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聚甲基丙烯酸十八烷基酯/长链脂肪醇共混物的热性能

Thermal performance of poly( stearyl methacrylate) and long-chain fatty alcohol composites
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摘要 以物理共混法制备了质量比为60∶40的不同碳链长度脂肪醇和聚甲基丙烯酸十八烷基酯共混物(CnOH/PSMA(60/40)),并利用傅里叶变换红外光谱(FT-IR)、差示扫描量热仪(DSC)、X射线衍射(XRD)、热重分析(TG)和偏光显微镜(POM)等方法对CnOH/PSMA(60/40)共混物的结构、热性能、相转变及结晶行为进行研究。结果表明:对于CnOH/PSMA(60/40)共混物,当n为14、16时共混物出现黑十字消光球晶,尺寸大约在250μm左右;当n为18、26时没有观察到球晶形态。CnOH/PSMA(60/40)共混物的热焓和热稳定性随脂肪醇侧链长度的增加而逐渐增加,并呈现出复杂化的趋势。从结晶成核和侧链结晶角度对共混物的结晶形态进行了探讨,同时分析了共混物作为热能储存材料使用的可能性。 A series of composites based on different side-chain length fatty alcohol (CnOH, n = 14,16, 18,26) and poly(stearyl methacrylate) (PSMA) with weight ratio of 60:40 are prepared by physical mixing method. The structures, thermal performances, phase change behaviors and crystallization behaviors of composites are investigated by Fourier transform infrared spectroscopy (FT-IR) , differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), thermogravimetric analysis (TGA) and polarized optical microscopy (POM). The C14 OH/PSMA and C16 OH/PSMA composites exhibit maltese cross of polymer spherulite, and its size is approximately ca. 250 μm. However, for C18OH/ PSMA and C26OH/PSMA composites, no polymer spherulite morphology is founded. The heat enthalpy and thermal stabilities of CnOH/PSMA composites increases with the side-chain length of CnOH, and it shows the complicated variation behavior. The crystal morphology is deeply discussed from the aspect of crystal nucleation and side-chain crystallization behavior, and the end-use possibility of thermal energy storage is also clarified.
出处 《纺织学报》 EI CAS CSCD 北大核心 2015年第2期7-12,共6页 Journal of Textile Research
基金 国家自然科学基金项目(21404080) 教育部新世纪优秀人才支持计划项目(NECT-13-0928) 天津市自然科学重点基金项目(12JCZDJC26800) 北京分子科学国家实验室基金项目(BNLMS-2013016)
关键词 脂肪醇 聚甲基丙烯酸十八烷基酯 储能材料 球晶 fatty alcohol poly( stearyl methacrylate) energy-saving material spherulite
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