氨基POSS/环氧树脂有机无机杂化材料的动态力学性能

为了提高环氧树脂(EP)的综合性能,以含氨基官能团的笼型倍半硅氧烷(POSS)作为EP的改性剂,得到有机-无机POSS改性EP杂化树脂;然后以4,4′-二氨基二苯基砜(DDS)为固化剂对杂化树脂进行固化,得到有机-无机杂化材料。重点考察了POSS含量对杂化材料动态力学性能的影响。结果表明:不同杂化材料体系均呈单相结构,POSS在EP基体中分散较均匀,说明两者间相容性良好;随着POSS含量的不断增加,杂化材料体系的玻璃化转变温度(Tg)增大,与传统杂化材料不同的是损耗峰强度随POSS含量增加而降低,但损耗峰宽度几乎不变。     

PA6/POSS纳米杂化材料的结构与性能

采用熔融共混方法,用环氯官能化笼型倍半硅氧烷(POSS)改性聚酰胺(PA)6,制备了PA 6/POSS纳米杂化材料.研究表明:环氧化POSS可在一定程度上改善PA 6的低温抗冲击性能,在w(POSS)低于3％时,可提高杂化材料的拉伸强度.此外,环氧化POSS可显著改善杂化材料的介电性能,将环氧化POSS加入PA 6基体...     

POSS/聚合物有机-无机杂化材料的研究进展

介绍了笼型倍半硅氧烷(POSS)的特点。综述了POSS/聚合物杂化材料近年来的研究进展(包括POSS/环氧树脂杂化材料、POSS/聚酰亚胺杂化材料、POSS/有机硅杂化材料、POSS/聚乙烯杂化材料、POSS/聚丙烯杂化材料和其他类型含POSS的杂化材料等),并对其应用前景进行了展望。     

八环氧基笼型倍半硅氧烷/EP杂化材料的制备及性能研究

以三乙烯四胺(TETA)为固化剂,采用共混法制备八环氧基笼型倍半硅氧烷(G-POSS)/环氧树脂(EP)杂化材料。研究了环氧基POSS含量对杂化材料的固化反应、介电性能、力学性能及热性能等影响,并对杂化材料的微观相态结构进行了表征和分析。结果表明,G-POSS的引入提高了EP的反应活性,制备的杂化材料透明性良好,力学性能、介电性等都有所提高;且当m(G-POSS)m∶(EP)=20 1∶00时,杂化材料的介电性能、力学强度和刚性提高较为明显,且其断面形貌呈韧性断裂。其拉伸强度为67.8 MPa、断裂伸长率为3.44%、弯曲强度为116.7 MPa,与纯EP相比,分别提高了83.20%、320.13%、49.17%。     

纳米SiO2/聚醋酸乙烯酯杂化乳液的性能研究

采用半连续乳液聚合工艺,合成了纳米二氧化硅(SiO2)改性聚醋酸乙烯酯(PVAc)有机/无机杂化乳液。研究了纳米SiO2添加量对聚醋酸乙烯酯乳液聚合稳定性、贮存稳定性、黏度、粘接强度的影响。结果表明,经超声处理的SiO2粒子加入乳液中乳胶粒分散状态良好,合成的SiO2/PVAc复合乳液放置6个月未产生凝聚、分层等不稳定现象;乳液黏度随SiO2含量增加由532.0mPa·s降低为343.0mPa·s。扫描电镜(SEM)观察,纳米SiO2改性PVAc乳液分散均匀,乳胶颗粒聚集现象减少,压缩剪切强度随纳米SiO2含量的增加呈先增大后减小的趋势,用量为6‰时可达10.28MPa。     

PEG/POSS纳米杂化水凝胶的制备及性能研究

以PEGDA(聚乙二醇丙烯酸酯)和PMMA-POSS(八甲基丙烯酸甲酯笼型倍半硅氧烷)为原料,采用UV(紫外)交联法制备了系列PEG/POSS纳米杂化水凝胶。研究结果表明:引入POSS后,纳米杂化水凝胶的SR(溶胀比)降低、力学性能显著提高;引入POSS后,杂化水凝胶具有更小的孔洞结构、孔隙排列更规整;PEG/POSS纳米杂化水凝胶具有良好的生物相容性和吸水性。     

环氧树脂/倍半硅氧烷共混材料的性能研究

通过三烷氧基硅烷水解缩聚反应制备了甲基倍半硅氧烷(MSSQ)单体和乙基倍半硅氧烷(ESSQ)单体,采用红外光谱、核磁共振、元素分析对其进行表征,证实了倍半硅氧烷(SSQ)的立体结构。采用共混法制备了环氧树脂(EP)/SSQ和EP/纳米SiO2共混材料,性能测试结果表明,相对于纯EP及EP/纳米SiO2共混材料,EP/SSQ共混材料具有较高的玻璃化转变温度、热变形温度、热稳定性及力学性能。     

