共查询到18条相似文献,搜索用时 62 毫秒
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笼型聚倍半硅氧烷基聚合物是一种典型的多面体有机/无机分子复合物材料,因其具有优异的光、电、热、磁、声、力学和化学相容性等性能,所以近年来被极力的引入较为尖端的技术领域进行研究和应用。本文详尽归纳总结了笼型倍半硅氧烷基聚合物的现行制备方法,讨论了笼型倍半硅氧烷结构对材料性能的影响。最后,对笼型倍半硅氧烷基聚合物材料的应用领域和发展趋势进行了详细说明。 相似文献
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《合成纤维工业》2017,(5):51-56
介绍了多面体低聚倍半硅氧烷(POSS)的分类、结构和性能,POSS是基于化学键合作用而形成的一种分子水平上的纳米有机/无机杂化体,具有规整的立体结构、纳米尺度、优良的相容性和修饰性,其独特的纳米笼形结构使之成为分子结构设计和材料改性的最佳选择。综述了POSS的合成方法及研究进展,如三官能度硅烷或四官能度硅烷在酸、碱或有机盐催化下通过水解缩合反应合成POSS;以POSS为母体,通过封角闭环法和官能团转化衍生法合成POSS;点击化学法制备POSS等。比较了各种方法的优点和存在的问题,指出目前国内POSS的研究重点是合成带有高活性的POSS单体,改进合成路线及工艺,为其工艺化提供技术支持。 相似文献
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笼型聚倍半硅氧烷基聚合物是一种典型的多面体有机/无机分子复合物材料,因其具有优异的光、电、热、磁、声、力学和化学相容性等性能,所以近年来被极力的引入较为尖端的技术领域进行研究和应用。本文详尽归纳总结了笼型倍半硅氧烷基聚合物的现行制备方法,讨论了笼型倍半硅氧烷结构对材料性能的影响。最后,对笼型倍半硅氧烷基聚合物材料的应用领域和发展趋势进行了详细说明。 相似文献
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杨国栋 《合成材料老化与应用》2010,39(2):41-48
笼型倍半硅氧烷基聚合物是一种典型的多面体有机/无机分子复合物材料,因其具有优异的光、电、热、磁、声、力学和化学相容性等性能,所以近年来被引入较为尖端的技术领域进行研究和应用。本文归纳总结了笼型倍半硅氧烷基聚合物的现行制备方法,讨论了笼型倍半硅氧烷结构对材料性能的影响。最后,对笼型倍半硅氧烷基聚合物材料的应用领域和发展趋势进行了说明。 相似文献
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有机-无机杂化纳米结构体——多面体低聚硅倍半氧烷研究进展 总被引:2,自引:0,他引:2
多面体低聚硅倍半氧烷是基于化学键合作用形成的分子内杂化体系,其改性后的材料是一类具有广泛潜在应用价值的新型有机-无机杂化材料。介绍了多面体低聚硅倍半氧烷单体的结构、性能、单体及其衍生物的合成,以及其改性聚合物材料在航空、航天、生物、电子等高科技领域内的应用前景。针对国内的研究现状,指出低聚硅倍半氧烷-聚合物杂化体系研究所存在的问题。 相似文献
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用环戊基三氯硅烷合成不完全缩合三羟基硅氧烷[(C5H9)7Si7O9(OH)3],再以乙烯基三氯硅烷和不完全缩合三羟基硅氧烷为原料,以四氢呋喃和三乙胺为混合溶剂,通过“顶角-戴帽”反应合成了笼型单乙烯基倍半硅氧烷,即1,3,5,7,9,11,13-七环戊基-15-乙烯基笼型倍半硅氧烷(VinylPOSS)。利用FTIR、1H NMR、29Si NMR、13C NMR、元素分析、WAXD和TGA表征了VinylPOSS的结构及热稳定性。研究结果表明VinylPOSS的产率随着反应时间的增加而提高,当反应时间为10 h时,产率高达90%;其在弱极性溶剂中具有较好的溶解性,5%失重温度为283℃,800℃残留率为56%,具有较高的热稳定性。研究了VinylPOSS和高含氢硅油(HHSF)的反应性,结果表明VinylPOSS能与含氢硅油发生α、β加成反应, 且以β加成为主。 相似文献
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甲基笼型倍半硅氧烷/CE杂化复合材料的力学性能 总被引:1,自引:0,他引:1
以甲基笼型倍半硅氧烷(POSS)作为氰酸酯树脂(CE)的改性剂,制备出一种POSS/CE杂化复合材料。研究了杂化复合材料中POSS用量对CE结构及力学性能的影响,同时采用红外光谱(FT-IR)法对不同POSS/CE体系的反应性进行了研究。结果表明:POSS的加入对CE的反应性影响不大,有利于POSS/CE杂化体系固化工艺的制定;当杂化体系中w(POSS)=5%时,材料的冲击强度(9.7 kJ/m2)相对最大(提高了49%),弯曲强度(90 MPa)也相对较高,说明适量的POSS对CE具有明显的增韧、增强作用。 相似文献
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A series of composite electrolytes (CEs) consisting of organic/inorganic hybrid star-shaped polymer (SPP13), plasticizer (PEG-functionalized POSS derivatives), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) were prepared to investigate the effects of the composite compositions and PEG chain length of PEs on the properties of CEs. SPP13 was prepared via ATRP from poly(ethylene