用反胶束法合成感光聚酰亚胺/SiO2纳米复合材料

用反胶束法使SiO2纳米粒子与感光聚酰亚胺溶液混合,制备纳米复合感光材料.用偏光显微镜表征了复合材料的光刻能力及形貌,用红外光谱表征了复合材料的结构,用DSC测定了复合材料的玻璃化转变温度.     

聚酰亚胺/纳米氧化硅氧化铝杂化膜的制备

研究了用溶胶凝胶法制得的二氧化硅及三氧化二铝溶胶,将其掺入到聚酰胺酸基体中,得到SiO2-Al2O3/聚酰亚胺杂化膜,并采用FTIR、SEM和TGA表征了所制备的杂化膜的结构微观形态和热性能。结果表明,薄膜材料中SiO2和Al2O3粒子分散均匀,与有机相存在键合,材料热分解温度有所提高。     

聚酰亚胺/无机纳米杂化材料的研究

聚酰亚胺是一种综合性能优异的材料,现已被广泛应用于航空航天及微电子领域.但是其明显的性能缺陷限制了其在高温和精密状态下的应用;而无机纳米粒子的引入,大大弥补了其性能缺陷（如较高的热膨胀系数和较低的吸水性）,非常适合对PI改性.本文阐述了PI纳米杂化材料的制备方法,介绍了纳米杂化材料的特点及应用.     

Polyimide/TiO2photosensitive hybrid materials

采用反胶束法合成TiO     

聚酰亚胺/二氧化钛杂化材料的制备及性能研究

采用超声分散-原位聚合工艺制备了聚酰亚胺(PI)/二氧化钛(TiO2)杂化膜。通过傅里叶转换红外光谱、紫外-可见光谱、扫描电子显微镜等对杂化膜进行了表征,探讨了杂化膜中TiO2含量对杂化膜的热性能、吸湿性能和力学性能的影响。结果表明,纳米TiO2粒子均匀分散在PI基体中,TiO2的掺入及与有机基体的杂化提高了材料的热分解温度与玻璃化转变温度,降低了材料的吸湿性能,改善了材料的力学性能。当TiO2含量为6%时,杂化膜的拉伸弹性模量和断裂强度达到最大值,分别为纯PI膜的2.17倍和1.63倍。     

无机纳米杂化聚酰亚胺薄膜的制备及性能研究

以聚酰胺酸作为基体，通过正硅酸乙酯（TEOS）和异丙醇铝发生水解缩合反应，然后与聚酰胺酸发生溶胶凝胶过程，从而制备出无机纳米掺杂聚酰亚胺薄膜。利用傅里叶红外光谱、热失质量、介电谱及击穿试验对其热性能和电性能进行表征和测试，考察了相应的结构与性能之间的关系。     

反胶束微乳液法制备纳米ZnO

以CTAB/煤油/正辛醇/氨水反胶束微乳体系,采用双微乳液混合法制备了纳米ZnO,考察了CTAB和反应物浓度对ZnO粒径的影响,利用TEM、XRD等手段对产品进行了表征。结果表明,所得纳米ZnO为球形六方晶体,粒径为20~70 nm,且分散性较好。     

水热晶化法制备TiO2纳米粉末

本文采用水热晶化法成功地合成了粒径为７ｎｍ的锐钛矿相ＴｉＯ２纳米粉末。研究了热处理温度对所得纳米ＴｉＯ２粉的影响，ＴｉＯ２纳米粉从２００℃至８００℃之间经历了锐钛矿—锐钛矿与金红石共存—金红石的相变。     

