聚甲基丙烯酸十八烷基酯/长链脂肪醇共混物的热性能
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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 C18 OH /PSMA and C26 OH / 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.
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 C18 OH /PSMA and C26 OH / 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.
引文
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[4]SHI J N,GER M D,LIU Y M,et al.Improving the thermal conductivity and shape-stabilization of phase change materials using nanographite additives[J].Carbon,2013,51:365-372.
[5]PIELICHOWSKI K,FLEJTUCHK.Recent developments in polymeric phase change materials for energy storage:poly(ethylene oxide)/stearic acid blends[J].Polymers for Advanced Technologies,2005,16(2-3):127-132.
[6]SARI A,KARAIPEKLI A.Preparation and thermal properties of capric acid/palmitic acid eutectic mixture as a phase change energy storage material[J].Materials Letters,2008,62(6/7):903-906.
[7]INOMATA K,SAKAMAKI Y,NOSET,et al.Solidstate structure of comb-like polymers having n-octadecyl side chain:Ⅱ:crystalline-amorphous layered structure[J].Polymer Journal,1996(28):992-999.
[8]INOMATA K,SAKAMAKI Y,NOSE T,et al.Solidstate structure of comb-like polymers having n-octadecyl side chain:Ⅰ:crystalline-amorphous layered structure[J].Polymer journal,1996(28):986-991.
[9]LEE C H,CHOI H K.Crystalline morphology in highdensity polyethylene/paraffin blend for thermal energy storage[J].Polymer Composites,1998,19:704-708.
[10]SHI H F,ZHANG L J,LIW W,et al.Structure and properties of mixtures based on long chain polyacrylate and 1-alcohol composites[J].Materials Chemistry and Physics,2014,143(3):1069-1074.
[11]SHI H F,WANG H X,YIN Y P,et al.Chain packing and phase transition of n-hexacosylated polyethyleneimine comb-like polymer:a combined investigation by synchrotron X-ray scattering and FTIR spectroscopy[J].Polymer,2013,54(22):6261-6266.
[12]SHI H F,WANG H X,XIN J H,et al.Nanoconfinement crystallization of frustrated alkyl group:crossover of mesophase to crystalline structure[J].Chemical Communication,2011,47:3825-3827.
[13]RUBIN I D,PUGLIESE R D.A study of poly(noctadecyl methacrylate)with n-dodecane and noctadecane[J].Die Angewandte Makromolekulare Chemie,1989,171:165-173.
[14]KIM M S,LEVON K.Blend of alkylated comb-like polyacrylates with copolymers with a controlled ethylenevinyl acetate composition[J].Polymer Science:Polymer Physics,1996,34:1665-1677.
[15]KIM M S,LEVON K.Blend of electroactive poly(3-dodecylthiophene)with comb-like alkylated polyacrylate[J].Polymer Physics,1997,35:1025-1041.