共查询到19条相似文献,搜索用时 156 毫秒
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环氧树脂/蒙脱土纳米复合材料的制备及性能 总被引:4,自引:0,他引:4
实验采用长链烷基胺对原始蒙脱土进行有机化处理,再利用环氧树脂对有机蒙脱土插层,制得环氧树脂,蒙脱土纳米复合材料。实验表明,改性环氧树脂的冲击强度有所提高。 相似文献
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研究了蒙脱土/聚氨酯复合材料的阻燃性能,分别从蒙脱土种类、插层温度、插层时间、蒙脱土的用量、复合材料密度等因素,考察了其对蒙脱土/聚氨酯复合材料阻燃性能的影响。利用垂直燃烧法观察火焰高度、燃烧时间的差别。结果表明:采用有机改性纳米蒙脱土,插层温度为100℃、插层时间为4 h、蒙脱土用量为40%,制备而成的蒙脱土/聚氨酯复合材料阻燃性能最佳,燃烧时火焰高度最低,燃烧时间为29 s后自熄。 相似文献
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《涂料工业》2016,(2)
采用端羟基阳离子聚氨酯低聚物作为插层剂对钠基蒙脱土(MMT)进行有机改性,制备出羟基修饰的聚合物蒙脱土。将该改性活性有机蒙脱土(OMMT)作为增强体,制备出聚氨酯纳米片层粒子复合的杂化树脂。以封端型六亚甲基二异氰酸酯(HDI)三聚体为交联剂与上述复合树脂混合,经机械剪切、水乳化得到纳米杂化电泳树脂,经电泳工艺制备出聚氨酯漆膜,漆膜的耐化学腐蚀性得到改善。采用广角X射线衍射(WXRD)、傅里叶变换红外(FT-IR)、热重(TG)分析研究了新型有机蒙脱土的结构与性能。用透射电子显微镜(TEM)表征了杂化聚合物及有机蒙脱土的形态。同时研究了有机蒙脱土添加量对漆膜性能的影响。结果表明:钠基蒙脱土经端羟基阳离子聚氨酯改性后,其层间距由原来的1.309 nm扩大到2.154 nm,当其质量分数为0.3%时,电泳漆膜的耐酸性和耐水性得到较大的改善。 相似文献
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聚氨酯/蒙脱土纳米复合材料制备及其性能研究 总被引:8,自引:1,他引:8
本文采用蒙脱土纳米材料改性聚氨酯,得到了理想的预期效果。通过单体插层,聚氨酯的单体可插层于蒙脱土中,经过多元醇与异氰酸酯的聚合反应制备了聚氨酯/蒙脱土纳米复合材料。用蒙脱土纳米材料改性聚氨酯,研究结果表明:蒙脱土纳米材料不仅提高了聚氨酯的模量,同时又使其强度不下降,密度不增大,这是加入其他刚性粒子所达不到的。同时探讨了聚氨酯/蒙脱土纳米复合材料之所以具有这些优良的力学性能的理论依据。 相似文献
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聚吡咯/有机蒙脱土纳米复合材料的制备及其导电性 总被引:2,自引:0,他引:2
以三氯化铁(FeCl3)为氧化剂,对甲苯磺酸钠(TSANa)为掺杂剂,使进入经有机插层剂改性的有机蒙脱土(OMMT)层间的吡咯(Py)发生氧化聚合反应,制备了具有良好导电性的聚吡咯/有机蒙脱土(PPy/OMMT)纳米复合材料。结果表明,采用插层剂为十八烷基三甲基氯化铵(OTAC)改性的有机蒙脱土OMMT-O,FeCl3与Py的摩尔比为2 14,Py与OMMT-O的质量比为0 24,TSANa的浓度为0 023g·ml-1,在20℃反应6h,得到的PPy/OMMT-O纳米复合材料的电导率达到3 07S·cm-1。XRD测试表明,在形成复合材料过程中PPy已经插层进入到蒙脱土的片层中。 相似文献
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有机蒙脱土改性环氧树脂的研究 总被引:8,自引:0,他引:8
利用离子交换反应制备了有机蒙脱土,用插层聚合法制得了有机蒙脱土/改性环氧树脂纳米复合材料。利用傅立叶红外光谱(FTIR)、X射线衍射(XRD)、元素分析对有机蒙脱土进行了表征,探讨了长链烷基季铵盐类表面活性剂与蒙脱土片层的界面作用对复合材料性能的影响。 相似文献
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由端-NCO基聚氨酯(PU)预聚物与环氧树脂反应,制备了PU接枝改性环氧树脂。着重探讨了PU预聚物的含量、活性稀释剂的含量和异氰酸酯结构等因素,对改性环氧树脂的粘度和粘接性能的影响。实验结果表明,该改性环氧树脂的粘度随着PU预聚物含量的增加而逐渐增大,随着活性稀释剂含量的增加而逐渐降低,而且在相同的条件下,用不同的二异氰酸酯改性环氧树脂的粘度大小次序为:IPDI型>MDI型>TDI型;该改性环氧树脂在PU预聚物含量为20%时,对铝片/铝片的剪切强度最大(7.82 MPa);在PU预聚物含量为10%时,对铁片/铁片的剪切强度最大(11.70 MPa),而且TDI型和IPDI型改性环氧树脂的粘接性能明显好于MDI型改性环氧树脂。 相似文献
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Ye-Shiu Li Ming-Shiu Li Chen-Chi M. Ma Hung-Chung Hsia Der-Shyang Chen 《Polymer International》1994,35(4):371-378
A glycidyl-terminated polyurethane prepolymer was synthesized and used to enhance the properties of epoxy resins. Some properties of glycidyl-terminated PU/epoxy with polyether based (PPG) and polyester based (PBA) glycidyl-terminated PU were investigated in this research. The polyether based glycidyl-terminated PU(PPG) modified epoxy resin proved to be superior to conventional epoxy resins in improved impact strength and fracture energy, but not tensile strength, tensile modulus, flexural strength and flexural modulus. On the other hand, the polyester based glycidyl-terminated PU(PBA) modified epoxy resin had increased mechanical properties while showing slight variation of impact strength and fracture energy. Different mechanisms for this behaviour are advanced in this paper. 相似文献
