紫外光固化法制备漆酚/铜复合导电涂料及其性能的研究

以漆酚为基体,铜为导电填料,利用紫外光固化法制备漆酚/铜复合导电涂料,讨论了涂膜中铜的含量对漆膜导电性能的影响,并测试了漆膜的常规物理机械性能和耐化学腐蚀性能。结果表明,在紫外光辐照下,漆酚/铜混合物涂膜可快速固化。当铜含量达到45%(wt%)时,漆膜的表面电阻率为13.1Ω·cm,耐冲击强度50kg·cm。     

紫外光固化法制备漆酚铁聚合物涂料的研究

通过紫外光固化法快速便捷地由漆酚和三氯化铁制备了色泽乌黑、表面平整光亮的漆酚铁聚合物。当漆酚和氯化铁的物质的量比为3∶1,紫外光辐照20s时,漆膜具有优良的常规物理机械性能:光泽度132%,硬度6H,冲击强度50kg.cm,柔韧性0.5mm,附着力1级;良好的抗紫外线性能:紫外光辐照1200h以后,其失光率仅为4.85%;良好的耐热性能:受热320℃时失重5%;优异的抗化学介质性能。     

非金属电镀用导电漆的研制

介绍了导电漆、作为导电填料的片状镀银铜粉的制备工艺流程。分别研究了漆膜表面单位电阻与镀银铜粉的含量及其粒径以及钛酸酯偶联剂的含量之间的关系。结果表明,当镀银铜粉的粒径为400目、质量分数在57%~65%之间,钛酸酯偶联剂的质量分数为10%时,所得涂膜的导电性能最佳。加入含C-18的油酸可以使导电漆长期贮存而电阻值不变。经检测,所得涂膜具有良好的性能:附着力1级,硬度1 H,柔韧性1 mm,冲击强度50 kg/cm2,膜厚10~15μm,漆膜表面每厘米电阻0.15Ω,每分米电阻0.47Ω。指出了导电漆应用过程中的注意事项。     

紫外光固化漆酚基纳米复合涂料性能的对比分析

将紫外光固化技术与有机/无机纳米杂化材料制备技术相结合,以可再生天然生漆为主要原料,制得了紫外光固化漆酚和紫外光固化漆酚基纳米SiO_2/TiO_2/ZnO/OMMT的4种复合涂料。对比分析了其与漆酚甲醛缩聚物的常规物理机械性能、抗紫外线性能、抗溶剂性和耐化学介质性能。结果表明,紫外光固化漆酚和以其为基础的4种纳米复合涂料的各项性能均较漆酚甲醛缩聚物有较大提高。     

热固化法制备癸二胺/漆酚膜及其性能研究

利用癸二胺(DMDA)与漆酚混合反应,在120℃高温条件下固化,得到癸二胺/漆酚热固化膜,探究不同比例的癸二胺对漆膜性能的影响。通过傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、热重分析(TG)等方法对漆膜进行表征,结果表明：热固化条件下,癸二胺与漆酚发生交联反应,使漆膜表面平整致密,热稳定性和耐碱性得到提升。同时物理机械性能也得到改善,当癸二胺添加量为10%时,铅笔硬度、耐冲击性分别为6H、65cm。     

高性能酚醛树脂/石墨双极板导电复合材料的制备

以酚醛树脂与石墨粉料为原料,通过热模压成形得到一种质子交换膜燃料电池双极板材料.研究了酚醛树脂含量、石墨粒径和固化温度对复合材料导电性能与弯曲强度的影响.结果表明随酚醛树脂含量的增加,导电性能降低,强度升高;随石墨粒径的增大,复合材料的导电性能和弯曲强度呈现先增大后减小的趋势;随固化温度的增加,导电性能出现明显波动,而弯曲强度呈先增大后减小的趋势;酚醛树脂质量分数为15%,石墨颗粒粒径为105 μm,固化温度为240℃时,导电复合材料的电导率和弯曲强度可达142 S/cm,61.6 MPa.     