glycol) methyl ether methacrylate (PEGMA) and methacryl-cyclohexyl-POSS (MA-POSS) using an octafunctional initiator, and the PEG-functionalized POSS derivatives were synthesized by the hydrosilylation reaction of octakis(dimethylsilyloxy)silsesquioxane (OHPS) and allyl-PEG. The CEs were found to be dimensionally-stable enough to separate the electrodes in batteries, but they still possessed high mobility of ion-conducting P(PEGMA) segments, as estimated by the low glass transition temperatures (Tg). The CEs having solid-state show quite high ionic conductivity (4.5 × 10−5 S cm−1 at 30 °C) which is about three times of magnitude larger than that of the matrix polymer (SPP13) electrolyte (1.5 × 10−5 S cm−1 at 30 °C). The CEs were electrochemically stable up to +4.2 V without the decomposition of electrolytes. An all-solid-state lithium battery prepared from the CEs exhibited larger discharge capacity than that prepared from the SPP13 electrolyte at 60 °C. 相似文献
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A series of cyanate ester resin (CE) based organic–inorganic hybrids containing different contents (0, 5, 10, 15 and 20 wt%) of epoxy‐functionalized polyhedral oligomeric silsesquioxane (POSS‐Ep) were prepared by casting and curing. The hybrid resin systems were studied by the gel time test to evaluate the effect of POSS‐Ep on the curing reactivity of CE. The impact and flexural strengths of the hybrids were investigated. The micromorphological, dynamic mechanical and thermal properties of the hybrids were studied by SEM, dynamic mechanical analysis (DMA) and TGA, respectively. Results showed that POSS‐Ep prolonged the gel time of CE. CE10 containing 10 wt% POSS‐Ep displayed not only the optimum impact strength but the optimum flexural strength. SEM results revealed that the improvement of mechanical properties was attributed to the large amount of tough whirls and fiber‐like pull‐outs observed on the fracture surfaces of CE10. DMA results indicated that POSS‐CE tended to decrease E′ of the hybrids in the glassy state but to increase E′ of the hybrids in the rubbery state. TGA results showed that CE10 also possesses the best thermal stability. The initial temperature of decomposition (Ti) of CE10 is 426 °C, 44 °C higher than that of pristine CE. © 2013 Society of Chemical Industry 相似文献
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Charles U. Pittman Jr. Gui Zhi Li Ho Souk Cho 《Journal of Inorganic and Organometallic Polymers and Materials》2006,16(1):43-59
Three classes of inorganic–organic hybrid phenolic resin/polyhedral oligomeric silsesquioxane (POSS) nanocomposites were synthesized.
