共查询到18条相似文献,搜索用时 93 毫秒
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PMMA/SiO2透明块体材料的热性能分析与微观结构表征 总被引:1,自引:0,他引:1
以正硅酸乙酯为前驱体,采用无溶剂水解技术,制备出了均一、稳定、透明的二氧化硅溶胶,通过透射电镜分析,粒径在100nm左右;在溶胶中加入甲基丙烯酸甲酯(MMA)和偶氮二异丁腈(AIBN),采用热固化的方式制备出透明的块体PMMA/SiO2杂化材料,通过差热分析、热重和透射电镜表征杂化材料的热性能和微观结构,实验结果表明:当体系中的SiO2含量超过20%时,杂化材料无明显的玻璃化转变温度;无机相均匀分散在有机相中,两相之间没有明显的相分离现象,制备出均一的杂化材料。 相似文献
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溶胶-凝胶法制备丙烯酸树脂/TiO2有机-无机杂化材料及其结构表征 总被引:10,自引:0,他引:10
通过预水解的二氧化钛(TiO2 )溶胶与丙烯酸树脂共混或原位聚合的方法制备了均匀透明的丙烯酸树脂 TiO2 有机 无机杂化材料.考察了TiO2 溶胶制备方法、聚合物中—COOH官能团含量和杂化材料制备方法对杂化材料结构的影响.索氏抽提实验表明聚合物中的羧酸官能团和无机TiO2 相间发生了交联反应,且随着—COOH官能团含量的增加,交联程度增大.小角X射线散射(SAXS)结果发现,杂化材料中TiO2 为疏松的三维网状结构,且在纳米尺度范围内,但这种三维网状结构随着TiO2 溶胶制备中水或酸的用量增加,其致密度增加,尺寸增大.同原位聚合法相比,共混法可制备出更均匀的杂化体系,且TiO2 为单分散. 相似文献
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溶胶-凝胶法制备丙烯酸甲酯-衣康酸酐共聚物/SiO_2杂化材料 总被引:2,自引:0,他引:2
以丙烯酸甲酯( MA) 和衣康酸酐(Itn) 的无规共聚物和原硅酸四乙酯(TEOS) 作为有机相与无机相前驱体,以3 氨丙基三乙氧基硅烷(APTES) 为偶联剂,通过溶胶 凝胶过程制备出有机 无机杂化材料.并通过SEM、DSC 等方法考查了偶联剂用量对所得材料结构及性能的影响. 相似文献
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溶胶-凝胶法合成聚甲基丙烯酸甲酯/二氧化钛-二氧化硅杂化聚合物材料 总被引:13,自引:3,他引:13
通过溶胶 凝胶过程合成了有机聚合物链段与无机相间有共价键存在的P(MMA MSMA)/TiO2 SiO2杂化聚合物材料.溶剂抽提结果表明杂化材料体系中凝胶的含量很高.通过FTIR测试对材料进行了结构分析,并且由TGA、DSC测试分别分析了杂化材料体系中无机组份总量以及Ti(OC4H9)4的含量对材料性能的影响. 相似文献
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PDMS/SiO2 杂化材料的制备与性能研究 总被引:1,自引:0,他引:1
以羟基封端的聚二甲基硅氧烷(PDMS)和正硅酸乙酯为主要原料,通过溶胶-凝胶法成功制备出均匀透明的PDMS/SiO2杂化材料,采用红外吸收光谱、紫外-可见光透过光谱、扫描电子显微镜以及热分析仪对制备的材料进行了表征。结果表明,所制得的杂化材料以化学键相结合,两相分散均匀,可见光区透光率高达90%以上,耐热性能良好。 相似文献
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采用溶胶-凝胶法制备了SiO2/TiO2杂化材料,并通过双官能团试剂3-(甲氧基硅烷基)甲基丙烯酸丙酯(γ-MAPS)对其进行改性;改性溶胶与甲基丙基酸丁酯(BMA)作为功能单体,在毛细管中进行原位聚合反应,制备了新型的有机-无机杂化毛细管整体柱。采用扫描电子显微镜观察了整体柱柱床的形貌。以硫脲为电渗流标记物对所制备的整体柱进行了柱性能评价,考察了柱的稳定性和重现性,获得了88000plates/m的柱效;考察了中性物质在柱上的的保留行为,得出该柱具有反相电色谱保留性能。通过对2种短肽(磷酸肽和非磷酸肽)洗脱测试,实现了对磷酸肽的有效富集与分离。 相似文献
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二氧化硅-聚苯胺(SiO2-PANI)杂化透明导电薄膜的制备和表征 总被引:1,自引:0,他引:1
本文采用溶胶-凝胶法,以3-巯丙基三甲氧基硅烷(MPTMS)和聚苯胺为主要原料,制备得到有机-无机杂化透明导电薄膜。着重研究制备过程中醋酸、间甲酚和聚苯胺含量对薄膜结构、导电性和可见光透过率的影响。通过红外光谱可知,采用溶胶-凝胶法可制得结构稳定的杂化导电材料。醋酸作为水解缩聚反应的反应剂和催化剂,当其与3-巯丙基三甲氧基硅烷的物质的量比为0.4时,MPTMS的水解缩聚速率和聚苯胺掺杂入无机前驱体的掺杂速率达到平衡。此外,透明杂化导电薄膜的方块电阻随间甲酚和聚苯胺含量的增加而降低,当间甲酚和3-巯丙基三甲氧基硅烷的物质的量比为5,聚苯胺和二氧化硅的质量比为3/7时,薄膜的方块电阻为3.23 kΩ/□,可见光透过率为80%。 相似文献
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Organic-inorganic Hybrid Materials Based on Molybdophosphate and Organic Polyammonium 总被引:3,自引:0,他引:3
