摘要
以正十四烷和正十八烷为原料,制备了二元复合共晶相变材料(PCM),以其为芯材、Ba CO_(3)为壁材,采用自组装法和化学沉淀法制备了多功能相变微胶囊(MPCM)。采用FTIR、SEM、TGA、DSC对MPCM进行了表征。将MPCM掺加到水泥浆中制备了不同MPCM质量分数(以标准水泥的质量计,下同)的水泥试样,采用Micro-CT装置和XCOM计算代码对水泥试样屏蔽X射线的能力进行了评估。结果表明,MPCM同时具有储热和抗电离辐射能力;MPCM呈椭球状或球霰状,中值粒径为16.4μm,其核壳结构通过分子间作用力连接,有效保持了相变芯材的储热密度;MPCM的起始相变温度为1.22℃,潜热(熔融焓和结晶焓)分别为–122.18和81.98 J/g,包覆率为79.99%;经80次热循环实验后,MPCM相变温度保持稳定,平均潜热下降6.56 J/g。MPCM能明显增强水泥试样的辐射屏蔽效果,MPCM质量分数为10%时,制备的水泥试样MCP_(10)的线性衰减系数比未加入MPCM制备的水泥试样增加了42.2%。
Binary composite eutectic phase change material (PCM) was firstly prepared from n-tetradecane and n-octadecane.Multifunctional phase change microcapsules (MPCM) were then synthesized by self-assembly method and chemical precipitation method using PCM as core material and BaCO_(3) as wall material,characterized by FTIR,SEM,TGA,DSC,and added to cement slurry to further obtain cement samples with different MPCM content (based on the mass of standard cement,the same below),which were evaluated by Micro-CT device and XCOM calculation code for their X ray shielding ability.The results showed that MPCM exhibited the capacity of heat storage and ionizing radiation resistance,and presented in ovoid or spheroidal shape with a median particle size of 16.4μm.The core-shell structure effectively maintained the heat storage density of MPCM through the intermolecular force connection.MPCM showed an initial phase change temperature of 1.22℃,latent heat (enthalpy of melting and enthalpy of crystallization) of–122.18 and 81.98 J/g,respectively,and encapsulation rate of 79.99%.After 80 thermal cycles,the phase change temperature remained unchanged,and the average latent heat decreased by only 6.56 J/g.MPCM could significantly enhance the radiation shielding effect of cement samples.The linear attenuation coefficient of the cement sample MCP_(10 )prepared with 10% content MPCM was increased by 42.2% compared with that of the cement sample without MPCM.
作者
阙川林
刘天乐
杨国坤
孟征
雷刚
QUE Chuanlin;LIU Tianle;YANG Guokun;MENG Zheng;LEI Gang(Faculty of Engineering,China University of Geosciences,Wuhan 430034,Hubei,China;No.2 Construction Engineering Co.,Ltd.,China Construction Third Engineering Bureau,Wuhan 430034,Hubei,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2024年第12期2637-2644,共8页
Fine Chemicals
基金
国家自然科学基金项目(42072343)
中央高校基本科研业务费专项资金项目(107-G1323523046)。
关键词
相变材料
多功能化
储热节能
电离辐射屏蔽
功能材料
phase change materials
multifunction
thermal storage and energy saving
ionizing radiation shielding
functional materials