聚酰亚胺／纳米Al2O3-SiO2和聚酰亚胺／纳米Si3N4杂化材料的结构与性能研究

将纳米Al2O3-SiO2、Si3N4分别均匀分散于聚酰亚胺（PI）前驱体聚酰胺酸中，经过热亚胺化制备了PI／纳米Al2O3-SiO2和PI／纳米鼠N4杂化材料。通过傅里叶变换红外光谱仪、X射线衍射仪、高温微量热天平、静态热机械分析仪和差示热分析仪对杂化材料的微观结构及热性能进行了研究，结果表明，杂化材料中聚酰亚胺和无机纳米粒子之间存在相互作用，形成了复合相态结构；加入纳米Al2O3，SiO2、Si3N4后杂化材料的热稳定性均高于纯聚酰亚胺，但并不完全随无机纳米粒子含量的增加而提高；与纯PI相比，在90～130℃的温度范围内PI-8％Al2O3-SiO2、PI-8％鼠Si3N4热膨胀系数分别降低了约11％和47％，加入8％纳米Al2O3-SiO2、Si3N4后杂化材料的热导率分别提高了约8％和13％。PI／纳米Al2O3-SiO2、Si3N4杂化材料不仅保留了PI原有的优异性能，而且充分发挥了纳米无机粒子对PI的特殊改性性能。     

TiO2/MQ硅树脂反应型杂化材料的制备及其性能研究

以钛酸丁酯、MQ硅树脂为原料,利用溶胶-凝胶法制备了TiO2/MQ硅树脂无机-有机杂化材料.采用傅里叶变换红外光谱(FT - IR)、紫外-可见光谱、热重分析仪(TGA)、X-射线衍射仪(XRD)、扫描电镜(SEM)表征杂化材料的结构与性能.结果表明:杂化材料中存在Ti-O-Si共价键合;杂化材料对可见光吸收极低,对紫...     

Surface modification of TiO2 nanoparticles and preparation of TiO2/PDMS hybrid membrane materials

TiO₂ nanoparticles were surface‐modified by a convenient and mild sol–gel method. A novel hybrid membrane material was prepared by crosslinking reaction based on poly(dimethylsiloxane) (PDMS) as organic matrix and TiO₂ nanoparticles as inorganic filler as well as a crosslinking agent. The chemical structure, mechanical and thermal properties, swelling performance and morphology of the hybrid membranes were characterized and investigated by FTIR, SEM, TG, and so on. The results showed that the surface modification method could make the compatibility between organic component and inorganic component good. The ultrathin PDMS hybrid membrane could easily be prepared by crosslinking reaction at room temperature and the conventional solution casting method. The preparation technology enhanced forming‐membrane ability of the hybrid membrane, shortened reaction time, and decreased some by‐products. In addition, the stress at break and the elongation at break of the hybrid membranes increased significantly with increasing TiO₂ contents. The enhanced mechanical properties of the hybrid membranes will develop potential application of PDMS membranes. POLYM. COMPOS., 38:1541–1548, 2017. © 2015 Society of Plastics Engineers     

TiO_2聚合物基体杂化热释电材料的制备与性能研究

采用sol-gel方法制备了以改性直接大红4B偶氮染料为生色团,以钛酸正丁酯(TBOT)为无机前驱体的有机/无机杂化聚合物热释电材料。利用红外、紫外、差热分析、原子力等表征手段对该杂化材料进行了分析。结果表明,所制备的杂化材料取向稳定性好,且热释电性能在室温下较好,系数高达1.98×10-6C/cm2K。     

Synthesis and characterization of low‐dielectric photosensitive polyimide/silica hybrid materials

Photosensitive polyimide/silica hybrid materials were synthesized by reaction between 4,4′‐hexafluoroisopropylidene diphthalic anhydride (6FDA) and 4,4′‐oxydianiline. The intrachain chemical bonding and the interchain hydrogen bonding between the polyimide and silica moieties were increased by the incorporation of 2‐(dimethylamino) ethyl acrylate and 3‐aminopropyl trimetho xysilane, respectively. The photoinitiator was bis(2,4,6‐trimethyl benzoyl) phenylphosphine oxide (Irgacure‐819). The various coupling agents were utilized included tetrakis (allyloxy) silane (TAL). Most silica hybrid films showed better volume shrinkage and temperature resistance. The cooperation of octavinyl POSS, as the coupling agent, can lower dielectric constant (k) down to 2.48 but with the poorer volume shrinkage and temperature resistance than the other silica hybrid films. The addition of tetramethyl orthosilicate and 3‐methacryloxy propyltrimethoxysilane with silica content of 5.6 wt % can reduce k down to 2.26 but with worse volume shrinkage than the incorporation with TAL. The TAL hybrid film with degree of polymerization of 25 showed the best properties that optimized photolithography, dielectric constant (k = 3.81), volume shrinkage, and temperature resistance (Td5% = 378°C) with only 0.22 wt % silica content. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

