PDA改性纤维素基复合相变材料的制备及性能  

Preparation and properties of PDA-modified cellulose-based composite phase change materials

作　　者：杨文菊 唐雨霞 陈卫麒 汪华[2] 王浩[1] YANG Wenju;TANG Yuxia;CHEN Weiqi;WANG Hua;WANG Hao(School of Materials and Chemistry,Anhui Agricultural University,Hefei 230036,Anhui,China;Anhui Province Product Quality Supervision and Inspection Institute,Hefei 230051,Anhui,China)

机构地区：[1]安徽农业大学材料与化学学院,安徽合肥230036 [2]安徽省产品质量监督检验研究院,安徽合肥230051

出　　处：《精细化工》2024年第11期2405-2412,2422,共9页Fine Chemicals

基　　金：安徽省科技重大专项项目(202103a06020005);科技部“科技助力经济2020”重点专项项目(国科发资[2020]151号)。

摘　　要：将多巴胺(DA)在有(无)2,2,6,6-四甲基哌啶-氮-氧化物存在下自聚合形成聚多巴胺(PDA)纳米粒子〔记为T-PDA(A-PDA)〕;然后,分别与羧甲基纤维素钠(CMC)混合,以4-羟基-3-甲氧基苯甲醛为交联剂制备了CT-P和CA-P气凝胶;最后,将CMC气凝胶(CMC以4-羟基-3-甲氧基苯甲醛为交联剂制备)、CA-P和CT-P气凝胶真空浸渍聚乙二醇2000(PEG2000)制备了3种复合相变材料PEG/CMC、PEG/CA-P和PEG/CT-P。采用SEM、FTIR、DSC、TGA和热像仪对气凝胶、复合相变材料进行了表征。结果表明,PDA粒子的加入提高了复合相变材料的综合性能,CA-P和CT-P气凝胶孔隙率分别为94.73%和92.80%,高于CMC气凝胶(92.30%);3种气凝胶对PEG2000均有良好的封装稳定性,在100℃保持30 min,其封装的PEG2000虽融化但未发现明显的泄漏;PEG/CA-P和PEG/CT-P的光热转化效率分别为51.75%和76.27%,高于PEG/CMC(41.86%)。与PEG/CMC和PEG/CA-P相比,PEG/CT-P的相变焓值(149.26 J/g)更接近PEG2000(152.67 J/g),表现出了更佳的储能效果。制备的3种复合相变材料在50次的DSC热循环性考察中均表现出优异的循环稳定性。Polydopamine(PDA)nanoparticles[noted as T-PDA(A-PDA)]were prepared by self-polymerization of dopamine(DA)in the presence or absence of 2,2,6,6-tetramethylpiperidinyloxy,then mixed with sodium carboxymethyl cellulose(CMC),respectively,using 4-hydroxy-3-methoxybenzaldehyde as crosslinking agent to obtain CT-P and CA-P aerogels.Finally,three types of composite phase change materials,PEG/CMC,PEG/CA-P and PEG/CT-P,were synthesized from vacuum impregnation of polyethylene glycol 2000(PEG2000)with CMC aerogel(CMC using 4-hydroxy-3-methoxybenzaldehyde as crosslinking agent),CA-P and CT-P aerogels.The aerogels and composite phase change materials were characterized by SEM,FTIR,DSC,TGA and thermal imaging.The results showed that the addition of PDA nanoparticles improved the comprehensive properties of composite phase change materials.CA-P and CT-P aerogels displayed porosity of 94.73%and 92.80%,respectively,higher than CMC aerogel(92.30%).The three aerogels exhibted good encapsulation stability for PEG2000,with PEG2000 melted but no observed leakage when stored at 100℃for 30 min.The photothermal conversion efficiency of PEG/CA-P and PEG/CT-P were 51.75%and 76.27%,respectively,higher than that of PEG/CMC(41.86%).Compared with PEG/CMC and PEG/CA-P,PEG/CT-P showed similar phase transition enthalpy(149.26 J/g)to PEG2000(152.67 J/g),indicating better energy storage effect.These three composite phase change materials showed excellent cyclic stability during 50 DSC thermal cycling tests.

关 键 词：聚多巴胺 羧甲基纤维素钠 气凝胶 复合相变材料 热性能 功能材料 

分 类 号：TB34[一般工业技术—材料科学与工程]