通过原位聚合法制备了以正十二烷醇(DA)为芯材,密胺树脂(MF)或聚乙二醇改性密胺树脂(PMF)为壁材的相变微胶囊DA@MF和DA@PMF,并将相变微胶囊添加到木粉/高密度聚乙烯复合材料(WF/HDPE)中,制备了具有相变蓄热能力的DA@MF-WF/HDPE和 DA@PMF-WF/HDPE复合材料.采用DSC、TG和红外热成像等方法对DA@MF、DA@PMF 和相变微胶囊-WF/HDPE的热性能进行了分析与表征.测试结果表明,DA@PMF的结晶和熔融热焓值分别提高了35.0 J/g和21.5 J/g,快速失重温度提高了19.9℃;蓄热能力测试表明,DA@PMF成功添加至WF/HDPE中,且在制备过程中损失较小;DA@PMF-WF/HDPE的相变温度(27.2、11.3℃)、相变潜热(31.6、20.3 J/g)和热稳定性(256.9℃,DA开始失重)等性能表明其具备成为相变蓄热材料的潜力.
The phase change microcapsulates containing dodecanol(DA) were fabricated using melamine-formaldehyde (MF) or polyethylene glycol 200 modified melamine-formaldehyde (PMF) resin as the shell by in situ polymerization.Wood flour/high-density polyethylene (WF/HDPE) composites filled with MF shelled microcapsules (DA@MF) or PMF shelled microcapsules (DA@PMF) were prepared,respectively.The synthesized DA@PMF and DA@PMF filled WF/HDPE composites (DA@MF-WF/HDPE,DA@PMF-WF/HDPE) were characterized by infrared thermal imaging,DSC and TG analysis.The results show that the cooling and melting enthalpy of DA@PMF is increased by 35 J/g and 21.5 J/g,respectively,and the rapid mass loss temperature is delayed to 19.9℃;The thermal properties of DA@PMF-WF/HDPE indicate that DA@PMF are successfully incorporated into the WF/HDPE composites and there is little damage during the preparation process;DA@PMF-WF/HDPE are potential thermal energy storage materials based on their appropriate phase change temperature (27.2,11.3℃),outstanding thermal enthalpy (31.6,20.3 J/g) and perfect thermal stability (rapid mass loss at 256.9℃).