聚丙烯酰胺／二氧化钛杂化材料的合成与表征

以丙烯酰胺为有机相,通过钛酸正丁酯的水解引入二氧化钛无机相,采用溶胶-凝胶法制备了聚丙烯酰胺（PAM）／二氧化钛（TiO2）水溶性高聚物杂化材料。讨论了二氧化钛溶胶质量分数、单体质量分数对聚合反应转化率的影响;对合成的杂化材料进行了红外、热性能表征。实验结果表明,二氧化钛包裹在聚丙烯酰胺内部,同时,合成的杂化材料耐热性能有所提高。     

TiO2/PVA杂化膜的渗透蒸发性能及结构表征

通过纳米TiO2粒子填充改性制备了新型TiO2/PVA杂化膜。红外光谱表明纳米TiO2表面的羟基与聚乙烯醇(PVA)链上的羟基存在较强的氢键作用。扫描电镜显示当TiO2的质量分数低于1.5%时,在PVA中分散均匀。X射线衍射显示纳米TiO2的加入降低了膜的结晶度。通过对含水质量分数低于20%的水/乙醇体系的脱水研究了该杂化膜的渗透性能,考察了TiO2粒子填充量、料液质量分数和温度与膜分离性能之间的关系。渗透通量J随着TiO2、水质量分数和温度的升高而增加,分离因子随着温度和水质量分数的升高而下降,在TiO2质量分数为1.5%时分离因子达到最佳值。40℃下分离质量分数85%的乙醇水溶液,分离因子可达1 590,渗透通量为0.049kg/(m2.h)。     

Dynamic cure kinetics of epoxy/TiO2/MWCNT hybrid nanocomposites

The effect of multi-walled carbon nanotubes (MWCNTs) on cure kinetic parameters of the epoxy/amine/TiO₂ (1 wt%) resin system was studied dynamically at four heating rates using DTA. The presence of MWCNT in various amounts (0.1, 0.2, 0.4 and 0.6 wt%) neither retarded nor accelerated the cure reaction of the epoxy/amine/TiO₂ system in a considerable extent. Addition of MWCNTs increased the extent of cure of the corresponding nanocomposites, especially at higher contents up to 0.4 wt% MWCNT filled composite. However, increasing the MWCNT content to 0.6 wt% adversely affected the extent of cure due to nanoparticle agglomeration. The fracture surface morphology of the nanocomposites revealed that the cracks deviated on reaching the MWCNTs, while propagating in the polymer matrix. Fractional extent of conversion (α) was calculated using genetic algorithm. Flynn–Wall–Ozawa and Kissinger methods were used to analyze the kinetic parameters. The presence of MWCNTs did not affect the autocatalytic cure mechanism of epoxy/amine/TiO₂ resin system and also did not cause any considerable barrier effect on the curing process. Activation energy data fitted well in the cubic polynomial regression equations and the changes of E _a with respect to α proved the autocatalytic cure mechanism, being followed by all the MWCNT-containing epoxy-based hybrid nanocomposites.     

MMA-MTMS共聚物/TiO_2杂化材料的制备与形态表征

以钛酸四异丙酯(TTIP)、甲基丙烯酸甲酯(MMA)、γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MTMS)为原料,用溶胶-凝胶法制备了一系列不同粒径的TiO2溶胶及不同TiO2含量的聚(甲基丙烯酸甲酯-共聚-γ-甲基丙烯酰氧基丙基三甲氧基硅烷)/TiO2杂化材料,通过动态激光光散射、红外吸收光谱、原子粒显微镜对TiO2溶胶及其杂化材料进行了表征。结果表明,当H2O与TIPP的摩尔比在1∶1~22∶1时,TiO2溶胶是稳定的,TiO2在杂化材料中的分布是均匀的、无团聚现象。