多面体低聚倍半硅氧烷及其在聚合物中的应用进展

介绍了多面体低聚倍半硅氧烷的结构和性能,重点介绍了多面体低聚倍半硅氧烷的几种合成方法;在聚合物体系中的应用及对聚合物性能的提高,并对今后多面体低聚倍半硅氧烷的发展做了相关的阐述.     

笼型多面体低聚倍半硅氧烷研究进展

笼形多面体低聚倍半硅氧烷是近年来新兴的一类真正分子水平上的有机/无机杂化纳米材料.介绍了POSS的有机无机杂化的笼形结构和相应性能,总结了通过三官能的有机硅单体水解缩聚合成POSS及其衍生物的路线及存在的低产率、高成本问题,并概述了POSS基聚合物的性能、杂化结构和制备方法,指出了POSS在各领域的应用前景,并对POSS基材料的发展趋势和有待于进一步解决的问题进行了探讨.     

POSS改性有机玻璃研究进展

目的 多面体低聚倍半硅氧烷(POSS)/聚合物复合材料是近年来材料科学领域研究的热点.把具有特殊笼型结构的新型有机-无机纳米粒子POSS用于改性有机玻璃(PMMA),可以提高PMMA的热学、力学和阻燃等性能,从而提升PMMA的使用效能,拓宽其应用领域.方法 通过对文献进行分析,阐明POSS的合成方法、特性和应用,并全面综述POSS改性PMMA的应用研究进展.结论 分析了目前POSS改性PMMA相关研究的不足,并提出了POSS改性PMMA拓展代替钢化玻璃应用于高层建筑和传统透明材料应用包装领域拟解决的关键问题.     

杂化笼形聚倍半硅氧烷的结构性能与应用

笼形倍半硅氧烷是一类新型高性能的多面体有机／无机分子复合物。本文从笼型倍半硅氧烷的结构特点,合成方法及主要性能方面出发,对笼型倍半硅氧烷的有机／无机杂化改性进行了综合性描述,介绍了它们的发展趋势。     

多面体低聚倍半硅氧烷纳米杂化材料制备方法研究进展

多面体低聚倍半硅氧烷(POSS)作为一种新型的有机-无机纳米杂化材料,在现代材料科学中显示出潜在的使用价值。不同取代基的POSS具有不同的反应活性,因此制备POSS基纳米复合材料的方法层出不穷。综述了以物理共混法和化学合成法制备POSS基纳米复合材料的研究进展,并展望了今后POSS基纳米杂化材料的发展前景。     

POSS/聚合物杂化材料应用的研究进展

笼型倍半硅氧烷(POSS)/聚合物有机无机杂化材料是近年来材料科学领域的一个研究热点。POSS/聚合物杂化材料在很多领域都呈现出了巨大的应用前景,如高温绝缘材料、低介电常数材料、传感器、光学元件材料、催化剂载体等。文中综述了其在航空航天、耐热阻燃、高性能介电材料、多孔功能材料、催化剂、陶瓷前驱体、纳米复合材料和生物齿科材料等方面应用的研究进展。最后,笔者指出目前制约POSS/聚合物杂化材料深入研究和广泛应用的关键原因是POSS化合物的合成。     

POSS/聚合物杂化材料研究进展

多面体低聚倍半硅氧烷(POSS)作为一种特殊的纳米级有机-无机杂化材料,可以与聚合物进行分子级复合,得到具有特殊性能的POSS/聚合物杂化材料,这成为近年来材料科学领域的研究热点之一。从POSS/聚合物杂化材料制备方法出发,主要介绍了几类典型的POSS/聚合物杂化材料的结构和性能,并对POSS/聚合物杂化材料的应用前景进行了展望。     

聚苯基倍半硅氧烷研究进展

分别介绍了梯型、笼形聚苯基倍半硅氧烷及其共聚物的结构、性质和合成方法,重点综述了苯基倍半硅氧烷共聚物研究进展,并对苯基倍半硅氧烷材料的发展趋势进行了展望。     

桥联聚倍半硅氧烷(BPS)的研究进展

介绍了一种新型的杂化材料---桥联聚倍半硅氧烷(Bridged polysilsesquioxanes,BPS),该材料由于结构上的特殊性而表现出许多优异的性能。阐述了桥联聚倍半硅氧烷的研究现状及结构特性,重点综述了该材料的制备方法及其在光电、催化、吸附等材料领域内的应用,在此基础上展望了今后的发展趋势。     