聚丙烯/正辛基POSS纳米复合材料流变与性能性研究

摘要：为研究正辛基笼型倍半硅氧烷(O-POSS)对等规聚丙烯(iPP)的改性作用,合成了O-POSS并将其与iPP共混制备了iPP/O-POSS纳米复合材料,研究了O-POSS用量对复合材料的流变性、力学性能和结晶行为的影响。结果表明：O-POSS加入可改善聚丙烯材料的流动性,融体假塑性增强。加入O-POSS球晶尺寸变小,熔点和结晶度提高,且有助于改善材料力学性能,O-POSS硅笼含量为4% 到6%时,复合材料有最好的力学性能。     

纳米SiO2/桐油基环氧树脂复合材料的制备及性能

通过制备环氧化桐油酸甲酯,并将其与E51环氧树脂共混,得到桐油基环氧树脂。再用硅烷偶联剂KH-570改性纳米SiO₂,并以不同的质量比添加到桐油基环氧树脂中,探究不同纳米SiO₂含量在力学性能、接触角以及耐磨损性能上对桐油基环氧树脂复合材料的影响。结果表明：质量比为6%的纳米SiO₂的桐油基环氧树脂复合材料的拉伸和冲击强度都得到了提高,冲击强度较未加入纳米SiO₂提高了53.3%,水接触角也从93.3°提高到104.76°,并且添加纳米SiO₂之后复合材料的耐磨损性能也随之增强。     

离子型聚合反应机理制备聚合物/POSS纳米杂化材料的研究进展

多面体低聚倍半硅氧烷（POSS,Polyhedral Oligomeric Silsesquioxane）作为一种特殊的有机/无机杂化纳米粒子备受关注。本文综述了国内外通过离子型反应机理制备聚合物/POSS纳米杂化材料的一些进展,着重介绍反应机理、特点,并对这一领域的前景进行了展望。     

POSS/PMMA纳米复合材料的制备及性能

将笼形纳米粒子八己烯基多面低聚倍半硅氧烷(Oh-POSS)与聚甲基丙烯酸甲酯(PMMA)通过溶液共混法制备无机/有机纳米复合材料.利用FTIR对复合材料的结构进行表征.SEM观察结果显示:当Oh-POSS含量较小时,复合材料薄膜具有较为平整的表面,无机粒子Oh-POSS均匀地分散在PMMA基体之中;随着Oh-POSS含量的增加,Oh-POSS逐步发生聚集现象.TGA、DSC以及拉伸试验结果表明:Oh-POSS含量较低时,Oh-POSS的引入能明显改善材料的热稳定性和力学性能,但当Oh-POSS含量较高时,热学和力学性能下降.     

POSS/PS纳米复合微球的制备与热性能研究

采用乳液共聚法合成了POSS/PS纳米复合微球,研究了反应条件对复合材料热性能的影响.结果表明,合成的微球形态规则、尺寸分布较均匀,微球具有核壳型结构,尺寸可调,微球尺寸可控制在50nm左右.通过共聚引入刚性POSS结构,使得POSS/PS纳米复合材料的玻璃化温度显著高于纯PS,耐热性明显改善.     

环氧树脂/二氧化钛纳米复合材料的制备及性能

以纳米ＴｉＯ２ 为填料制备了环氧树脂／ 二氧化钛（ＥＰ／ＴｉＯ２） 纳米复合材料,研究了纳米ＴｉＯ２ 对复合材料性能的影响,结果表明,纳米ＴｉＯ２ 经表面处理后,可对环氧树脂实现增强、增韧,当填充质量分数为３ ％ 时,材料的拉伸弹性模量较ＥＰ提高３７０ ％ ,拉伸强度提高４４ ％ ,冲击强度提高８７８ ％ ,其他性能也有明显提高。     

稻壳SiO2/环氧树脂纳米复合材料的吸水性及弯曲性能

将稻壳用酸处理后在600℃焚烧得到纯度为99.3%,比表面积为212 m2/g的SiO2,用偶联荆γ-氨丙基三乙氧基硅烷(KH550)改性后,SiO2的平均粒径为60 nm.将改性后的稻壳SiO2与环氧树脂(EP)复合,考察稻壳SiO2含量为1%、3%、5%、10%时复合材料在不同温度下的吸水率和弯曲性能,并探讨偶联剂KH550的用量、材料的孔隙率对吸水性的影响.结果表明:稻壳SiO2/EP纳米复合材料的吸水性先随SiO2含量增加而增加,当SiO2质量含量为10%时开始下降.温度和材料中孔隙含量增加使复合材料的吸水率增加,而KH550用量增加能降低吸水率.此外不同组成的复合材料弯曲性能优于纯EP树脂,相同SiO2含量的复合材料,弯曲性能提高幅度依赖于偶联剂的用量.     

