共查询到18条相似文献,搜索用时 109 毫秒
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超支化环氧树脂的合成及应用研究进展 总被引:1,自引:0,他引:1
从超支化环氧树脂独特的结构特点出发,详细介绍了超支化环氧树脂的分类、合成方法及合成路线,列举了超支化环氧树脂合成的最新思路和进展;介绍了超支环环氧树脂在环氧树脂增韧、复合材料中的应用,阐述了增韧机理并列举了应用实例;最后总结了超支化环氧树脂合成和应用的发展方向,力求为广大科研工作者提供帮助和借鉴。 相似文献
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超支化环氧树脂的研究进展及应用前景 总被引:3,自引:3,他引:0
综述了各类超支化环氧树脂的合成工艺,主要包括聚酯型、聚醚型、聚酯聚醚型和聚烷烃超支化环氧树脂.超支化环氧树脂的合成工艺主要有缩水甘油直接法、环氧氯丙烷间接法、原子基团转移聚合法、双键加成法.对每种超支化环氧树脂的合成工艺、产品特征进行分析.提出了超支化环氧树脂在热固性材料、胶粘剂和作为无溶剂树脂等领域的应用前景. 相似文献
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超支化聚合物增韧环氧树脂的研究进展 总被引:6,自引:0,他引:6
介绍超支化聚合物的结构及特点,着重综述了超支化聚合物增韧改性环氧树脂的研究进展,指出了超支化聚合物在环氧树脂改性方面的发展方向。 相似文献
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《应用化工》2022,(5)
采用质子转移聚合法成功制备了超支化环氧树脂,并通过丙烯酸对其端基进行化学改性合成了一种新型的超支化环氧丙烯酸酯,采用FTIR、1H NMR对产物结构进行了表征。通过控制投料比及测定产物酸值来监测反应进行的程度,使生成的超支化环氧丙烯酸酯中既含有环氧基又含有碳碳双键,使之兼具阳离子型光聚合与自由基型光聚合的协同作用。测试了超支化聚合物在氯仿中的紫外-可见光谱和荧光发射光谱,超支化环氧树脂和超支化环氧丙烯酸酯的荧光发射波谱出峰位置分别为314 nm和311 nm。研究表明,超支化聚合物具有较强的荧光性能,作为光固化材料在光学、医疗器件、防伪等领域具有潜在的应用价值。 相似文献
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Yongsung Eom Louis Boogh Véronique Michaud Jan-Anders Månson 《Polymer Composites》2002,23(6):1044-1056
The development of internal stress during cure of epoxy and hyperbranched polymer-modified epoxy resins was characterized, taking into account the evolving viscoelastic properties, the volumetric shrinkage due to the chemical reaction, and the thermal expansion. A criterion for void formation during cure in a constrained mold was proposed, providing guidelines for the construction of a process window for manufacturing of void-free composites. It was shown that the internal stress development in epoxy resins during cure is strongly influenced by the presence of hyperbranched polymer modifiers. The role of these modifiers was illustrated for the case of autoclave processing of glass fiber/epoxy composites. This study showed that higher fiber volume fractions could be used with hyperbranched polymer-modified resins than with unmodified resins, for producing void-free laminates. It also appeared that by suitable tailoring of the process cycle, a fully stress-free laminate could be obtained after cure, using the modified resin. 相似文献
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Aliphatic epoxy resin (UVR6105) and epoxidized aromatic hyperbranched polymers (HBP) were used as dental resin matrixes, siliane‐treated inorganic nanoparticles as inorganic fillers, ethyl 4‐dimethylaminobenzoate, camphorquinone, and 4‐[(2‐hydroxytetradecyl)oxy] phenyl‐phenyliodoniumhexafluoroantimonate (CD1012) as initiators to formulate new kinds of dental nanocomposites. Their physical and mechanical properties were tested and the inner structure was observed by using scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. The 7 series thermal analysis system was used to determine the glass transition temperature of dental resins. Compressive strengths of dental nanocomposites are lower, diametral tensile strengths are comparable with, flexural strengths are higher than those of commercial hybrid composite (Spectrum‐TPH). The addition of HBP decreased the glass transition temperature of aliphatic epoxy resin. SEM photo micrograph shows that the nanoparticles were well dispersed and inlayed in the resin matrixes. TEM photo micrograph shows that the inner structure of dental resins presents club‐shaped. Epoxidized aromatic hyperbranched polymer can strengthen and toughen aliphatic epoxy resin. These nanocomposites are potential for dental application. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers 相似文献
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环氧树脂增韧改性技术研究进展和新方法及其机理 总被引:2,自引:0,他引:2
简单介绍了环氧树脂技术的研究进展和近期的主要应用,并概述了环氧树脂的改性技术.主要介绍了增韧改性的一些新方法,包括热塑性树脂增韧、互穿网络增韧、热致性液晶增韧、原位聚合增韧、核壳结构聚合物增韧等,主要介绍了用橡胶弹性体、热塑性树脂、刚性粒子、核壳型结构聚合物来增韧环氧树脂,以及环氧树脂绝缘性、耐湿热性和阻燃性等的改进方法,并对其中的增韧机理作了总结分析.最后本文综述了环氧树脂增韧改性技术发展及其未来展望. 相似文献
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A novel epoxidized hydroxyl-terminated hyperbranched polymer (HPEEX) was formulated from epichlorohydrin and hydroxy-terminated hyperbranched polyester (HPE) based on trimethylol propane (TMP) and AB2 monomer. The obtained HPEEX was characterized with FT-IR, 1HNMR spectroscopy, TG, WAXD and GPC analysis. Results showed that the HPEEX was formulated as expected and its molecular weight and intrinsic viscosity were 3,789 g/mol and 3.96 mL/g, respectively. Meanwhile, the HPEEX was used as cross-linking agent in the preparation of waterborne epoxy resins. Performance of the HPEEX modified epoxy resin aqueous (EP-H) dispersions and their films was evaluated by various tests. It was found that with incorporation of hyperbranched polymer into the epoxy macromolecular chain, the EP-H films exhibited excellent hardness and water-proof performance: the hardness was as high as 96 (Shore A), and the contact angle of water on the surface of this kind of film was as high as 71°, resulting from branched structure, higher functionality of HPEEX, better cross-linking density and large number of hydrogen bonding in this epoxy system. 相似文献