共查询到17条相似文献,搜索用时 93 毫秒
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采用八环氧基笼型倍半硅氧烷(G–POSS)与双酚A型氰酸酯树脂(CE)共混制备了高性能CE/G–POSS杂化材料,考察了不同G–POSS含量时杂化材料的力学性能、热性能、介电性能和耐湿性。结果表明,G–POSS改性的CE断面存在大量波纹状和鱼鳞片状结构,增加了材料的韧性,当G–POSS含量为7份时,杂化材料的冲击强度达到最大值23.8 kJ/m2,比纯CE提高了158%;当G–POSS含量为4份时,杂化材料的介电常数由3.27下降到3.05,达到最小;随着G–POSS含量的增加,杂化材料的耐热性和耐湿性均有所下降。 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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以自制的两种不同黏度的环氧基倍半硅氧烷(POSS)为改性剂,对双酚A型环氧树脂(EP)/4,4’–二氨基二苯砜(DDS)进行改性,制备EP/POSS杂化材料。再以纳米SiO2为填料制备了EP/POSS/SiO2纳米复合材料。结果表明,与EP相比,杂化材料和纳米复合材料的弯曲强度和弯曲弹性模量都有所提高,其中纳米复合材料(分别添加低黏度和高黏度的POSS)的弯曲弹性模量分别提高了15.03%和9.44%,添加高黏度的POSS和纳米SiO2后其杂化材料和纳米复合材料体系的弯曲强度均有所提高,杂化材料和纳米复合材料的最大分解温度和在高温时的热残留量都有所提高。 相似文献
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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。 相似文献
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烯丙基异丁基聚多面体低聚倍半硅氧烷/聚丁二烯纳米杂化材料的合成及表征 总被引:2,自引:0,他引:2
采用负离子聚合法,以单官能团笼型烯丙基异丁基聚多面体低聚倍半硅氧烷(POSs)和丁二烯为单体、正丁基锂为引发剂、环己烷为溶剂、乙基四氢糠基醚(ETE)为调节剂,制备烯丙基异丁基POSS/聚丁二烯纳米杂化材料,并对其结构进行了表征.结果表明,在烯丙基异丁基POSS和丁二烯之间发生了共聚合反应,实现了活性负离子引发聚合制备POSS/聚丁二烯纳米杂化材料;ETE可有效调节1,2-聚丁二烯结构的含量;随着烯丙基异丁基POSS用量的增加,纳米杂化材料的重均相对分子质量逐渐降低. 相似文献
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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。 相似文献
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Octa‐vinyl polyhedral oligomeric silsesquioxane (V‐POSS) and octa‐(methacryloxy) propyl polyhedral oligomeric silsesquioxane (M‐POSS) were incorporated into PMMA to prepare POSS/PMMA hybrid materials at molecular level via in situ polymerization. The resulting hybrid materials showed only swelling instead of solution in ethyl acetate, while pristine PMMA completely dissolved in ethyl acetate; moreover, the M‐POSS/PMMA hybrid materials exhibited more excellent resistance to solvent stress cracking. An excellent transparency was observed for all hybrid materials. Incorporation of V‐POSS and M‐POSS significantly improved thermal properties of PMMA. The thermal decomposition temperature of hybrid materials was enhanced except a slightly compromised initial decomposition temperature. The hybrid materials prepared with 0.2–0.6 mol% M‐POSS or V‐POSS improved the reinforcing and toughening properties in comparison to pristine PMMA. Also, the incorporation of POSS decreased the dielectric constant and dielectric loss of the hybrid materials with more voids introduced into the composites no matter the structure of POSS. POLYM. ENG. SCI., 55:565–572, 2015. © 2014 Society of Plastics Engineers 相似文献
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Phosphorus‐containing polyhedral oligomeric silsesquioxane/polyimides hybrid materials with low dielectric constant and low coefficients of thermal expansion
