POSS在涂料领域的应用研究进展

本文简要介绍了POSS及POSS在聚合物中的应用特点,并回顾了近年来国内外有关POSS改性丙烯酸树脂,聚氨酯树脂,环氧树脂以及POSS在涂料领域的应用研究现状,并对未来POSS在涂料领域的应用和研究进行了展望。     

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。     

聚甲基丙烯酸甲酯改性研究进展

综述了聚甲基丙烯酸甲酯(PMMA)在耐热性能、耐磨损性能、阻燃等方面改性研究的途径及国内外研究的最新进展,分析了各种改性方法的特点,并展望了PMMA改性研究今后的发展方向.     

多面体低聚倍半硅氧烷(POSS)杂化材料

POSS作为一种特殊的有机-无机杂化材料,在结构上具有很强的可设计性,为新材料的研究提供了极大的便利,在近几年的研究中备受人们关注.介绍了POSS合成的研究进展,重点综述了近几年POSS杂化材料在光电材料、聚合物阻燃和材料表面改性等领域的应用.指出基于POSS的杂化材料发展前景广阔,在未来材料科学发展中将发挥重要作用.     

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℃。     

聚硅倍半氧烷改性聚合物表面自清洁性能研究进展

从表面自清洁的理论基础入手,分析POSS改性聚合物的特点,综述了POSS改性聚合物表面自清洁功能的最新进展.展望POSS改性聚合物在表面自清洁材料中的应用前景.     

ATRP法制备POSS/PMMA复合材料及表征

以单功能基POSSCl做引发剂,氯化亚铜/2,2-联吡啶做催化剂,在110℃引发单体甲基丙烯酸甲酯聚合,合成了单分散的POSS/PMMA有机-无机杂化材料。利用1H-NMR、FT-IR、XPS技术表征POSS/PMMA复合材料,并采用DSC和TG研究了复合材料的热性能。结果发现,含Si-Cl键的物质也可以作为ATRP方法的引发剂,通过ATRP法成功实现了POSS在材料中的单分散。     

笼型倍半硅氧烷(POSS)的合成及应用进展

综述了POSS的合成和研究进展,介绍了POSS改性聚合物材料的基本特点、机理和最新应用进展,并对POSS在低介电常数材料中的应用进行了回顾。     

笼型倍半硅氧烷纳米杂化材料的研究进展

介绍了笼型倍半硅氧烷(POSS)作为一种新型的有机一无机杂化材料,在近10年的研究中引起了极大关注.阐述了POSS单体的结构特点及官能化POSS的合成,并指出了POSS聚合物在催化剂、发光材料、介电材料等领域内的应用前景.     

POSS/PUE纳米复合材料的制备与表征

利用多面体低聚倍半硅氧烷(POSS)对聚氨酯弹性体(PUE)进行了改性,研究了带有不同基团的POSS(八苯基POSS和乙烯基POSS)及不同用量的POSS对聚氨酯性能的影响.结果表明,聚氨酯弹性体的力学性能有一定提高.动态力学测试(DMA)表明,POSS/PUE的储能模量和阻尼性能得到提高,玻璃化转变温度变化不大.热失重分析(TGA)表明,八苯基POSS/PUE和乙烯基POSS/PUE复合材料的初始热分解温度比聚氨酯弹性体分别提高了28.6℃和15℃,材料热稳定性得到提高.通过扫描电镜观察到随着POSS含量的增加其在基体中的分散性下降.     

PMMA nanocomposites and gradient materials prepared by means of polysilsesquioxane (POSS) self-assembly

PMMA nanocomposites were prepared by means of self-assembly of polyhedral oligomeric silsesquioxanes (POSS) such as [Si₈O₁₂(OSiMe₂H)₈] (POSS1) and [Si₇O₉(cyclohexyl)₇(OSiMe₂H)₃] (POSS2) during the free radical methyl methacrylate (MMA) bulk polymerization. The POSS phases separation and self-assembly afforded in situ nanocubes with average diameters ranging from 25 nm to 500 nm. The influence of 5.3 wt.% POSS on the thermal, mechanical and morphological PMMA nanocomposite properties was investigated. POSS mediated nanocube formation was accompanied by improvements of PMMA glass temperature and toughness. Depth profiling by means of ion beam Rutherford backscattering (RBS) analysis indicated the accumulation of POSS1 at the PMMA surface.     

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...     

