微胶囊化相变材料具有储能密度高、相变恒温、便于储存或运输等特点，在热能储存、输运和利用等领域具有广阔的应用前景。针对传统相变微胶囊含有甲醛及低导热率等问题，以正十二烷醇为芯材、以丙烯酸树脂为壳材，在超声辐照条件下采用悬浮聚合的方法制备了相变微胶囊颗粒，并通过添加氧化石墨烯进行改性。采用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、差式扫描量热仪(DSC)、热重分析仪(TG-DTA)等对其进行测试表征。FT-IR测试结果表明氧化石墨烯的添加并未影响相变微胶囊的基本化学结构。结果表明，氧化石墨烯的引入使微胶囊颗粒粒径增大，且对其外观形貌产生较大影响。相变微胶囊的热性能和稳定性得到改善，相变潜热增加到135.6 kJ/kg，提升了45%，封装率提升到62%。

With the characteristics of high energy storage density, constant temperature in phase change process and convenient storage/transportation, the microencapsulated phase change material (MPCM) has a broad application prospect in the fields of thermal storage, transportation and utilization such as solar energy thermal utilization, waste heat recovery and utilization, refrigeration and air conditioning, and so on. However, the traditional MPCM particles use formaldehyde as the shell material, which releases harmful substances during application process. In addition, the MPCM application fields is restricted because of low thermal conductivity of polymer shell. Therefore, it is necessary to develop a new type of formaldehyde-free MPCM. In this work, the MPCM particles of n-dodecanol as core material and acrylic resin copolymers as shell were prepared employing the method of suspension polymerization under the condition of ultrasound exposure. Furthermore, in order to enhance the thermal performance of MPCM particles, the graphene oxide (GO) was introduced to modify the MPCM. Then the characteristics of MPCM and GO-MPCM were tested by scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), differential scanning calorimetry (DSC), thermal gravimetric analyzer (TG–DTA). The results showed that there was no effect on basic chemical organization of MPCM with introduce the graphene oxide nano-particles. However, under the same preparation conditions, the introduction of graphene oxide nano-particles increased the MPCM particles size and greatly affected their appearance and morphology. The thermal conductivity of MPCM particles was improved. The encapsulation rate increased to 62%, and the latent heat of phase change was 135.6 kJ/kg, which was 45% higher than that of unmodified phase change microcapsules. The study results in this work can provide data support for the preparation and performance improvement of MPCM particles, and also provide theoretical basis for its engineering application.