相变储湿纤维的制备及其形貌影响因素的研究

醋酸纤维素为包裹材料、聚乙二醇800为相变材料、N,N-二甲基乙酰胺和丙酮为溶剂,采用静电纺丝法制备具有调温调湿性能的相变储湿纤维。采用电子扫描电镜(SEM)对相变储湿纤维进行表征,系统分析相变材料用量、聚合物用量、溶剂性质、电压和推速对表面形貌的影响;采用傅里叶变换红外光谱仪(FT-IR)、动态水分吸附分析仪(DVS)和差示扫描量热仪(DSC)研究优化工艺参数下制备的相变储湿纤维的组成结构、储湿调湿性能和相变调温性能。相变储湿纤维的优化工艺参数,即聚乙二醇800与丙酮的质量比为0.15、醋酸纤维素与丙酮的质量比为0.13、N,N-二甲基乙酰胺与丙酮的质量比为0.20、电压为20.0 kV、推速为0.40 mL/h。结果表明,优化工艺参数下制备的相变储湿纤维在相对湿度为40%~60%时,平衡含湿量为0.0412~0.2239 g/g;在相变温度为21.53~29.25℃时,相变潜热为44.64~49.45 J/g。

PHASE CHANGE AND HUMIDITY STORAGE FIBERS AND INFLUENCE FACTORS OF MORPHOLOGY

A kind of phase change and humidity storage fibers with temperature-humidity controlling performance was prepared by electro spinning method-cellulose acetate as coating materials,polyethylene glycol 800 as phase change materials, N,N-dimethylacetamide and acetone as solvent. The phase change and humidity storage fibers were characterized bys canning electron microscope(SEM). Effects of phase change material content,polymer content,solvent properties,voltage and driving speed on the morphology of phase change and humidity storage fibers weresy stematically studied. Composition structure,phase change and temperature controlling property,humidity storage and humidity controlling property of the prepared phase change and humidity storage fibers with optimized process parameters were characterized by Fourier Transform Infrared Spectroscopy(FT-IR),Dynamic Vapor Sorption(DVS)and Differential Scanning Calorimetry(DSC). Eventually,Optimized processing parameters of the phase change and humidity storage fibers showed that mass ratio of polyethylene glycol 800 to acetone is 0.15,mass ratio of cellulose acetate to acetone is 0.13,mass ratio of N,N-dimethylacetamide to acetone is 0.20,voltage is 20.0 kV and driving speed is 0.40 mL/h. The under optimized process parameters prepared phase change and humidity storage fibers’ equilibrium moisture content is 0.0412-0.1990 g/g in 40%RH-60%RH,and its phase change latent heat is 44.64~49.45 J/g at phase change temperature 21.53-29.25 ℃.