互穿网络结构PMMA共混体系研究进展

目的 聚甲基丙烯酸甲酯（PMMA）是一种具有良好透光性、耐候性、电绝缘性和加工性能的高分子材料,但也存在脆性大、耐热性差、易黄变和表面易划伤等缺陷,因此通过形成具有互穿网络结构的PMMA来改善其缺陷,从而拓宽PMMA的应用领域。方法 通过文献进行分析,详细阐述顺序型、同步型、Semi型、胶乳型、热塑型和纳米复合型的合成方式,并对具有互穿网络结构PMMA共混体系在导电、功能膜、阻尼、生物医学、涂料等领域的应用进行整理和综述。结论 分析了目前互穿网络结构PMMA共混体系相关研究的不足,并提出PMMA在包装领域代替传统透明材料以及在高层建筑中代替钢化玻璃的应用展望。     

One-pot strategy for covalent construction of POSS-modified silane layer on carbon fiber to enhance interfacial properties and anti-hydrothermal aging behaviors of PPBES composites

In this study, we describe a novel strategy to design and construct POSS-modified silane layer on carbon fiber (CF) to strengthen the interfacial adhesion and anti-hydrothermal aging behaviors of CF-reinforced copoly(phthalazinone ether sulfone)s (PPBES). POSS was first modified by 3-aminopropyltriethoxysilane (APS) to improve chemical reactivity. Without separation and purification, APS-c-POSS was used to functionalize CF to improve reactivity and ensure the covalent linkages between CF and POSS-modified silane layer. CF coated with POSS-modified silane layer was obtained by in situ hydrolysis of APS-c-POSS. FTIR and XPS confirmed the chemical bonds between CF and POSS-modified silane layer. Dynamic contact angle, dynamic wetting test and AFM tests demonstrated that POSS-modified silane coating can increase the wettability and roughness, which could improve interlaminar shear strength and flexural strength of CF/PPBES composites by 17.5 and 30.0% with slight enhancement on tensile strength of CF. The failure mechanisms of CF/PPBES composites with and without POSS-modified silane layer were both investigated by SEM in detail. Moreover, this layer was helpful to dynamic mechanical property and hydrothermal resistance of CF/PPBES composites. This study provides alternate strategy to modify CF with POSS, which will significantly broaden the application field of POSS in advanced composites.     

Study on the mechanical and biological property of PMMA bone cement modified with ultra-fine glass fibers and nano-hydroxyapatite

In this study, polymethylmethacrylate (PMMA) bone cement (BC) was modified with ultra-fine glass fibers (UFGF) and nano-hydroxapatite (nano-HAP) synthesized by hydrothermal method. The results show that when the contents of both UFGF and nano-HAP powders are about 5%, the ultimate tensile strength (UTS), ultimate impact toughness (UIT), tensile strain (TS), and elastic modulus (EM) have been promoted a lot. The interface bond was improved by silicane treatment. Pre-grinding mixture of PMMA, UFGF, and nano-HAP can largely improve the mechanical property of PMMA. The PMMA modified with UFGF and HAP has better bioactivity than that modified with pure UFGF when they share the same content. Nano-HAP powder and modified PMMA were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR).     

碱性EP_b-POSS增韧E-51/DDS环氧树脂的研究

以KH560在碱性条件下水解缩合制备的环氧基倍半硅氧烷(EPb-POSS)为改性剂,对双酚A型环氧树脂(E-51)/4,4′-二氨基二苯砜(DDS)进行改性,制备EPb-POSS/E-51/DDS改性树脂体系,研究该树脂体系的固化工艺和不同含量的EPb-POSS对改性树脂体系力学性能和热稳定性的影响。结果表明,EPb-POSS对改性树脂的固化工艺及其刚性影响不大,但是能显著提高其韧性。POSS含量为1.0%(质量分数)时,改性树脂的冲击强度达到49.2kJ·m2,提高了90.0%,并表现为明显的韧性断裂;弯曲强度132.8MPa,略有提高;初始分解温度378.0℃,提高了26.0℃。     

甲基丙烯酰氧基倍半硅氧烷改性碳纤维/聚芳基乙炔复合材料界面性能

利用微脱粘法、三点弯曲法、扫描电镜（SEM）、力调制模式原子力显微镜（AFM）和动态力学热分析（DMTA）研究了甲基丙烯酰氧基倍半硅氧烷（Methacryl-POSS）涂层改性前后的碳纤维增强的聚芳基乙炔（PAA）复合材料的界面性能。用Wilhelmy法研究了处理前后的碳纤维与PAA树脂的浸润性。结果表明: POSS涂层处理后的碳纤维表面粗糙度增大,与PAA树脂的浸润性提高;复合材料的界面剪切强度提高了36%,层间剪切强度提高了50%。DMTA图谱表明, POSS涂层改性后,复合材料的玻璃化转变温度提高了12℃,损耗因子降低了53%,表明复合材料的界面粘接性能得到大幅度的改善。