生漆的组成结构与其性能的关系研究

本文简述了生漆成膜的物质基础及成膜特征 ,分析了生漆涂膜性能与其结构的关系 ,认为生漆涂膜中漆酚多聚体及其漆酚—多糖—糖蛋白的高分子复合物结构 ,决定了生漆漆膜的性能 ,生漆与其它涂料相比 ,既有共性 ,但不乏独创之处 ,为合成新型功能复合涂料提供了许多可借鉴之处     

紫外光固化漆酚镧聚合物(PULa)的性能与表征

由漆酚和氯化镧的酒精溶液,采用紫外光固化制备漆酚镧聚合物(PULa),用紫外可见光谱,红外光谱,热重分析等手段进行结构表征和性能测试。结果表明:紫外光固化得到的漆酚镧聚合物(PULa)膜具有良好的柔韧性能、抗冲击性、热稳定性能和抗溶剂性能。     

醛酮树脂在紫外光固化色漆中的应用研究

在紫外光固化色漆体系中选用醛酮树脂参与辅助成膜物的紫外光固化涂料的研制。讨论了醛酮树脂对体系的颜料润湿性、成膜附着力、涂膜硬度、丰满度的影响。最后得出了选择合适醛酮树脂在紫外光固化色漆中应用可以提高漆膜附着力,改变硬度,增加漆膜的丰满度和体系的润湿性能。     

疏水性漆酚铁的制备及其性能研究

采用三氯化铁对氟树脂/漆酚复合体系进行改性,制备出疏水性的漆酚铁涂膜,并测试其热性能、抗紫外线性能、物理机械性能、耐酸碱性能,采用红外光谱和DSC对该共混体系进行结构表征。结果表明,漆酚铁复合材料与氟树脂/漆酚复合材料相比,具有优异的疏水性能和抗紫外线性能,固化方法简单,附着力和柔韧性有了很大的提高,并具有很好的抗冲击性能。     

聚酰亚胺/导电石墨抗静电复合材料的制备与表征

采用原位聚合法制备了聚酰亚胺/导电石墨(PI/CG)抗静电复合材料薄膜,并探讨了复合膜的结构、微观形貌以及导电石墨用量对其表面电阻率、热性能以及力学性能的影响。结果表明:复合膜亚胺化完全、热性能得到提高;石墨的用量为15 phr时,复合膜表面电阻率的数量级为109Ω,达到抗静电的最佳要求范围。     

Characterization and conductive property of polyurushiol/silver conductive coatings prepared under UV irradiation

Polyurushiol/silver (PU/Ag) composite conductive coatings were prepared from urushiol and AgNO₃ under UV irradiation by using in situ radical reduction approach. The effects of the silver nitrate loading and the irradiation time on the surface resistivity of polyurushiol/silver (PU/Ag) composite films were investigated. The result from XRD analysis showed that the formation of Ag particles, and the surface resistivity of polyurushiol/silver (PU/Ag) composite films reached the value of 0.26 Ω cm, when the content of Ag particles in composite films was 23.8 wt%, and the irradiation time 90 s. Additionally, Ag particles were well dispersed in the composite films. And the films had good thermo-stability.     

Wettability and switching of electrical conductivity in UV irradiated graphene oxide films

Graphene oxide (GO) flakes were assembled into a thin film that was subsequently exposed to UV light. It was found that pristine hydrophilic and insulating GO films present a poorer wettability together with a decrease of their surface resistivity under UV irradiation. It was observed that the pristine hydrophilic and insulating properties can be restored after few hours from irradiation. Using infrared spectroscopy and micro-Raman spectroscopy, we study the relationship between surface chemistry and structural distortion of GO films before and after UV irradiation. The obtained results open a solvent free as well as easy route for the integration of GO based materials into optoelectronic devices.     

Nonlinear surface electrical resistivity of graphite–polyurethane composite films

In this article, we study the surface resistivity of graphite–polyurethane composites using voltage–current characteristics. The evolution of the percolation network of graphite in polyurethane is qualitatively studied using optical micrographs. As expected, the surface resistivity decreases as a function of graphite concentration. In particular, the surface resistivity of the 69% graphite–polyurethane composite is about four orders of magnitude lower than the surface resistivity of the 27% graphite–polyurethane composite. The electrical resistivity of the composite is found to be highly nonlinear with respect to an increasing voltage at a low graphite weight fraction. On the other hand, the nonlinearity is significantly milder at higher weight fractions. The reasons behind the nonlinearity are discussed. Very preliminary studies indicate that very low weight fractions of single wall carbon nanotubes (e.g. 2.5%) are sufficient to generate electrical conductivities comparable to much higher loading fractions (～ 60% and higher) of the heavier graphite particles. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Effect of γ‐ray irradiation on morphology and electrical properties of poly(vinyl chloride)/graphite composites

