摘要
以甲酰胺(FA)为改性剂,采用熔融共混法对三水醋酸钠(SAT)进行改性得到新型SAT/FA复合相变材料(CPCM)。探讨FA质量分数(下同)对SAT/FA共混物(基体)相变焓及相变温度的影响。利用熔融-固化循环及步冷曲线,系统探讨成核剂、增稠剂对复合材料相分离、过冷度及放热性能的影响。对新型SAT/FA CPCM的结构及性能进行XRD、FTIR及DSC表征。结果显示:添加25%的FA于SAT中可形成SAT/FA低共融体;添加2%十二水磷酸氢二钠成核剂和2%聚乙烯醇增稠剂形成的CPCM,过冷度低(2.67℃),放热时间长(10170 s),循环稳定性好,相变焓高达233.9 k J·kg-1,相变温度40.88℃。可应用于相变蓄热地板辐射采暖。
Formamide（FA） as modifier, a novel sodium acetate trihydrate（SAT）/formamide（FM） composite phase change material（CPCM） was prepared by melt blending method. The influence of the formamide mass fraction（the same as below） on the phase change enthalpy and the temperature of SAT/FA mixture（matrix） was discussed. The effects of nucleating agent and thickening agent on the phase separation, the degree of supercooling and the release time of composite material were systematically investigated by melting-solidification cycle and step cooling curve. The structure and performance of novel CPCM were characterized by FTIR, XRD and DSC. The results showed that the SAT/FA eutectic mixture formed by adding 25% formamide into SAT. The SAT/FA CPCM formed by adding 2% disodium hydrogen phosphate dodecahydrate（DSP） as the nuclear agent and 2% polyvinyl alcohol（PVA） as thickening agent, had a low degree of supercooling（2.67℃）, long heat release time（10170 s） and excellent cycling stability. Its phase change enthalpy and temperature were 233.9 k J·kg-1 and 40.88℃, respectively, indicating that it can be applied to floor radiant heating with phase change thermal storage.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第12期5142-5148,共7页
CIESC Journal
基金
国家自然科学基金项目(21276089
21471059)~~
关键词
三水醋酸钠/甲酰胺复合相变材料
低共融体
相变焓
过冷度
循环稳定性
sodium acetate trihydrate/formamide composite phase change material
eutectic
phase change enthalpy
surpercooling degree
cycling stability
