共查询到19条相似文献,搜索用时 171 毫秒
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采用液晶环氧预聚物(PHQEP)与有机蒙脱土(OMMT)共混改性环氧树脂制备三元共混体系的环氧基复合材料。用X射线衍射法(XRD)测试了有机化蒙脱土在被插层前后片层间距的变化,通过DSC、TGA及SEM等对PHQEP/OMMT增韧改性环氧树脂固化体系的力学性能,热性能及微观相态结构进行了研究。结果表明:当PHQEP质量分数为5%,添加1.5%的有机蒙脱土可以使环氧树脂的冲击强度达到最大值23.43 kJ/m2,比纯环氧树脂提高2倍左右,玻璃化转变温度及5%热分解温度比纯环氧树脂分别高出15℃和27℃。PHQEP与OMMT的加入使纳米复合材料的力学性能和热性能得到明显提高。 相似文献
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通过将有机蒙脱土和纳米TiO_2共同添加到环氧树脂中,制备出一种在多项性能上都有大幅提高的高性能多功能有机蒙脱土/纳米TiO_2/环氧树脂复合材料。通过XRD和TEM分析可知,由于利用了有机蒙脱土、纳米TiO_2与环氧树脂间的相互作用,蒙脱土层被高度剥离,所得的二维蒙脱土纳米单片与零维纳米TiO_2颗粒交错分布于树脂基体中。测试表明:有机蒙脱土/纳米TiO_2/环氧树脂复合材料在多项性能上都比纯环氧树脂和有机蒙脱土/环氧树脂复合材料高,拉伸模量分别提高了254.75%和135.69%,拉伸强度分别提高了181.53%和243.46%,弯曲模量分别提高了121.12%和106.04%,弯曲强度分别提高了125.25%和116.98%,缺口冲击强度分别提高了165.57%和137.23%;同时材料的耐沾污性也达到了0级的无污染水平。 相似文献
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利用插层聚合法制备了环氧树脂/有机蒙脱土(EP/OMMT)复合材料.采用XRD对复合材料进行了表征,并研究了复合材料力学性能.实验表明:环氧树脂/有机蒙脱土形成了剥离型的纳米复合材料结构;环氧树脂中加入适量的有机蒙脱土,可以提高环氧树脂的拉伸强度和冲击强度.当经过改性的OMMT质量分数为5%时,EP/钛酸酯偶联剂(Coupler)-OMMT复合材料的拉伸强度达到51.21 MPa,提高了40.26%;当OMMT质量分数为3%时,EP/Coupler-OMMT复合材料冲击强度达25.31 kJ/m2,提高了34.56%. 相似文献
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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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The epoxy resins were toughened by 4–24 phr polyester with average molecular weight 1.9×104 g/mol in this investigation. The mechanical properties were examined and dynamic mechanics analyses were performed for the epoxy resins before and after the modification. The toughening mechanism of polyester to epoxy resin is discussed in light of the scanning electronic microscopy observation of the fracture surfaces. The results showed that the impact strength and tensile strength of the modified epoxy resin were remarkably greater than those of the unmodified cured epoxy resin. The most suitable composition for the modified epoxy resin was the addition of 16 phr polyester, which led to 138 and 46% increments in the impact strength and the tensile strength, respectively. And the mechanical properties depended greatly on the congregating state of polyester added. The polyester dispersing in the epoxy matrix was amorphous when its addition was less than or equal to 12 phr, and was sphere crystals when the addition was over 16 phr. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3384–3389, 2003 相似文献
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In this study, PEL [copolymer of poly(propylene) oxide (PPO) and poly(ethylene oxide) (PEO)] toughening epoxy resin with ionic charge was used to produce an interpenetrating action between the cross‐linking network structure of the epoxy resin and the PEL additive. Fourier transform infrared (FTIR) analysis of the toughening epoxy resin revealed that ? NCO disappeared at 2400 cm?1, ? NH appeared at 3300 cm?1, and ? C?O appeared at 1750 cm?1. These results indicate that a urethane bond was produced. Dynamic mechanical analysis (DMA) and mechanical testing results indicated that as the level of PEL increased, the compatibility between the epoxy resin and PEL also increased. In addition, the compatibility was improved because the addition of cornate hardener produced a graft phenomenon. The tensile property, impact strength, and fracture toughness of PEL toughening epoxy resin all had a tendency to improve. The tensile strength, impact strength, and fracture toughness (KIC value) were most improved when 30 phr cornate was added. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3740–3751, 2002 相似文献
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改性空心玻璃微珠/环氧树脂复合材料力学性能研究 总被引:5,自引:2,他引:3
采用偶联剂对玻璃微珠表面进行改性处理,借助超声波振动,使改性空心玻璃微珠在环氧树脂中均匀、稳定分散,增强了玻璃微珠与环氧树脂之间的相容并探讨了改性空心玻璃微珠对环氧树脂力学性能的影响。结果表明,复合材料中改性空心玻璃微珠添加质量分数为3%时,其拉伸强度达到最大值68.54 MPa,与空白样相比提高了20.3%;冲击强度达到最大值24.42 kJ/m2,比纯环氧树脂提高了166%;KIC(断裂韧性)达到最大值2.338 MPa/m2,是空白试样的2.27倍,增韧效果较为明显。 相似文献
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以4,4′-二氨基二苯砜(DDS)为固化剂,制备出一种剥离型MMT/EP(蒙脱土/环氧树脂)纳米复合材料。采用红外光谱(FT-IR)法、X射线衍射(XRD)法和动态力学分析(DMA)法等对复合材料的微观结构、插层剥离行为、热性能和力学性能等进行了研究。结果表明:MMT对EP分子结构无影响,有利于EP结构和性能的设计,也便于确定其固化工艺。在无促进剂的情况下,当体系中引入5%MMT(相对于EP质量而言)时,复合材料的干态热变形温度、玻璃化转变温度(Tg)、冲击强度和拉伸强度分别提高了39℃、21℃、27.30%和10.50%;适量的MMT能有效提高纳米复合材料的耐湿热性能。 相似文献
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以环氧树脂为基体,苯乙烯-丙烯腈-丁二烯(ABS)树脂为增韧剂,制备了环氧树脂/ABS复合材料,讨论了增韧剂对复合材料的热性能和机械性能的影响。结果表明,ABS的添加可提高复合材料的断裂韧性。扫描电镜结果显示,基体的剪切屈服和橡胶颗粒的微孔洞是ABS增韧环氧树脂的主要增韧机理。 相似文献