共查询到16条相似文献,搜索用时 140 毫秒
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以顺丁烯二酸酐改性的超支化聚酯Boltorn H20、聚四氢呋喃2000和异佛尔酮二异氰酸酯为主要原料合成了超支化水性聚氨酯乳液,研究了改性超支化聚酯Boltorn H20的合成,以及改性超支化聚酯中羧基含量、初聚—NCO/—OH物质的量比、催化剂用量等对制备水性聚氨酯的影响,并探讨了亲水基团含量、乳化温度、中和度等因素对乳液及涂膜性能的影响,进一步使用傅里叶红外和热重分析分别对超支化聚氨酯涂膜的结构和热稳定性能进行了表征及测试。结果表明,在不加催化剂,初聚—NCO/—OH物质的量比为2∶1,亲水基团含量为2.05%的条件下,合成得到的含固量为30%的超支化水性聚氨酯乳液稳定性好。由此得到的超支化聚氨酯薄膜的耐水性和热稳定性较好。 相似文献
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UV固化超支化聚氨酯丙烯酸树脂的研究进展 总被引:1,自引:0,他引:1
超支化聚氨酯是一种新型的功能性树脂,UV固化超支化聚氨酯丙烯酸树脂作为一种新型的涂料成膜物质,具有固化速度快、涂膜性能好、环境污染小等优点,对制备环境友好、性能优异的产品以及用其改性普通的UV光固化树脂具有实际意义,展现出良好的发展前景。本文就国内外有关UV固化超支化聚氨酯丙烯酸树脂的制备方法、固化动力学和固化流变行为等方面的研究工作进行了综述,并介绍了UV固化超支化聚氨酯丙烯酸树脂在改善涂膜力学性能和阻尼性能等方面的应用研究现状,提出完善UV固化超支化聚氨酯丙烯酸树脂的基础研究和在此基础上的相关产品的开发将是今后研究的主要发展方向。 相似文献
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超支化聚氨酯对以PET为基聚氨酯胶片性能的影响 总被引:2,自引:0,他引:2
为改善环氧乙烷-四氢呋喃共聚醚(PET)固体推进剂黏合剂的力学性能,采用超支化聚氨酯(HBPU)与以PET为基聚氨酯(PU)相形成半互穿网络,并测试了PET胶片的力学性能.结果表明,超支化聚氨酯可以明显提高PET胶片的力学性能,超支化聚氨酯改性胶片的延伸率最大达650.14%,是相同R值时空白PET胶片的2.09倍.当R值为1.5时,超支化聚氨酯改性胶片的拉伸强度有显著增加,可以达到1.64 MPa,是空白胶片的2.23倍.超支化聚氨酯对PET胶片起到了很好的增强增韧作用. 相似文献
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New generation polyurethane nanocomposites based on toluene diisocyanate, poly(propylene glycol), hyperbranched polymers (HBPs), and nanosilica were synthesized with the aim of determining the effect of the loading and nature of nanosilica and the functionality of HBP on the structure and properties of polyurethane nanocomposites. Good dispersion of nanosilica at 4 wt % loading in the polymer was confirmed from atomic force microscopy. The properties of the polyurethane nanocomposites were a function of content and nature of the nanosilica in the matrix. The optimum silica loading was 4 wt %. At this loading, tensile strength and storage modulus at 25°C of the nanocomposites increased by 52 and 40%, respectively over the pristine polyurethane. Organo‐treated nanosilica exhibited higher physico‐mechanical properties than the untreated one. With the increase of functionality in the hyperbranched polyol, the tensile strength, thermal stability, and dynamic mechanical properties of the nanocomposites improved. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
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Lei Caihong Xu Ruijie Luo Xiaogang Xie Jiayi 《Polymer-Plastics Technology and Engineering》2018,57(14):1496-1505
In this work, a new kind of compatibilizer was prepared through the reaction between hyperbranched polyurethane and isocyanate-modified silicone oil and its application in the dynamic vulcanized polyurethane and silicone rubber elastomer was investigated. Compared with that of dynamic vulcanized thermoplastic polyurethane (TPU)/silicone rubber elastomer without compatibilizer, the introduction of 3% silicone-modified hyperbranched polyurethane lead to the increase in tensile strength from 8.1 to 13.9?MPa and the tear strength from 56.2 to 75.2 kN/m. The introduction of silicone-modified hyperbranched polyurethane as an interphase layer controller leads to the improvement in properties of TPU/silicone rubber elastomer. 相似文献
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A water‐soluble hyperbranched polyester with a considerable number of hydroxyl terminal groups was synthesized by reacting maleic anhydride and glycerol in the absence of a solvent. The synthesized intermediate product was converted to the hyperbranched polyester by condensation polymerization, and the water by‐product produced during the esterification reaction may be removed by vacuum distillation. In the synthesis process, the crosslinking reaction occurs readily if maleic anhydride is in excess. The result shows that the product synthesized by this one‐step method is insoluble in water at room temperature, whereas the product of a quasi one‐step method, in which pentaerythritol was added as a core molecule, has good water solubility when pentaerythritol and the raw material have a molar ratio of 1 : 100 or 1 : 150. The resulting hyperbranched polyester was purified by column chromatography and characterized by infrared spectrometry. The synthetic hyperbranched polyester was used at 0.5% as a crosslinking agent for acrylic ester to inform acrylic ester latex film; the water absorption of the film was decreased significantly, the viscosity was increased, and some mechanical properties were improved. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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为改善剑麻纤维(SF)与聚丙烯(PP)之间的相容性,在PP/SF复合材料中添加超支化聚酯(H101)、超支化环氧树脂(E102),研究了两种超支化聚合物(HBP)的热稳定性及对PP/SF复合材力学性能、熔体流动性和微观形貌的影响。热重分析表明,所使用的HBP均具有较好的热稳定性;扫描电子显微镜分析发现,HBP的加入使基体与纤维结合得更加紧密;力学性能测试表明,H101可不同程度地提高复合材料的拉伸、弯曲及冲击强度;E102可提高复合材料的拉伸及冲击强度,当E102含量为10%时,与PP/SF复合材料相比,冲击强度提高了72.24%。尽管HBP含量较高时复合材料的力学性能提高,但HBP会降低复合材料的熔体流动速率,选择HBP含量时需要综合考虑。 相似文献