PANI和MWCNT改性PVDF薄膜环境稳定性的影响研究

发布时间：2018-11-13 12:57

【摘要】：本文选用聚偏氟乙烯(PVDF)为基体,以聚苯胺(PANI)和多壁碳纳米管(MWCNT)为导电填料,将PVDF/PANI、PVDF/MWCNT、PVDF/PANI/MWCNT这三种复合薄膜分别放入真空紫外环境、原子氧环境及二者的协同环境中进行地面模拟空间辐照试验,通过对辐照后薄膜的电学性能、力学性能以及晶体结构、表面形态等的研究,来探讨空间辐照效应对复合薄膜质量损失、性能和结构的影响。研究结果表明,PVDF/PANI复合薄膜经过空间辐照后,质量损失增大,力学性能退化,断裂强度下降。真空紫外和原子氧辐照效应使复合薄膜的介电常数下降,介电损耗系数和电导率升高;而真空紫外和原子氧的协同辐照效应使复合薄膜的介电常数下降,介电损耗系数和电导率随辐照时间的增加而下降。PVDF/MWCNT复合薄膜经过空间辐照后,质量损失小于同时间内PVDF/PANI复合薄膜的质损;力学性能退化,断裂强度下降;辐照后薄膜晶型衍射峰的相对强度减弱;辐照效应使薄膜表面形态发生变化。真空紫外效应使复合薄膜的介电常数、介电损耗系数和电导率上升;原子氧辐照、真空紫外和原子氧的协同辐照效应使复合薄膜的介电常数、介电损耗系数及电导率均小于未辐照薄膜。PVDF/PANI/MWCNT三相复合薄膜在经过空间辐照后,相较于前两种复合薄膜,质量损失居中。单一真空紫外辐照效应和单一原子氧辐照效应使薄膜的介电常数、介电损耗系数及电导率下降,力学性能退化,辐照表面出现孔洞和褶皱;而真空紫外和原子氧的协同辐照效应加剧了复合薄膜表面形态的变化,表面变得更加粗糙,出现裂纹,介电损耗系数及电导率辐照后下降而介电常数却增大。
[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.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2

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