State-of-the-Art Overview on Polymer/POSS Nanocomposite

Research into polymer containing polyhedral oligomeric silsesquioxane has been expanded during the past years, enlightening new categories of polymer/polyhedral oligomeric silsesquioxane nanocomposite and unanticipated applications. These hybrids own superior structural and functional properties (strength, thermal stability, optical features, low toxicity, biocompatibility) due to nanometer size of polyhedral oligomeric silsesquioxane. The state of polyhedral oligomeric silsesquioxane-reinforced polymeric [poly(methyl methacrylate, poly(vinyl chloride), polyurethane, polyamide, epoxy, and poly(ethylene glycol)] systems are reviewed in this article. Physical blending, covalent bonding, and chemical cross-linking have been used to provide excellent reinforcement. A comprehensive coverage of various appliances of polymer/polyhedral oligomeric silsesquioxane nanocomposite has been given particularly aerospace, semiconducting material, biomedical, and textile industry.     

Synthesis of EP‐POSS mixture and the properties of EP‐POSS/epoxy,SiO2/epoxy,and SiO2/EP‐POSS/epoxy nanocomposite

The hybrid material of EP‐POSS mixture was synthesized by the hydrolysis and condensation of (γ‐glycidoxypropyl) trimethoxysilane. A series of binary systems of EP‐POSS/epoxy blends, epoxy resin modified by silica nanoparticles (SiO₂/epoxy), and ternary system of SiO₂/EP‐POSS/epoxy nanocomposite were prepared. The dispersion of SiO₂ in the matrices was evidenced by transmission electron micrograph, and the mechanical properties, that is, flexural strength, flexural modulus, and impact strength were examined for EP‐POSS/epoxy blends, SiO₂/epoxy, and SiO₂/EP‐POSS/epoxy, respectively. The fractured surface of the impact samples was observed by scanning electron micrograph. Thermogravimetry analysis were applied to investigate the different thermal stabilities of the binary system and ternary system by introducing EP‐POSS and SiO₂ to epoxy resin. The results showed that the impact strength, flexural strength, and modulus of the SiO₂/EP‐POSS/epoxy system increased around by 57.9, 14.1, and 44.0% compared with the pure epoxy resin, T_i, T_max and the residues of the ternary system were 387°C, 426°C, and 25.2%, increased remarkably by 20°C, 11°C and 101.6% in contrast to the pure epoxy resin, which was also higher than the binary systems. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 810‐819, 2013     

PS/SiO2复合型纳米粒子的制备研究

进行了PS(聚苯乙烯)／SiO2复合型纳米粒子的制备研究。结果表明：将SiO2,的偶联剂表面处理从干法预处理改为原位处理,不仅可以使SiO2表面接枝效率有大幅度的提高,还解决了实验中的重复性差的问题;TEM、FT-IR、TGA分析以及接枝效率的结果均证明,在该方法的条件下,所加入的单体几乎全部被接枝在SiO2的表面上,形成了平均直径为40m左右,以SiO2为核,以PS为壳,且核壳间以共价键相接的包覆型纳米粒子;通过加入适量的缓冲剂,并调节合适的加料工艺,可进一步提高纳米粒子的制备效率,体系的固含量可达45％。     

SiO2/聚丙烯酰胺类杂化材料的合成研究进展

介绍了SiO2／聚丙烯酰胺类杂化材料的各种制备方法,并对SiO2／聚丙烯酰胺类杂化材料的研究作了展望。     

Nanotailoring of Nanocomposite Hydrogels Containing POSS

The development and commercialization of nanoparticles such as nanoclays, carbon nanotubes and polyhedral-oligomeric-sil-sesquioxanes (POSS) offer new possibilities to tailor hydrogels in the nanometer scale range. Due to the large surface area of the nanosize particles, only small amounts are needed to cause significant changes in hydrogels properties. Properties affected include swelling behavior and thermo-mechanical properties. Experimental results showed that only small amounts of POSS (<5 wt%) were needed to enhance the storage modulus and the swelling ability compared with that of the pure Poly(N-vinyl-2-pyrrolidone itaconic acid) hydrogel. In the case of epoxy functionalized POSS incorporated into the hydrogel, the weight swelling increased by more than 120% while the volumetric swelling by 350%. In addition the storage modulus increased by 300% compared to the neat hydrogel. The results led to the conclusion that the incorporation of functionalized POSS particles in hydrogels could improve the hydrogel properties.     

EP树脂/Mt纳米复合材料的制备与性能研究

以双酚Ａ型环氧（ＥＰ０树脂为基体,有机胺处理蒙脱土（Ｍｔ）为增强剂,制备了ＥＰ树脂／Ｍｔ纳米复合材料。通过热重分析、Ｘ射线衍射、透射电子显微镜等方法对纳米复合材料的制备条件进行了优化,对聚合物基纳米复合材料的结构、力学性能、热性能进行了表征。