI)和多壁碳納米管(MWCNT)為導(dǎo)電填料,將PVDF/PANI、PVDF/MWCNT、PVDF/PANI/MWCNT這三種復(fù)合薄膜分別放入真空紫外環(huán)境、原子氧環(huán)境及二者的協(xié)同環(huán)境中進(jìn)行地面模擬空間輻照試驗(yàn),通過(guò)對(duì)輻照后薄膜的電學(xué)性能、力學(xué)性能以及晶體結(jié)構(gòu)、表面形態(tài)等的研究,來(lái)探討空間輻照效應(yīng)對(duì)復(fù)合薄膜質(zhì)量損失、性能和結(jié)構(gòu)的影響。研究結(jié)果表明,PVDF/PANI復(fù)合薄膜經(jīng)過(guò)空間輻照后,質(zhì)量損失增大,力學(xué)性能退化,斷裂強(qiáng)度下降。真空紫外和原子氧輻照效應(yīng)使復(fù)合薄膜的介電常數(shù)下降,介電損耗系數(shù)和電導(dǎo)率升高;而真空紫外和原子氧的協(xié)同輻照效應(yīng)使復(fù)合薄膜的介電常數(shù)下降,介電損耗系數(shù)和電導(dǎo)率隨輻照時(shí)間的增加而下降。PVDF/MWCNT復(fù)合薄膜經(jīng)過(guò)空間輻照后,質(zhì)量損失小于同時(shí)間內(nèi)PVDF/PANI復(fù)合薄膜的質(zhì)損;力學(xué)性能退化,斷裂強(qiáng)度下降;輻照后薄膜晶型衍射峰的相對(duì)強(qiáng)度減弱;輻照效應(yīng)使薄膜表面形態(tài)發(fā)生變化。真空紫外效應(yīng)使復(fù)合薄膜的介電常數(shù)、介電損耗系數(shù)和電導(dǎo)率上升;原子氧輻照、真空紫外和原子氧的協(xié)同輻照效應(yīng)使復(fù)合薄膜的介電常數(shù)、介電損耗系數(shù)及電導(dǎo)率均小于未輻照薄膜。PVDF/PANI/MWCNT三相復(fù)合薄膜在經(jīng)過(guò)空間輻照后,相較于前兩種復(fù)合薄膜,質(zhì)量損失居中。單一真空紫外輻照效應(yīng)和單一原子氧輻照效應(yīng)使薄膜的介電常數(shù)、介電損耗系數(shù)及電導(dǎo)率下降,力學(xué)性能退化,輻照表面出現(xiàn)孔洞和褶皺;而真空紫外和原子氧的協(xié)同輻照效應(yīng)加劇了復(fù)合薄膜表面形態(tài)的變化,表面變得更加粗糙,出現(xiàn)裂紋,介電損耗系數(shù)及電導(dǎo)率輻照后下降而介電常數(shù)卻增大。
[Abstract]:In this paper, polyvinylidene fluoride (PVDF) as substrate, Polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) as conductive fillers, three kinds of PVDF/PANI,PVDF/MWCNT,PVDF/PANI/MWCNT composite films were placed in vacuum ultraviolet environment, respectively. Ground simulated space irradiation experiments were carried out in atomic oxygen environment and their synergistic environment. The electrical properties, mechanical properties, crystal structure and surface morphology of irradiated films were studied. To study the effects of space irradiation on the mass loss, properties and structure of composite films. The results show that the mass loss increases, the mechanical properties degenerate and the fracture strength decreases after the PVDF/PANI composite films are irradiated in space. The dielectric constant of the composite films was decreased and the dielectric loss coefficient and conductivity increased due to the effects of vacuum ultraviolet and atomic oxygen irradiation. The synergistic irradiation effect of vacuum ultraviolet and atomic oxygen makes the dielectric constant of the composite film decrease, and the dielectric loss coefficient and conductivity decrease with the increase of irradiation time. After the PVDF/MWCNT composite film is irradiated in space, the dielectric loss coefficient and conductivity decrease with the increase of irradiation time. The mass loss of PVDF/PANI composite film is smaller than that of PVDF/PANI composite film in the same time. The mechanical properties degenerate, the fracture strength decreases, the relative strength of the diffraction peak decreases after irradiation, and the surface morphology of the film changes due to the irradiation effect. The vacuum ultraviolet effect increases the dielectric constant, dielectric loss coefficient and conductivity of the composite films. The co-irradiation effect of atomic oxygen irradiation, vacuum ultraviolet and atomic oxygen makes the dielectric constant, dielectric loss coefficient and conductivity of the composite thin film smaller than that of the unirradiated film. After the PVDF/PANI/MWCNT three-phase composite film is irradiated in space, the dielectric constant of the composite film is lower than that of the unirradiated film. Compared with the first two kinds of composite films, the mass loss is in the middle. The single vacuum ultraviolet irradiation effect and the single atomic oxygen irradiation effect decrease the dielectric constant, dielectric loss coefficient and conductivity, degenerate the mechanical properties, and cause holes and folds on the irradiated surface. The co-irradiation effect of vacuum ultraviolet and atomic oxygen intensifies the change of the surface morphology of the composite film. The surface becomes rougher and cracks occur. The dielectric loss coefficient and conductivity decrease but the dielectric constant increases after irradiation.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB383.2

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本文編號(hào)：2329170