以石蜡(PA)为相变基体,烯烃嵌段共聚物(OBC)为支撑材料,氮化硼(BN)为添加剂,采用熔融法制备一种柔性相变材料PA-OBC/BN。经过傅里叶红外光谱仪(FT-IR)分析,PA-OBC/BN共熔混合物之间没有发生化学反应。所制备相变材料的导热系数随BN含量的增加而增加,当BN含量为10%时,导热系数为0.38W/(m·K),是不含BN材料的1.58倍,但材料的潜热值却随BN含量的增加而降低。研究发现,当最高循环温度为60℃时,在300次循环吸放热的过程中,相变材料的导热系数基本不变。但当最高循环温度升高到65℃甚至70℃时,含有BN的相变材料导热系数随循环次数的增加而降低,且BN含量越高降低幅度越大。另外,随着BN含量的增大,材料的硬度和韧性均会降低。
In this paper,a flexible phase change material (PA-OBC/BN) was prepared by melting method using paraffin (PA) as phase change matrix,olefin block copolymer (OBC) as support material and boron nitrite (BN) as additive.FT-IR analysis was carried out and found that there was no chemical reaction among PA,OBC and BN in the melting process.The thermal conductivity of the prepared phase change materials increased with the increase of BN content.When BN content was 10%,the thermal conductivity was 0.38W/(m·K),which was 1.58 times that of the material without BN.However,the latent heat value decreased with the increase of BN content.When the maximum cycling temperature was 60℃,the thermal conductivity of PA-OBC/BN was basically unchanged in the process of heat absorption and release for 300 cycles.However,when the temperature was raised to 65℃ or even 70℃,the thermal conductivity of phase change materials with BN decreased significantly with the increase of cycles.In addition,with the increase of BN content,the hardness and toughness of the material decreased.
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基金资助
国家自然科学基金(52006202);河南省研究生教育创新培养基地项目(YJS2021JD05);河南省重点研发与推广专项项目(222102320300、222102210033);郑州轻工业大学博士科研基金(0310-13501050023)
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