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本实验选用聚醚二元醇、甲苯二异氰酸酯(TDI)作为原料,合成了聚醚型聚氨酯预聚体。采用该预聚体扩链剂1,4-丁二醇(1,4-BDO)、交联剂三羟甲基丙烷(TMP)对TDE-85/甲基四氢苯酐(MeTHPA)环氧树脂体系行改性。利用扫描电镜分析,探讨了聚氨酯(PU)改性TDE-85/甲基四氢苯酐(MeTHPA)环氧树脂体系结构特征。结果表明,当合成PU预聚体的PPG相对分子质量不同时,改性环氧树脂体系的表面形貌随聚氨酯预聚体加入量的变趋势是相同的。当聚氨酯含量较小时,呈明显的“海岛”结构。随着聚氨酯加入量增多到一定量时,两网络互穿程度高,相分离程度不明显,具有互穿网络聚合物结构特征。随着聚氨酯含量的继续增多,相区尺寸明显增大,两相相容变差,相界面变得较清晰。 相似文献
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Hung-Chung Hsia Chen-Chi M. Ma Ming-Shiu Li Ye-Shiu Li Der-Shyang Chen 《应用聚合物科学杂志》1994,52(8):1137-1151
Glycidol was used to convert the isocyanate-terminated polyurethane prepolymer to glycidyl-terminated polyurethane prepolymer. The modified polyurethane not only offers some distinct advantages over the commercial polyurethane prepolymer, but also enhances the properties of the epoxy resins. The glycidyl-terminated polyurethane modified epoxy resin proved to be superior to conventional epoxy resins in improving impact strength, fracture energy, and adhesion properties. The compatibility of the compounds in this glycidyl-terminated PU/epoxy system was investigated using different preparation procedures. It was found that the synthesized glycidyl-terminated polyurethane prereacted with curing agents, exhibited a lesser degree of phase separation, and can influence the mechanical properties of polymer blends. The results coincide with the phenomena observed in dynamic mechanical analysis and scanning election microscopy. © 1994 John Wiley & Sons, Inc. 相似文献
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聚氨酯改性环氧树脂的研究 总被引:2,自引:0,他引:2
为提高环氧树脂的韧性和粘接强度,采用自制端异氰酸酯聚氨酯预聚体对环氧树脂进行了改性,利用傅里叶变换红外光谱(FT-IR)对聚氨酯预聚体、改性环氧树脂的结构进行了表征。采用示差扫描量热法(DSC)对改性环氧树脂的固化行为进行了分析,并测试了改性环氧的力学性能。结果表明:聚氨酯预聚体与环氧树脂发生了接枝反应,n(NCO)/n(OH)=0.75时,改性环氧树脂/双氰胺/2-甲基咪唑组成的胶膜的剥离强度(液晶显示器(LCD)玻璃与柔性印刷线路板(FPC)界面)达到15.8 N/cm,粘接力良好。 相似文献
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Hydroxyl-, amine-, and anhydride-terminated polyurethane (PU) prepolymer which were synthesized from polyether (PTMG) diol, 4,4′-diphenylmethane diisocyanate (MDI), and a coupling agent bisphenol-A, 4,4′-diaminodiphenyl sulfone (DDS), or benzophenonetetracarboxylic dianhydride (BTDA) were used to modify the toughness of bisphenol-A diglycidyl ether epoxy resin (DGEBA) cured with 4,4′-diaminodiphenyl sulfone. From the experimental results, it was shown that the modified resin displayed a significant improvement in fracture energy (GIC) and also in its interfacial shear strength with polyaramid fiber. It was more enhanced with increase of the PU modifier wt % content. The hydroxyl-terminated PU was found to be the most effective among those three prepolymers. In addition, the toughening mechanism was discussed based on the morphological and the dynamic mechanical behavior of the modified epoxy resin. Fractography of the specimen observed by transmission (TEM) and scanning electron microscopy (SEM) revealed that the modified resin had a two-phase structure. The existence of an unclean fiber surface after its fiber pullout test suggested that a ductile fracture might have occurred. © 1995 John Wiley & Sons, Inc. 相似文献