共查询到19条相似文献,搜索用时 156 毫秒
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以三羟甲基丙烷(TMP)为交联剂,先用环氧树脂改性聚氨酯(PU),得到环氧树脂改性的水性聚氨酯(WPUE)分散体,然后加入甲基丙烯酸甲酯(MMA)和引发剂偶氮二异丁腈(AIBN),通过自由基乳液聚合得到聚氨酯-环氧树脂-丙烯酸酯(WPUEA)杂合分散体,并通过傅里叶红外光谱、凝胶渗透色谱、粒径分析仪和透射电镜对其进行了表征。研究了-NCO/OH总摩尔比、交联剂TMP的量、环氧树脂种类和量、MMA的量等对WPUEA杂合分散体性能以及涂膜性能的影响。实验结果表明,选用E20环氧树脂,当-NCO/OH总摩尔比为12~15, TMP的添加量为4%~8%,E20添加量为4%~6%,MMA添加量为10%~30%时得到WPUEA杂合分散体性能较佳,所得到的水性WPUEA杂合分散体的涂膜硬度为073,光泽度达到85,表干时间为30min,冻融循环大于5,同时耐水性和耐溶剂性均得到提高。该产品可以取代溶剂型产品。 相似文献
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将2,4-二羟基苯甲醛(DDBA)作为扩链剂,丙烯酸羟乙酯(HEA)作为封端剂制备了含有醛基的水性聚氨酯(DPU),在温和的条件下引入羧甲基化壳聚糖(CMCh)合成了聚氨酯-CMCh席夫碱,再由自由基聚合法引入聚丙酰胺合成了聚氨酯-羧甲基壳聚糖席夫碱水凝胶(DPU-Ch)。通过FTIR、SEM、力学性能、溶胀保水试验、抗菌试验和血液相容性测试等对水凝胶结构和性能进行表征。结果表明,水凝胶的机械性能随着CMCh质量分数的增加而提升,同时水凝胶也显示出良好的溶胀能力和保水能力;当CMCh添加量为2%时,水凝胶对革兰氏阳性和阴性细菌菌株均显示出良好的抗菌性能;水凝胶溶血率均低于5%表明其具有良好的细胞相容性,NIH3T3细胞存活率在90%以上证明其没有细胞毒性,因此在生物医疗领域中具有潜在的应用前景。 相似文献
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以聚己内酯1000(PCL1000)、异佛尔酮二异氰酸酯(IPDI)、2,2-双(溴甲基)-1,3-丙二醇、叠氮化钠(NaN3)等为原料合成了侧链带有叠氮基团的可点击聚氨酯预聚体,以1,1,3,3-四甲基胍(TMG)、3-溴丙炔合成了抗菌单体2-炔丙基-1,1,3,3-四甲基胍(TMG-Al),随后以点击反应为连接策略制备了环保水性接触型抗菌聚氨酯。采用红外光谱(FTIR)、核磁共振波谱(NMR)表征了小分子单体的化学结构;通过抑菌圈实验验证了涂膜的接触型抗菌效果及非渗透特性,为接触型抗菌领域的研究提供了一种新的合成方法。抗菌结果显示,当水性聚氨酯中引入质量分数为5%的TMG-Al时,抗菌聚氨酯即可对革兰氏阴性菌(大肠杆菌)及革兰氏阳性菌(金黄色葡萄球菌)产生显著的杀灭效果,抗菌率达99.9%。 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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分析了不同的助交联剂对过氧化物硫化聚丙烯/乙烯-丙烯-二烯共聚物(EPDM)热塑性弹性体力学性能、流变性能、热稳定性能的影响,结果表明:不同的助交联剂均有提高凝胶含量和改善聚丙烯(PP)降解程度、提高力学性能的用途。其中,三羟甲基丙烷二烯丙基醚(TMPDE)作为过氧化物硫化PP/EPDM的助交联剂,相比三烯丙基异氰脲酸酯(TAIC)、邻苯二甲酸二烯丙酯(DAP)和三羟甲基丙烷三丙烯酸酯(TMPTA),所得制品综合力学性能优异,热稳定性能提高,流动性改善,微观结构均匀。 相似文献
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以端羟基丁腈液体橡胶(HTBN)和聚四氢呋喃醚二醇(PTMG)共混软段并加入交联剂,制备一系列聚氨酯弹性体(PUU),对其力学性能进行测定,并采用差示扫描量热分析(DSC)和热失重分析(TG)对材料进行热力学分析。结果表明,HTBN与PTMG以8:2的质量比共混时,制得的PUU的拉伸强度为25MPa,耐热性能也较优越;用三羟甲基丙烷(TMP)为交联剂制得交联网络结构的PUU,力学性能和热性能都有所提高;2,5-二甲基-2,5-双(叔丁过氧基)己烷(简称双二五)打开HTBN主链上的双键,进一步加强了聚氨酯的交联,使其力学及耐热性能进一步提高。 相似文献
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E-300与MOCA扩链聚氨酯弹性体的力学性能比较 总被引:6,自引:1,他引:5
以聚酯(PEA、PEPA、PCL)或聚醚(PTMG、PPG、PO/PT)和TDI为原料合成聚氨酯(PU)预聚体,分别用MOCA和E-300作扩链剂制备聚氨酯弹性体。比较了这2种扩链剂对PU弹性体力学性能的影响。实验结果表明:MOCA-PU的硬度、模量和强度均大于E-300-PU,E-300-PU的扯断伸长率略高于MOCA-PU。在相同硬度下的聚醚型PU弹性体,E-300-PU比MOCA-PU的撕裂强度高。 相似文献
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The polyamide 6-polyurethane copolymer (PA6-b-PU-b-PA6) was synthesized through anionic suspension polymerization and then mixed with polyamide 6/thermoplastic polyurethane (PA6/TPU) and polyamide 6, 6/thermoplastic polyurethane (PA66/TPU) blends using as the compatibilizer. The results show that the PA6-b-PU-b-PA6 copolymers powders several can be obtained through suspension polymerization using dimethicone as disperse medium. The average diameter of PA6-b-PU-b-PA6 copolymer powders decreased