Paraffin, as an excellent phase change material (PCM), is limited by the leakage problem and low thermal conductivity. In this research, a novel paraffin/neopentyl glycol dimethacrylate/boron nitride (paraffin/NPGDMA/BN) composite PCM was successfully prepared via a physical mixing process. NPGDMA in paraffin/NPGDMA/BN composite PCM was cured by UV light under the action of photo initiator, which can improve the shape stability to avoid the leakage of paraffin in the process of phase change. By comparing the leakage rate, latent heat, and thermal conductivity, the optimal mass ratio of paraffin and NPGDMA was selected to be 7 : 3. It was showed that the presence of 5 wt% BN led to increasing in thermal conductivity by up to 59%. The microstructure of the composite PCMs was characterized by SEM, FTIR, and XRD. The composite PCMs can be processed into a variety of shapes by using molds. The paraffin/NPGDMA/BN composite PCM exhibited a significantly improved shape stability and large phase change enthalpy of 123.0 J/g. The leakage rate of paraffin/NPGDMA/BN was much improved after being soaked with petroleum ether.

中文翻译：

---

用于相变储能的形状稳定的石蜡/ NPGDMA / BN复合材料的制备和热性能

石蜡作为一种出色的相变材料（PCM），受到泄漏问题和低导热性的限制。在这项研究中，通过物理混合工艺成功制备了新型石蜡/新戊二醇二甲基丙烯酸酯/氮化硼（石蜡/ NPGDMA / BN）复合PCM。在光引发剂的作用下，用紫外光固化石蜡/ NPGDMA / BN复合PCM中的NPGDMA，可以提高形状稳定性，避免石蜡在相变过程中泄漏。通过比较泄漏率，潜热和热导率，选择石蜡和NPGDMA的最佳质量比为7：3。结果表明，存在5 wt％的BN会使热导率增加多达59％ ％。通过SEM，FTIR和XRD对复合材料PCM的微观结构进行了表征。可以通过使用模具将复合PCM加工成各种形状。石蜡/ NPGDMA / BN复合PCM表现出显着改善的形状稳定性和123.0 J / g的大相变焓。用石油醚浸泡后，石蜡/ NPGDMA / BN的泄漏率大大提高。