Multifunctional dichloromethylsilylethylheptaisobutyl-POSS (POSS-1), trisilanolheptaphenyl-POSS (POSS-2), and poly(phenylsilsesquioxane) uncured POSS (POSS-3) were employed. Nonfunctional POSS-4 (octaisobuty1-POSS) was blended into the uncured phenolic resin and cured under the same conditions used for the other three
nanocomposite classes. Weight ratios of 99/1, 97/3, 95/5 and 90/10 were prepared for the POSS-1, 2 and 4 series and 99/1, 97/3 and 95/5 ratios for the POSS-3 nanocomposites. POSS-1 incorporation into this phenolic resin network increases T
g and broadens the tan
peak (DMTA) range. T
g and E′ values at T>T
g both increase with higher POSS-1 content. In contrast, incorporating 5 wt% of POSS-2 into the phenolic resin network lowers T
g to 193 from 213°C for the neat phenolic resin. All values of E′ for POSS-2 composites were higher, than those of the phenolic control in both glassy and rubbery regions. The T
g values of the 1 and 10% POSS-2 systems were higher. Incorporating 10 wt% of POSS-1 or POSS-2 improved the heat distorsion temperature and moduli (E′=123 and 201 GPa at 265°C, respectively, versus 56 GPa for the pure phenolic resin). Increases in E′ for T>T
g and T<T
g were also observed for all POSS-3 nanocomposites. However, the E′ at T>T
g and the T
g values of the POSS-4 composites were lower than those of the control resin. Octaisobutyl POSS-4 cannot form chemical bonds to the resin and could be extracted from its composites with THF. POSS derivatives were not present
in residues extracted by THF from the phenolic resins containing POSS-1, 2 or 3, because each of these derivatives were chemically bound within the phenolic resin. Subsequent heating cycles produce much
larger increases in T
g and E′ values in the rubbery region for the POSS-1, 2 and 3 composites than for the neat phenolic resin or for the POSS-4 systems.
An erratum to this article can be found at 相似文献
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Rodrigo Silva Cléia Salles Raquel Mauler Ricardo Oliveira 《Polymer International》2010,59(9):1221-1225
Research into organic–inorganic nanocomposites has recently become popular, particularly the development of new polymer nanocomposites. Compared to pristine polymers or conventional composites, these nanocomposites exhibit improved properties. The storage modulus of a poly(vinyl chloride) (PVC)/polyhedral oligomeric silsesquioxane (POSS) nanocomposite slightly decreased with POSS content, but had a higher modulus from 50 to 100 °C. Some of the material appeared to be aggregated with 1 wt% POSS in the polymeric matrix. Conversely, with a POSS content of 5 wt%, a better dispersion of the nanoparticles was observed. The presence of POSS in the plasticised PVC compound had little influence on the final properties of the nanocomposites, showing weaker interactions between the POSS and the plasticised PVC compound. Copyright © 2010 Society of Chemical Industry 相似文献
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Balasubramani Govindaraj Pudupadi Sundararajan Muthusamy Sarojadevi 《Polymer International》2012,61(8):1344-1352
A series of functional polyhedral oligomeric silsesquioxane (POSS)/polyimide (PI) nanocomposites were prepared using a two‐step approach. First, octa(aminophenyl)silsesquioxane (OAPS) was mixed with poly(amic acid) (PAA) prepared by reacting bis(4‐amino‐3,5‐dimethylphenyl)‐3‐quinolylmethane and 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride. Second, the resulting solution was subjected to thermal imidization. The well‐defined ‘hard particles’ (POSS) and the strong covalent bonds in the amide linkage between the carbon atom of the carboxyl side group in PAA and the nitrogen atom of the amino group in POSS lead to a significant improvement in the thermal and mechanical properties. Homogeneous dispersion of POSS cages in the PI is evident from scanning electron microscopy, which further confirms that the POSS molecule becomes an integral part of the organic‐inorganic inter‐crosslinked network system. Differential scanning calorimetry and dynamic mechanical analysis show that the glass transition temperatures of the POSS‐containing nanocomposites are higher than that of the corresponding neat PI system, owing to the significant increase of the crosslinking density in the PI/POSS nanocomposites. Increasing the concentration of OAPS in the PI networks decreases the dielectric constant. Pure PI and PI/POSS systems have good antimicrobial activity. Copyright © 2011 Society of Chemical Industry 相似文献