with the increasing of PU content. With the addition of PA6-b-PU-b-PA6, the TPU phase dispersed more uniformly in PA6 or PA66 matrix, and the size of TPU dispersed phase decreased obviously. The PA6-b-PU-b-PA6 copolymer with higher PU content shows better compatibilizing effect. Addition of PA6-b-PU-b-PA6 can improve both strength and toughness of the PA/TPU blends. When the amount of PA6-PU25% copolymer was 5 phr, the tensile strength and notched impact strength of PA6/TPU/PA6-PU25% blends increased 29 and 159.4%, respectively, compared to the PA6/TPU blend without compatibilizer. 相似文献
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The antimicrobial effect of ionic liquids (ILs) as comonomers in polyurethane surface coatings was investigated. Ionic liquid-containing coatings were prepared from a hydroxyl end-capped liquid oligoester and a triisocyanate crosslinker. Three different commercially available hydroxyl end-capped ionic liquids were covalently incorporated into the coatings in order to end up with antimicrobial polyurethane films. The ionic liquids used in this study were chosen because of their structural similarities to other antimicrobial quaternary ammonium compounds (QACs). Prepared films have been examined against both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli type bacteria, and showed strong antimicrobial activity. 相似文献
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A series of novel carbamate group-containing quaternary ammonium salts (QASs) have been synthesized, which were subsequently used as antimicrobial agent and incorporated into polyurethane coatings through crosslinking with terpene-based polyol and polyisocyanate. The chemical structures of QASs were characterized by FT-IR, 1H NMR, and 13C NMR. The effects of QASs on the properties of coatings were investigated. The results showed that the resulting coatings exhibited significant antimicrobial activity against both Staphylococcus aureus and Escherichia coli by introducing QASs into the polyurethane networks. Furthermore, with the increasing of QAS content, the antimicrobial activity and adhesion of the coatings were enhanced, while the pencil hardness, water resistance and thermal stability of the coatings were decreased. 相似文献
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以PEA/TDI-100/MOCA作为聚合体系,采用预聚物法合成聚氨酯弹性体,考察了空心微球填充份数与粒径、偶联剂种类与用量等对聚氨酯弹性体性能的影响。结果表明,加入未经改性空心微球的聚氨酯弹性体性能下降,经偶联剂改性空心微球填充聚氨酯能明显提高试样的硬度、撕裂强度力学性能,合成工艺对改性空心微球填充聚氨酯弹性体力学性能影响较大。 相似文献
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增强反应注射成型聚氨酯及其性能研究 总被引:4,自引:0,他引:4
以反应注射成型聚氨酯(RIM-PU)为基体树脂,研制了以玻纤增强剂的增强反应注射成型聚氨酯(RRIM-PU)材料。讨论了原材料及玻纤对RRIM-PU加工工艺及材料性能的影响。结果表明,以碳化二亚胺改性的异氰酸酯(CM-MDI)和低聚合异氰酸酯改性的异氰酸酯(PAPI)混合物与丙腈--苯乙烯接枝改性环氧乙烷封端的聚醚二元醇(APG)为主要原料,玻纤长度不大于1.5时,不仅RRIM加工工艺性好,而且R 相似文献
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