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Novel phosphorus‐containing polyhedral oligomeric silsesquioxane (POSS)/polyimides (PI) hybrid materials with low dielectric constant and low linear coefficients of thermal expansion (CTE) were prepared and characterized. The POSS/PI hybrid materials were synthesized with octa(aminopropyl)silsesquioxane (OAPS) and a series of phosphorus‐containing polyamide acids(PAA). The PAAs were synthesized with bis(4‐aminophenoxy) phenyl phosphine oxide (BAPPO), 4,4’‐diaminodiphenyl ether (ODA) and 3,3',4,4'‐biphenyl tetracarboxylic diandhydride (BPDA). The structures and properties of the hybrid materials were characterized. And the effect of the phosphorus‐containing structure on the POSS/PI hybrid materials was discussed. The dielectric constants and CTE of the hybrid materials were remarkably lower than that of the unmodified POSS/PI films. The lowest values of dielectric constant and CTE could achieve as low as 2.64 (1 MHz) and 27.45 ppm/K. Besides, the hybrid materials also had excellent thermal properties. The highest 5% weight loss temperature of the hybrid materials was as high as 580°C under air. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42611. 相似文献
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采用八乙烯基倍半硅氧烷(OV-POSS)通过原位聚合法制备了POSS/PMMA杂化材料。通过FTIR、SEM,EDS以及力学性能和透光性雾度的测定等方法对杂化材料的结构和性能进行了表征。结果表明,POSS的加入对PMMA可见光的透过性无影响。POSS含量较低时,POSS的引入能明显改善材料力学性能,但当POSS含量较高时,力学性能下降。当POSS的含量为0.6%时,与纯的PMMA相比,断裂伸长率略有降低,降低了5.8%,然而,其他力学性能均有提高,其中,拉伸模量和强度分别提高了22.7%和32.0%,弯曲强度和模量分别提高了9.8%和27.0%。 相似文献
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环氧基POSS/PAMAM杂合材料的制备及性能研究 总被引:1,自引:0,他引:1
以3-缩水甘油基氧丙基三甲氧基硅烷(EPTMS)为原料,合成得到了八官能团缩水甘油醚-多面体低聚倍半硅氧烷(简称POSS-EP)。采用4代树型端氨基聚酰胺-胺(PAMAM)作为POSS-EP和双酚A型环氧树脂(DGEBA)共混物的固化剂,制备了5个环氧基POSS/PAMAM杂化材料。通过动态差示扫描量热仪(DSC),研究了环氧和PAMAM的固化反应动力学。通过DSC、热重分析(TGA)、拉力和冲击测试,对环氧基POSS/PAMAM杂化材料的热性能和力学性能进行了研究。结果表明,该环氧基POSS/PAMAM杂化材料具有优良的热性能和力学性能。 相似文献
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Yie‐Chan Chiu I‐Chen Chou Hsieh‐Chih Tsai Linawati Riang Chen‐Chi M. Ma 《应用聚合物科学杂志》2010,118(6):3723-3732
The side‐chain polyhedral oligomeric silsesquioxane (POSS)‐type epoxy (IPEP) hybrid material was synthesized, and the particle sizes of the POSS segment were less than 5 nm and which particles dispersed uniformly. The 3D AFM microphotograph of the IPEP/DGEBA (diglycidyl ether of bisphenol A) hybrid material exhibited the unique “island” shape, and their XRD pattern displayed amorphous halo structure. The POSS segments of the IPEP could improve the thermal degradation activation energies. Additionally, introduction of the IPEP into the DGEBA could improve the char yield and provide the antioxidation property in the air atmosphere. The char yields of the IPEP/DGEBA hybrid materials could improve from 14.48 to 19.21% and from 0.18 to 1.17% in the nitrogen and air atmospheres, respectively. The IPEP segments could also improve the hardness when the IPEP contents of the IPEP/DGEBA hybrid materials were less than 50 wt %. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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有机/无机杂化材料的改性及应用是目前材料科学中最富有活力的研究领域之一。其中笼型倍半硅氧烷(Polyhedral oligomeric silsesquioxane,POSS)在分子水平上实现了有机组分与无机组分的结合,结构呈硅氧骨架连接的立体笼型,具有优异的反应活性、耐热阻燃性、多孔性和纳米尺寸效应等特性,通过化学改性可将其应用在多个领域。本文主要从官能团改性、聚合改性和配位改性三个方面阐述了POSS的改性方法,综述了POSS在耐热材料、阻燃材料、增强材料和多孔材料等领域的应用研究进展,并对POSS今后的研究方向提出了展望。可从POSS的构效关系、改性方法以及安全性等方面进行更加深入和系统的研究,以促进POSS材料更广泛的应用。 相似文献