摘要
以微晶纤维素(MCC)为原料,制备纤维素海绵(Cell),并以其作为基体,通过物理共混的方法与聚乙二醇(PEG)PEG-6000进行复合,制备聚乙二醇/纤维素相变材料(PCMs),研究了PCMs的结构与相变储能性能。实验结果表明:PCMs中PEG的质量分数可以达到90.77%,且相变过程中不会发生液体泄漏的问题。FT-IR分析表明纤维素基体和PEG之间存在明显的氢键作用,无新化合物产生。XRD分析结果表明:与纯PEG-6000相比,纤维素基体的加入不会改变PEG的结晶形态,但会降低PEG的结晶度。DSC结果表明,PCMs的熔融焓(ΔHf)随着PCMs中PEG质量分数的增加而增大,ΔHf最高可达146.88 J/g(PCM5),但均小于纯的PEG(179.09 J/g);PCMs的结晶焓(ΔHc)随着PCMs中PEG质量分数的增加而降低,ΔHc的绝对值最高可达137.81 J/g。TG分析表明,当环境温度小于250℃时,PCMs的热稳定性较好。
The cellulose sponges（Cell） was prepared with the microcrystalline cellulose（MCC） as raw material. Based on the homemade cellulose sponges, polyethylene glycol/cellulose phase change materials（PCMs） were prepared by physical blending method with polyethylene glycol（PEG） PEG- 6000 as phase change material. The structure and phase transition properties of PCMs were studied. Experimental results showed that the mass fraction of PEG in PCMs could reach 90.77% without liquid leakage during phase change process. FT-IR results showed that there was obvious hydrogen bonding in cellulose sponges between cellulose substrates and PEG- 6000 and there was no new compound. XRD analysis results showed that, compared with pure PEG- 6000, the addition of cellulose substrates didn′t change the crystalline form of PEG, but decreased the crystallinity of PEG in PCMs. DSC analysis results showed that the melting enthalpy（Δ H f ） of PCMs increased with the increase of PEG mass fraction, the value of which could reach 146.88 J/g（PCM 5 ）, and was less than that of pure PEG（179.09 J/g）. But the crystallization enthalpy（Δ H c ） of PCMs reduced with the increase of PEG mass fraction, the absolute value of which could reach 137.81 J/g. At last, TG analysis showed that the prepared PCMs had good thermal stability below 250 ℃.
作者
刘洁
刘志明
LIU Jie;LIU Zhiming(College of Material Science and Engineering,Northeast Forestry University,Harbin 150040,China)
出处
《生物质化学工程》
CAS
北大核心
2018年第4期1-6,共6页
Biomass Chemical Engineering
基金
黑龙江省自然科学基金项目(C2015055)
林业公益性行业科研专项(201504602-5)
哈尔滨市科技创新人才资助项目(2014RFXXJ038)
关键词
纤维素海绵
储能材料
聚乙二醇
cellulose sponge
eneray storage materials
polyethylene glycol
