氧化石墨烯增强聚苯乙烯/硬脂酸丁脂微胶囊相变材料的研究∗

摘要

Modified graphene oxide (MGO)was obtained by using graphene oxide (GO)modified with theγ-methyl-propylene (KH-570).Microcapsule phase change materials of polystyrene/butyl stearate (MGO-Mi-croPCMs),reinforced by graphene oxide,was prepared by the seeded micro-suspension polymerization using the MGO and styrene monomer composites as wall material,n-Butyl stearate as core material.The chemical compositions,microstructure,thermal stability and mechanical properties of MGO-MicroPCMs were character-ized by Fourier transform infrared spectroscopy (FT-IR),X-ray photoelectron spectroscopy (XPS),scanning e-lectron microscopy (SEM),contact angle tester,particle size analyzer,differential scanning calorimeter (DSC),thermogravimetric analyzer (TG)and nano-indenter.The results showed that MGO-MicroPCMs was a spherical structure with uniform distribution.With the increase of MGO content,the average particle diameter of the microcapsules was reduced,the sealing property of microcapsules increased,permeability decreased 32.17% when the content of MGO was 0.6wt%,the hardness increased from 5.83 to 11.79 MPa,the thermal stability and hydrophilicity were also improved obviously.%采用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对氧化石墨烯(GO)进行功能化改性,得到改性氧化石墨烯(MG O ),以MG O 和苯乙烯单体的复合体系为囊壁,硬脂酸丁酯为芯材,通过种子微悬浮聚合法制备氧化石墨烯增强聚苯乙烯/硬脂酸丁酯微胶囊相变材料(MGO-MicroPCMs).利用红外光谱(IR)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、接触角测试仪、粒度分析仪、差示扫描量热仪(DSC)、热重分析仪(TG)和纳米压痕仪等表征了MGO-MicroPCMs的化学组成、微观结构、热性能和力学性能.结果表明,MGO-MicroPCMs 为粒径分布均匀的球形结构,随着MG O 含量增加,平均粒径减小,分布变窄,密封性逐渐提高,当添加0．6％(质量分数)MGO 时微胶囊渗透性降低了32．17％,微胶囊的硬度从5．83 MPa增大到11．79 MPa,同时热稳定性和亲水性也明显改善.