文献类型：期刊文献

中文题名：α-烯烃磺酸钠细乳液聚合法制备聚苯乙烯包覆石蜡相变材料

英文题名：Preparation of Polystyrene Coating Paraffin Phase Change Materials Using Sodium α-Olefin Sulfonate Polymerizable Emulsifier via Miniemulsion Polymerization

作者：袁修君[1];李忠辉[1];高玮[1];马新胜[1];吴秋芳[1]

机构：[1]华东理工大学化工学院,超细粉末国家工程研究中心,上海200237

年份：2013

卷号：39

期号：3

起止页码：262

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

语种：中文

中文关键词：细乳液聚合;可聚合乳化剂;纳米胶囊;相变材料

外文关键词：miniemulsion polymerization; polymerizable emulsifier; nanoencapsulation; phase change material

摘要：以α-烯烃磺酸钠(AOS)为可聚合乳化剂,采用细乳液聚合法制备了以聚苯乙烯(PS)为壁材、石蜡为芯材的相变材料(PCM)粒子,考察了乳化剂、交联剂用量及链转移剂对粒子形貌的影响。AOS水溶液及细乳液的临界胶束质量浓度分别为0.59、6.0g/L,其乳化能力优于十二烷基苯磺酸钠。采用XRD、FT-IR、DLS、TEM、DSC、TG等手段,分别表征了相变材料粒子的形貌、结构、热学性质等。研究表明:PCM纳米胶囊粒子的表面由PS包覆而成,当乳化剂的质量分数为4.0%、交联剂质量分数为0.5%～1.0%时,PCM粒子具有明显的核-壳结构。DSC测试表明:当乳化剂质量分数为7%时,包覆率最高,胶囊材料的熔融曲线与纯石蜡的熔融曲线十分接近;PCM粒子的相变潜热为151.8J/g,DSC测试结果与TG的计算结果一致。
Nanoencapsulated phase change materials （PCM） with a polystyrene shell and a paraffin core were synthesized by the miniemulsion polymerization using sodium α-olefin sulfonate （AOS） as polymerizable emulsifier. Effect of the amount of polymerizable emulsifier, chain transfer agent, and crosstinking agent on the partiele morphology was investigated. The critical mieelle concentrations of aqueous solution and miniemulsion solution of AOS were 0. 59, 6. 0 g/L respectively as determined by conductivity. The emulsifying ability test showed that the emulsifying ability of AOS was better than that of sodium dodeeyl benzene sulfonate. The morphology, structure and thermal properties of nanoencapsulated PCM were characterized by XRD, FT IR, DLS, TEM, DSC and TG. The results suggested that paraffin was encapsulated by the shell of polystyrene and PCM particle showed a core-shell structure when the mass fractions of emulsifier and cross-linker were 4. 0% and 0. 5%---1. 0%, respectively. The encapsulation efficiency reached the maximum value the phase change temperature of the nanoencapsulated PCM was very close to that of paraffin when the mass fraction of emulsifier was 7 % as observed by DSC. The latent heat of PCM phase transition was 151. 8 J/g which was similar to that measured by TG.