This article reports the effect of crosslinking by γ‐ray irradiation on the morphology, electrical properties, and hardness of poly(vinyl chloride)/graphite composite. A comparison of the scanning electron micrographs of the composites, before and after irradiation, showed that the filler particles were broken into pieces and distributed homogenously as a result of irradiation. The data of electrical conductivity versus graphite content was found to be consistent with the percolation model. A significant increase in the conductivity of composite was observed on the crosslinking of the polymer in consequence of irradiation. The data are correlated with the morphological changes. The study of electrical resistivity as a function of temperature revealed that the negative temperature coefficient of resistivity effect is considerably suppressed after irradiation. These results are explained on the basis of morphological changes in the composites after γ‐ray irradiation. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers     

表面改性对石墨/环氧复合材料介电性能的影响

通过共混法制备了环氧/石墨复合材料,用SEM表征表面形貌,探讨了石墨填充量、石墨表面改性等对复合材料介电性的影响。发现石墨能通过渗流效应提高环氧树脂的常数,表面改性剂对石墨的介电性能有明显影响。制备得到一种介电常数达164、介电损耗为0.14、体积电阻率为1.5×10~10Ω·cm的高介常低介损复合材料,为工业化生产低成本高储能密度电容器提供新思路。     

γ射线辐射法制备石墨/镍复合材料及其电磁性能

为提高鳞片状石墨在电磁波吸收方面的应用性能,采用γ辐射一步法制备了鳞片状石墨/镍复合材料。实验在常温常压下进行,将鳞片状石墨置于镍盐溶液内,控制溶液的镍盐浓度,再加入氧化性自由基清除剂并将该混合溶液置于钴60辐照室辐照,获得了纳米金属镍包覆在鳞片状石墨表面的复合材料。通过XRD、SEM对复合材料进行了结构和形貌的表征,复合材料为核壳结构、由纯纳米镍与石墨构成,同时提出了γ辐射法合成该复合材料的复合机理,并且研究了复合材料在2～18GHz频段的电磁性能。     

Effect of Quasi‐nanometer zirconium carbide on the physical characterization of zirconium carbide/polyurethane composite films irradiated under ultraviolet light

We used quasi‐nanometer zirconium carbide (ZrC) and a polyurethane (PU) resin under roller pressure to form a composite film and found that the tensile strength at break, elongation at break, and modulus gradually decreased with increasing ultraviolet (UV)‐irradiation time for films of both PU and the PU/ZrC composite. However, this phenomenon was significantly higher for the PU film than for the ZrC/PU composite film. The construction of the PU film changed after UV irradiation, but that of the PU/ZrC composite film was almost unchanged. The degradation of PU molecules occurred in the absence of ZrC particles after irradiation with UV light but almost did not occur in the presence of ZrC particles. This was confirmed with Fourier transform infrared spectroscopy and gel permeation chromatography analyses. It was suggested that polymer radicals which formed through the photooxidation of UV irradiation and free radicals which formed through the photoreduction of nanometer ZrC/UV irradiation interacted to form a dead polymer to stop the degradation; simultaneously, the chemical bonding between polymer molecules could be re‐formed from free radicals created by photooxidation and photoreduction and thus reduce the mobility of PU molecules, thereby raising the glass‐transition and melting temperatures of the soft segment. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4842–4849, 2006     

Electroactive polymer patterns with metal incorporation on a polymeric substrate

Electroactive polymer patterns on a polymeric substrate were fabricated using either a UV lithographic approach or plasma polymerization method. For the lithographic patterning technique, photosensitive thin films comprising polyaniline (PANI) coatings on viologen‐grafted low‐density polyethylene (LDPE) substrates were first prepared. The composite film was subsequently exposed to UV irradiation through a mask. Under UV irradiation, reactions between PANI and viologen occurred, resulting in the conversion of the PANI to a doped state. The PANI micropatterns were developed by using N‐methylpyrrolidinone (NMP) to dissolve the soluble‐unexposed (and hence undoped) parts. The use of Ar plasma treatment of the composite film instead of UV irradiation was not successful in inducing the doping reaction between PANI and viologen. On the other hand, plasma polymerization was shown to be another convenient way for the selective surface deposition of aniline polymer on the surface of the LDPE substrate through a mask. The further incorporation of metal/metal ions in both the PANI‐viologen and plasma polymerized aniline system was successfully carried out on the micropatterns. Polym. Eng. Sci. 44:2061–2069, 2004. © 2004 Society of Plastics Engineers.