POSS基有机-无机杂化高分子的制备及低介电性能

利用硅氢加成反应技术，以多面低聚倍半硅氧烷T8H8和二（对烯丙氧基苯甲酸）丁二醇酯为单体合成了有机．无机杂化交联聚合物。用FTIR和^29Si NMR等对材料进行了结构表征，结果表明，在聚合物中两种单体以化学键相连，无机与有机相均匀分散，T8H8分子中平均有6.3个Si-H键与C=C双键发生了加成反应，得到了三维网络聚合物。TGA分析结果表明，聚合物具有较高的热稳定性，热分解温度为376℃。Ellipsometer测试结果表明，聚合物薄膜具有较低的介电常数，k值为2．4。薄膜表面经三甲基氯硅烷疏水处理后，k值减小为2．2。     

新一代高性能POSS-聚合物材料

描述了多面体聚硅倍半氧烷（Polyhedral Oligomeric Silsesquioxane,POSS)单体的结构与性能,POSS单体改性聚合物在塑料工业,航空与空间等领域的应用现状与前景,并对POSS单体合成技术,成本,POSS单体一步形成串凳式,悬笼式和笼－笼连接式结构作了综合评述。     

Effect of POSS content on the electrical,thermal, mechanical,and wetting properties of electrospun polyacrylonitrile (PAN)/POSS nanofibrous mats

Although polyacrylonitrile (PAN) has excellent properties as a precursor of carbon fibre, octa-amic polyhedral oligomeric silsesquioxane (POSS) nanoparticles which are hybrid organic–inorganic materials can be incorporated into PAN to tune up the properties such as the mechanical strength, thermal conductivity, and electronic conductivity for a broad range of potential applications. In this work, PAN with POSS of 1, 3, and 5 wt % based on acrylonitrile weight was prepared by solution polymerisation. The synthesised product was dissolved in dimethyl sulphoxide, followed by electrospinning. After electrospinning, the nanofibrous mats were stabilised at 250 °C for 1 h. The diameter of resulting PAN/POSS nanofibrous mats were less than 1 μm, as confirmed by SEM analysis. The effect of POSS on PAN/POSS nanofibrous mats was studied by SEM, universal testing machine, contact angle measurement, Fourier transform infrared spectroscopy, wide angle X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis. The usefulness of the PAN/POSS nanofibre composites was realised from the improved electrical, thermal, mechanical, and wetting properties compared to pure PAN.     

笼型倍半硅氧烷(POSS)合成的研究进展

笼型倍半硅氧烷(POSS)是一类引人注目的新型纳米材料。POSS独特的有机无机杂化结构赋予其许多优异的性能,如高的耐热性、力学性能、良好的介电性能及光学性能等,展示出广泛的应用前景。文中首先介绍了POSS的结构和性能特点,然后详细综述了笼型倍半硅氧烷(POSS)合成方面的研究进展,将笼型倍半硅氧烷的合成方法分成三官能团硅烷的水解缩聚反应法、顶端-带帽法、硅氢化反应法、侧基转化法和POSS的结构重排法等5种合成方法。     

笼型倍半硅氧烷(POSS)/环氧树脂有机无机杂化材料的热性能

为了提高环氧树脂(EP)的性能,采用具有氨基官能团的笼型倍半硅氧烷(POSS)改性.首先通过POSS与EP发生化学反应,形成有机无机杂化树脂;然后固化杂化树脂,得到POSS/EP有机无机杂化材料.文中研究了杂化树脂的凝胶特性和杂化材料的热性能,包括热变性温度(HDT)、玻璃化转变温度(Tg)和高温热分解性能.研究结果表...     

