共查询到17条相似文献,搜索用时 93 毫秒
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新型液晶环氧树脂及其共聚物 总被引:1,自引:0,他引:1
介绍了联苯型液晶环氧树脂脂的合成及其与双马来酰亚胺树脂的共聚物。应用红外光谱、DSC、热台偏光显微镜对环氧树脂和共聚物的液晶行为进行了表征。经对固化行为研究,得到了共聚物固化反应的活化能和凝胶化的数学模型。 相似文献
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液晶双马来酰亚胺/环氧树脂共聚物的制备 总被引:4,自引:0,他引:4
本文采用含柔性链(C10)的液晶双马来酰亚胺和含联苯基的液晶环氧树脂合成共聚物,经FTIR、DSC、偏光显微镜、SEM表征了该共聚物的结构与液晶特征。结果表明该共聚物具有较好热致液晶性,其液晶织态呈向列型织构,亦能保留在交联网络结构中。 相似文献
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含芳酯键双马来酰亚胺的合成与液晶行为 总被引:4,自引:0,他引:4
本文合成了含芳酯键的双马来酰亚胺及其与二苯醚二胺的共聚物。应用FTIR,H-NMR,DTA,DSC,热台偏光显微镜,X-射线衍射研究了该类双马来酰亚胺的结构,热性能和热致液晶行为。研究表明:热固性聚合物的液晶行为随反应程度或交联密度的增大而增强,而且液晶特征能够保留在交联网络中,形成液晶聚合物网络材料。 相似文献
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利用4,4^ -二苯甲烷型双马来酰亚胺(BMD)作为共聚单体与不饱和聚酯(UP)进行共聚改性,对这一共聚体系的性能进行了研究:研究结果表明:双马来酰亚胺的引入对UP树脂的力学性能造成一定影响,尤其显著提高了共聚物热分解温度和热变形温度。从BMD的分子结构来看,BMD是四官能度,而且BMD具有优先与苯乙烯反应生成交替共聚物的倾向,提高了网络交联密度,在宏观上表现为共聚物的热性能及力学性能的变化。另外,红外光谱的分析表明双马来酰亚胺与不饱和聚酯固化形成交联网络。 相似文献
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含芳酰胺键的液晶双马来酰亚胺的合成与表征 总被引:3,自引:0,他引:3
通过对马来酰亚胺基苯甲酸及其酰氯化路线合成了两种含芳酰胺键的液晶双马来酰亚胺Ⅰ b和Ⅱ b;制备了二苯甲烷二胺与液晶双马来酰亚胺Ⅱ b的扩键其聚物Ⅲb。经FTIR、~1H-NMR谱对合成产物的结构进行了表征,表明1710cm~(-1)的酰亚胺羰基和1646cm~(-1)酰胺键,交联反应或扩链反应发生在双马来酰亚胺的双键上。经热分析DTA/DSC及热台偏光显微镜表征了其热性能及液晶相变特征,相变过程是一个非平衡不可逆过程。 相似文献
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以二苯甲烷双马来酰亚胺和二烯丙基双酚A为共聚单体,在适当的催化剂等作用下,制备了一种改性双马来酰亚胺共聚树脂。本文对这种改性的双马来酰亚胺共聚树脂的溶解性能、固化反应动力学和固化机理进行了讨论;对体系固化物的机电热性能及其胶粘剂的高低温粘接性能也进行了研究。 相似文献
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液晶双马来酰亚胺/二胺基二苯醚齐聚物的研究 总被引:2,自引:0,他引:2
采用二胺基二苯醚(DDE)作为扩链剂,合成了含侧甲基的液晶双马来酰亚胺的齐聚物。用FT-IR、1H-NMR、TGA、DSC、HSPM研究了MBMI(液晶马来酰亚胺)与DDE的摩尔比为1:1,2:1,3:1时各种双马来酰亚胺齐聚物的结构、热性能和热致液晶行为,并用红外积分强度法对齐聚物的反应机理进行了探讨。研究表明,共聚反应是通过MBMI与DDE的双键加成反应机理进行的。与液晶双马来酰亚胺(MBMI)相比,其齐聚物的熔点降低,当MBMI与DDE的摩尔比为1:1时,齐聚物的熔点降低最多为64℃,但扩链后对齐聚物的热失重性能影响不大。热台偏光显微镜观察表明,齐聚物有较好的热致液晶特征,并且能够保留在交联网络中形成液晶聚合物网络材料。 相似文献
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Yingfeng Yu Minghai Wang Xiaoyun Liu Lin Zhao Xiaolin Tang Shanjun Li 《应用聚合物科学杂志》2006,101(6):4366-4371
Three kinds of liquid crystalline aromatic azomethine modifiers were synthesized with high yield, and the modification of bismaleimide resin (BMI) with them was studied by scanning electron microscope, polarizing optical microscope, thermogravimetric analyzer, differential scanning calorimetry, and rheolometry. Blends cured at the temperature of liquid crystalline phase were found to have oriented liquid crystal‐rich phase and improved mechanical properties. The addition of o,o′‐diallyl bisphenol A in the blends of BMI decreases thermal properties but shows little effect on phase structures. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4366–4371, 2006 相似文献