A new organic-inorganic hybrid compound (dienHs)2(P2Mo5O23) (1) [dien=NH(CH2CH2NH2)2] has been hydrothermally synthesized and characterized by elemental analyses, IR spectrum, thermogravimetric analysis, and the single crystal X-ray diffraction technique. Compound 1 crystallizes in the triclinic system with space group P1 and a=0.9790(2) nm, b=0.9922(2) nm, c= 1.4644(3) nm, α=95.510(10)°, β=98.860(10)°, γ=95.700(10)°, V=1.3895(5) nm^3, Z=2, R=0.0465. The results show that the compound consists of dienH3^3++ and P2Mo5O23^6-, and the heteropoly anion P2Mo5O23^6- is connected to a 1-D chain structure with the protonated dien by hydrogen bonds. 相似文献
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Mitsunobu Iwasaki Ken-Ichiro Kashimura Hitoshi Masaki Seishiro Ito 《Journal of Sol-Gel Science and Technology》2003,26(1-3):389-392
Inorganic-organic hybrid materials in La2O3-TiO2-SiO2 system were prepared from La(NO3)3, titanium tetraisopropoxide, and silicon alkoxides. Ternary transparent materials prepared from glycidyloxypropyltrimethoxysilane (GPTS) were obtained in a wide composition region (La2O3 50 mol%, TiO2 40 mol%). Hybrid materials prepared using methyltrimethoxysilane (MTMS) at MTMS/TMOS = 1 were transparent in the composition of La2O3 30 mol% and TiO2 25 mol%. La(NO3)3 crystallines or TiO2 small particles were precipitated in translucent materials. La2O3 content strongly affected the bulk density compared with TiO2 content. Absorption edge of the hybrid materials was shifted to longer wavelength as TiO2 and La2O3 contents increased. Partial coefficient of refractive index for the three metal oxides increased in the order SiO2 < TiO2 < La2O3 for both hybrid materials. 相似文献
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In this article, the poly(methyl methacrylate)/montmorillonite (PMMA/MMT) organic-inorganic hybrid materials were prepared by conventional free radical polymerization and reversible addition-fragmentation chain transfer (RAFT) polymerization, respectively. The kinetics comparison of these two polymerizations was studied. The PMMA/MMT hybrid materials were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). According to these results, we knew that the polymerization behavior of MMA showed controlled/living radical polymerization (CLRP) characteristics under the control of RAFT agent. The incorporation of RAFT agent and MMT nanoparticles improved the thermal properties of polymers, and the thermal stability of polymers increased with increasing content of MMT nanoparticles. The structures and morphologies of PMMA/MMT hybrid materials were characterized by FT-IR, XRD and TEM. These results showed that the MMA monomer can be initiated and propagated in the clay layers of MMT via the control of RAFT agent, and then the exfoliated structure was obtained for the hybrid materials. 相似文献