共查询到20条相似文献,搜索用时 93 毫秒
1.
有机硅树脂合成及其共混改性研究 总被引:4,自引:0,他引:4
通过实验筛选出合成有机硅树脂的配方,讨论了原料配比、水解温度,介质酸度和溶剂组成对有机硅树脂的影响。采用傅里叶变换红外光谱表征了聚甲基丙烯酸丁酯(PBMA)共混改性有机硅树脂前后的结构特征;采用扫描电子显微镜分析了有机硅树脂、PBMA和PBMA共混改性有机硅树脂的微观结构,进而探讨,改性有机硅树脂室温同化机理,即有机硅树脂分子和PBMA分子之间的互相介入、互相贯穿使之形成网络,具有了自由基协同效应。 相似文献
2.
3.
《有机硅材料》2003,17(1)
尼龙 6-聚硅氧烷共混物 CN 1 35 5 82 4A有机官能团改性的聚硅氧烷与支链醇的混合物在生产挠性聚氨酯泡沫塑料中的应用 CN 1 35 6349A酰胺型聚合物 硅氧烷聚合物共混物及其制造工艺 CN 1 35 70 2 1A含有高分子树脂的喷雾型汽车清洁光亮软蜡组合物 包含超大分子有机硅树脂和超小分子有机硅树脂。 CN 1 35 75 87A可固化的有机聚硅氧烷调制剂 CN 1 35 880 0A内含脱模组合物 采用了聚二甲基硅氧烷表面活性剂。 CN 1 35 940 5A有机硅改性丙烯酸固体树脂及其制备方法 CN 1 35 9960A有机硅改性丙烯酸乳液组合物… 相似文献
4.
综述了用于LED封装材料的有机硅改性环氧树脂类和有机硅树脂材料的研究进展,介绍了有机硅改性环氧树脂的物理共混和化学共聚方法,以及使用有机硅树脂为LED封装材料的特色优势,有机硅树脂产品的制造工艺特点和目前现状,并展望了有机硅封装材料的未来可能的研究方向。 相似文献
5.
6.
有机硅与聚氨酯预聚体或甲基丙烯酸丁酯化学共混物的相结构 总被引:7,自引:1,他引:7
有机硅(端羟基聚二甲基硅氧烷)改性有机树脂,其相界面为一过渡层,改善了两者之间的相容性。而有机硅分散相则根据有机树脂的不同,显示的相也大小不一。聚氨酯预聚体-有机硅共混物的微相分离程度优于甲基丙烯酸丁酯-有机 硅共混物。材料的加工过程影响高聚物的聚集态结构。 相似文献
7.
8.
采用水性有机硅树脂和无机硅酸钠溶液共混改性后而制备的黏结剂为基料,以缩合磷酸铝为反应固化剂,通过添加空心陶瓷微珠和金属铝粉等功能性填料,制得耐600℃高温、隔热保温效果显著的隔热涂料。 相似文献
9.
10.
11.
A series of cross-linked polyether-polyester polyurethane dispersions modified with organosiloxane were prepared based on hydroxyl-terminated polydimethylsiloxane (HTPS) as hydrophobic component and 3-aminopropyl-triethoxysilane (APTS) as cross-linker as well as a bridge between polyurethane (PU) and polysiloxane (PSIL). It was discovered that polydimethylsiloxane segments were incorporated into PU chains chemically and organosiloxane was preferentially oriented toward the surface layer of the film by making a comparison of attenuated total reflection (ATR) spectra between the copolymer and the blend of PU and PSIL, which was further confirmed by investigation of electron spectroscopy for chemical analysis (ESCA). The relationships between surface properties of the film formed from polyurethane dispersion and organosiloxane content were also studied. The results showed that water contact angle of the film increased with the increase of organosiloxane content. Interestingly, it was also found that water contact angle of PUS film increased firstly and then decreased when film-forming temperature varied from 25℃ to 55℃. 相似文献
12.
在有机硅氧烷的溶胶-凝胶过程中,常常形成超分子自组装结构,这种自组装行为对前体水解/缩合反应过程具有非常重要的影响。本文从有机硅氧烷分子自身结构影响和外源分子的诱导作用两个方面出发,综述了近年来有关溶胶-凝胶过程中有机硅氧烷自组装行为研究方面的特色工作。分析了该领域未来发展的主要方向,指出设计合成含有独特官能团的有机硅氧烷为前体,引入外源分子,基于外源分子与前体分子之间的相互作用构筑有机硅氧烷超分子体系,利用水解/缩合过程与自组装体系之间的协同作用制备具有长程有序的硅基复合材料,将是该领域未来研究的重点。 相似文献
13.
Hou-Sheng?Xia Chun-Hui ?Zhou Dong?Shen?Tong Chun?Xiang?Lin 《Journal of Porous Materials》2010,17(2):225-252
This paper provides a comprehensive and critical overview of recent advances in synthesis chemistry and application development
of periodic mesoporous organosilicas (PMOs). A number of organic bridge-bonded functional and multifunctional PMOs with inorganic–organic
hybridized framework have been synthesized from varieties of precursors. The syntheses of a series of PMOs have been accomplished
typically by resorting to the co-condensation of the mixed precursors of tetraalkoxysilane and bridged organosiloxane, bridged
organosiloxane with terminal organosiloxane, or the co-condensation of multiple bridged organosiloxane. The choice of precursors
depends on the desired location of organic groups which can be either on the surface or within the pore wall in resulting
PMOs. Besides precursors, synthesis conditions evidently play an important role in the formation, morphologies and pore structure
of PMOs. Recent advances show that the morphologies and mesopores of PMOs can be adjusted by changing the synthetic parameters
such as template, additives, pH value, and temperature. The PMOs with tunable composition, morphology and even-distributed
hydrophobic organic groups in the framework endow such periodic mesoporous hybrids with great potentials in the fields of
catalysis, environmental remediation, biology, pharmacy, analytical chemistry and microelectronics. The synthesis chemistry
of PMOs and application development would particularly and continuously appeal to the researchers in chemistry and materials
science in future. 相似文献
14.
15.
16.
Intramolecularly crosslinked poly(organosiloxane) particles are prepared by means of emulsion polycondensation or emulsion polymerization of alkoxysilanes or cyclic organic siloxanes. Starting from these intramolecularly crosslinked poly(organosiloxane) particles, graft copolymers are obtained by free-radical emulsion polymerization of unsaturated olefinic monomers (e.g. acrylates, styrene) in the presence of (functionalized) organosiloxanes. Intramolecularly crosslinked poly(siloxane) particles and their graft copolymers are characterized by means of light scattering (in dispersion), electron microscopy and thermal analyses (DSC, DMTA). 相似文献
17.
18.
有机硅氧烷改性丙烯酸酯微乳液的合成与表征 总被引:18,自引:2,他引:18
采用种子乳液聚合法,以阴离子乳化剂DF-2和非离子乳化剂OP-10作为复合乳化剂,以FeSO4、K2S2O8和甲醛合次亚硫酸氢钠(SFS)作为氧化-还原引发剂,在65℃合成了有机硅改性丙烯酸酯聚合物微乳液。实验采用单体滴加工艺,用COULTERLS粒度仪和傅里叶变换红外光谱仪分别测定了共聚乳液的粒径分布和产物的结构,研究了加料方式、配方组成及操作方式对聚合稳定性、乳液的粒径分布以及产物性能的影响。结果表明,采用单体滴加工艺能得到平均粒径为50~80nm的单峰窄分布微乳液,并有效地将有机硅氧烷引入到共聚物大分子中。 相似文献
19.
20.