含有POSS的嵌段聚合物的制备及热性能

以单官能团笼状结构倍半硅氧烷(POSS)为引发剂,氯化亚铜/2,2-联吡啶为催化体系,甲苯为溶剂,采用原子转移自由基聚合法(ATRP)制备了大分子引发剂POSS/PMMA和POSS/PMMA-PS嵌段聚合物。通过核磁共振(1H-NMR)、X射线光电子能谱(XPS)和凝胶渗透色谱(GPC)表征了大分子引发剂和嵌段聚合物的结构,实现了POSS在聚合物中的单分散。此外,热重分析(TGA)结果表明,POSS/PMMA和POSS/PMMA-PS嵌段聚合物的分解温度与纯聚甲基丙烯酸甲酯(PMMA)相比分别提高了60℃和151℃。     

多面齐聚倍半硅氧烷的合成及其改性复合材料的应用

由于独特的纳米尺寸、空间立体结构和易于化学改性的特性,多面齐聚倍半硅氧烷(POSS)得到了极大关注。同时,具有有机和无机材料的特性使POSS复合材料得到了快速的发展,特别是在生物医学、催化剂、光学材料和介电材料等领域。主要总结了POSS单体的合成手段和在改性复合物材料中的应用,并指出POSS及其改性复合材料的发展趋势。     

利用笼形聚倍半硅氧烷增强多壁碳纳米管在水溶液中的分散性

以笼形聚倍半硅氧烷(POSS)为物理分散剂,利用POSS与多壁碳纳米管(MWNTs)间较强的相互作用,在水溶液中对MWNTs进行分散。借助紫外吸光度对POSS分散的MWNTs浓度和稳定性进行了表征,测定了分散液的Zeta电位和离心后上清液中固体物质的质量分数,并用透射电镜观察了POSS与MWNTs间的结合情况。结果表明,POSS可以显著提高MWNTs在水溶液中的分散性,且提高程度与其有机官能团R的结构有关。在所采用的五种POSS中,八异丁基笼形聚倍半硅氧烷(POSSC)的分散效果最好。在此基础上,优化得到POSSC分散MWNTs的最佳条件,即MWNTs浓度为30mg/L,POSSC和MWNTs的质量比为1。此时,POSSC可较好地吸附在MWNTs表面对其进行分散,得到具有良好稳定性的MWNTs水分散液。该分散方法简单高效且不破坏MWNTs的完整结构,所得分散液可用于复合材料的制备。     

Polyhedral Oligomeric Silsesquioxane-Based Nanoparticles for Efficient Chemotherapy of Glioblastoma

Glioblastoma (GBM) is the most common lethal brain tumor with dismal treatment outcomes and poor response to chemotherapy. As the regulatory center of cytogenetics and metabolism, most tumor chemotherapeutic molecules exert therapeutic effects in the nucleus. Nanodrugs showing the nuclear aggregation effect are expected to eliminate and fundamentally suppress tumor cells. In this study, a nanodrug delivery system based on polyhedral oligomeric silsesquioxane (POSS) is introduced to deliver drugs into the nuclei of GBM cells, effectively enhancing the therapeutic efficacy of chemotherapy. The nanoparticles are modified with folic acid and iRGD peptides molecules to improve their tumor cell targeting and uptake via receptor-mediated endocytosis. Nuclear aggregation allows for the direct delivery of chemotherapeutic drug temozolomide (TMZ) to the tumor cell nuclei, resulting in more significant DNA damage and inhibition of tumor cell proliferation. Herein, TMZ-loaded POSS nanoparticles can significantly improve the survival of GBM-bearing mice. Therefore, the modified POSS nanoparticles may serve as a promising drug-loaded delivery platform to improve chemotherapy outcomes in GBM patients.     

Polyhedral oligomeric silsesquioxane-coated nanodiamonds for multifunctional applications

Polyhedral oligomeric silsesquioxane (POSS)-coated nanodiamonds (NDs@POSS) were prepared via the amide formation between amine-functionalized POSS and oxygen-containing groups of NDs. The POSS structures grafted on the surface of NDs enable the NDs@POSS nanocomposites to be well-dispersed in organic solvents and polymers for multifunctional applications. The surface coating of NDs with POSS also bring other incidental advantages such as enhanced thermal stability and superhydrophobic of the NDs. NDs@POSS nanocomposites-embedded hybrid films based on polycarbonate and polyvinyl butyral were fabricated by solution blending methods, showing tunable refractive indexes in the range of 1.49–1.61. Furthermore, the powders of NDs@POSS were superhydrophobic with contact angle of water/air of 154°. Liquid marbles formed by coating the water droplet with NDs@POSS were prepared, and the process intensification effects of the NDs@POSS-based miniature reactors for degradation of methylene and fabrication of Ag nanoparticles were also demonstrated, respectively.