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采用二烯丙基双酚A、烯丙基酚醛改性4,4'-二氨基二苯甲烷双马来酰亚胺共聚制备了一类新型的双马来酰亚胺树脂(简称ABD)。以ABD为基体,选用热塑性树脂聚醚酰亚胺(PEI)为增韧剂,采用共混法制备了共聚双马来酰亚胺/聚醚酰亚胺(PEI)树脂体系。采用DSC和流变仪对ABD树脂的固化行为进行了研究,结果表明,该树脂粘度较低,室温下为液态,树脂的冲击强度为8.99 kJ/m2。通过DMA、TGA和扫描电镜对PEI加入量对树脂热性能和微观形貌的影响表明,添加质量分数为15%聚醚酰亚胺时,树脂冲击强度达到16.9 kJ/m2,比基体树脂提高了88%。 相似文献
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Hai‐Liang Zhang Xiaofang Chen Xinhua Wan Qi‐Feng Zhou E
M Woo 《Polymer International》2003,52(1):92-97
Liquid crystalline diblock copolymers with different molecular weights and low polydispersities were synthesized by atom transfer radical polymerization of methyl methacrylate (MMA) and 2,5‐bis[(4‐methoxyphenyl)oxycarbonyl]styrene (MPCS) monomers. The block architecture (coil‐conformation of MMA segment and rigid‐rod of MPCS segment) of the copolymer was experimentally confirmed by a combination of 1H nuclear magnetic resonance and gel permeation chromatograph techniques. The liquid crystalline behaviour of the copolymer was studied using differential scanning calorimetry and polarized optical microscope. It was found that the liquid crystalline behaviour was dependent on the number average molecular weight of the rigid segment. Only those copolymers with Mn(GPC) of the rigid block above 9200 g mol?1 could form liquid crystalline phases higher than the glass transition temperature of the rigid block. The random copolymers MPCS‐co‐MMA were also synthesized by conventional free radical polymerization. The molar content of MPCS in MPCS‐co‐MMA had to be higher than 71% to maintain liquid crystalline behaviour. © 2003 Society of Chemical Industry 相似文献
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The strain-induced crystallization (SIC) behavior of vinylidene chloride/vinyl chloride (VDC/VC) copolymer is reported as a function of the uniaxial extension ratio and the temperature of the rubbery amorphous specimen. The copolymer studied was an 88/12 wt/wt VDC/VC copolymer with a weight average molecular weight of 100,000 containing liquid additives that function as processing aids. It was found that SIC is initiated at an extension ratio of approximately 3.5, independent of the stress and stretching temperature. The growth rate of the crystalline phase increases sharply with extension ratio above 3.5. The crystalline phase growth rate at a given extension ratio also increases sharply with temperature between 15°C and 35°C. The implications of film temperature control during bubble expansion on the blown film process are discussed. 相似文献
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以液晶双马来酰亚胺(IA)为改性剂,制备了 IA 质量含量不同的环氧树脂(EP)/IA 复合材料体系,用冲击强度仪、扫描电镜、热变形温度仪、热失重仪等测试手段对复合材料的力学性能和热性能进行测试分析。结果表明,复合材料的冲击强度均有所提高,当 IA 的含量为0.8%(质量分数,下同)时,冲击强度提高了5.3 kJ/m~2;当 IA 含量为1.5%时,复合材料的热变形温度较纯 EP 提高了12℃,失重5 %时的温度(T5)提高了57℃,失重50%时的温度(T50)提高了45℃。 相似文献