文章摘要
乙二胺化氧化石墨烯改性超支化聚氨酯-含丙烯酸酯复合乳液的制备与表征
Preparation of Poly(Ethylenediamined Graphene Oxide/Acrylate)-Waterborne Hyperbranched Polyurethane Hybrid Latexes
  
DOI:10.16865/j.cnki.1000-7555.2017.09.020
中文关键词: 乙二胺  氧化石墨烯  超支化聚氨酯  丙烯酸酯
英文关键词: ethylenediamine  graphene oxide  hyperbranched polyurethane  acrylate
基金项目:国家自然科学基金资助项目(51173001);安徽高校自然科学研究重点项目(KJ2016A792);安徽省自然科学基金资助项目(11040606M59)
作者单位
闰彦玲,杨建军,吴庆云,张建安,吴明元 安徽大学化学化工学院安徽省绿色高分子材料重点实验室,安徽 合肥 230601 
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中文摘要:
      采用乙二胺与丙烯酸丁酯依次对氧化石墨烯(GO)进行改性引入乙烯基(MGO),然后与丙烯酸酯类(含羟基)单体聚合获得含-OH的MGO/PA;同时在超支化聚氨酯核外围接枝线性聚氨酯获得含-NCO 的超支化聚氨酯预聚体,两者混合后缩聚并交联,经乳化获得乙二胺化GO 改性超支化聚氨酯-含丙烯酸酯复合乳液。通过红外光谱、X射线衍射、X射线光电子能谱、透射电镜、原子力显微镜、扫描电镜、热重分析等对材料进行表征,并探讨了不同含量MGO 对乳液力学稳定性、胶膜耐水性、热性能以及力学性能的影响。结果表明,乙二胺对GO 改性成功,剥离更完全且分散性很好。当引入聚丙烯酸酯(PA)固定含量为16%,随着MGO 含量的增加,胶膜的水接触角、拉伸强度、吸水率均呈现先增加后降低的趋势,当MGO 质量分数为0.46%时,与HBPU 基体有较好的相容性,复合材料的综合性能最佳,其热分解温度提高了29℃,胶膜表面水接触角为99.7°,24h吸水率为5.21%,拉伸强度为15.37MPa,断裂伸长率为445.3%。
英文摘要:
      Graphene oxide(GO) was firstly synthesized, and modified with ethylenediamine and butyl acrylate step by step. Then the obtained MGO which has introduced vinyl groups reacted with acrylate monomers (including hydroxy) by polymerization to prepare MGO/PA containing hydroxy groups; meanwhile, the hyperbranched polyurethane(HBPU) prepared was used as core, of which periphery grafted with linear polyurethane, which contained cyanate groups, and the MGO/PA was finally added into the system, via polycondensation and crosslinking, under the action of homogeneous emulsification, finally the waterborne hyperbranched polyurethane containing poly(ethylenediamined GO/acrylate) hybrid latexes were acquired. The FT-IR, XRD, TEM, AFM, FE-SEM, TG and so on were used to characterize the composites, and the effects on the stability, hydrophobicity, thermal performance and mechanical property of hybrid latexes with different content of MGO were investigated. The results demonstrate that GO is successfully ethylenediamined, exfoliated relatively completely and uniformly dispersed. When the content of MGO is increasing, the water contact angle, tensile strength and water absorption of the composite films will rise at first and go down at last, and during this process the addition of PA is fixed (about 16% relative to HBPU).The introduction of MGO is about 0.46%, revealing a commendable compatibility with HBPU matrix, and comprehensive performance of the composites reaches the best: the thermal decomposition temperature of composite films increases by 29 ℃, the 24 h water absorption of films respectively reaches to 5.21% and the water contact angle of film surface is 99.7°, meanwhile the tensile strength and elongation of composites respectively are 15.37 MPa and 445.3%, respectively.
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