采用悬浮聚合法制备了以氧化石墨烯改性甲基丙烯酸甲酯-丙烯酸共聚物为壁材,固体石蜡为芯材的相变储热微胶囊。采用光学显微镜(OM)、扫描电子显微镜(SEM)、红外光谱仪(FT-IR)、差示扫描量热仪(DSC)和热重分析仪(TGA)等手段对微胶囊的表面形貌、化学结构及热性能等进行了表征和测试。结果表明:当芯壁比为4∶10,氧化石墨烯含量为0.6%(质量分数)时,氧化石墨烯在壁材中分布均匀,微胶囊的平均产率为87.41%,平均包覆率为71.06%。微胶囊呈规则球形,平均粒径为200μm,相变焓为73.5J/g。经改性后,微胶囊热性能增加,机械强度提高。
Phase change microcapsules were synthesized by suspension polymerization with methyl methacrylate-acrylic acid copolymer modified by graphene oxide(GO) as wall material and solid paraffin as core material.OM,SEM,FT-IR,DSC and TGA were used to discuss morphology,chemical structure and thermal properties of microcapsule.The results showed that when the core/walll was 4∶10 and graphene oxide content reached 0.6wt%,graphene oxide was distributed evenly in the wall.The average yield of microcapsules was 87.41%.The cladding rate was 71.06%.The microcapsules were sphere and the average size was about 200μm.The phase transition enthalpy of microcapsules was 73.5J/g.The thermal property and mechanical strength of them were improved.
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基金资助
咸阳市科技局项目(2015k02-18);陕西科技大学科研启动项目(BJ12-06);陕西省科技计划项目(2017GY-185)
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