Preparation and Property of Poly(lactic acid)/Poly(caprolactone) Phase-Changed Cooling Materials
XU Jian1, LU Xinbo1, JIANG Jian1, WANG Xuanbo2,3, XIANG Wangkai2,3, ZHENG Ying2,3, PAN Pengju2,3
1. Technology Center, China Tobacco Zhejiang Industrial Company Limited, Hangzhou 310024, China;
2. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China;
3. Institute of Zhejiang University-Quzhou, Quzhou 324000, China
Abstract：Poly(lactic acid) (PLA)/poly(caprolactone) (PCL) blends were prepared by melt blending. The PLA/PCL phase-changed cooling materials were prepared by means of the melting endotherm of PCL and the glass transition endotherm of PLA in the blends. Effects of physical aging and blending ratio on the phase change behavior, phase structure, crystalline structure and mechanical property of the blends were investigated by differential scanning calorimeter, polarizing microscope, wide-angle/small-angle X-ray scattering and uniaxial tensile test. PLA/PCL phase-changed cooling materials were also 3D printed by a fused deposition modeling. These results showed that both physical aging and the addition of PCL increased the phase change enthalpy and broaden phase change temperature region of the blends, when compared to those of pure PLA. The improved phase change enthalpy of the blends after physical aging was originated from the crystalline perfection and lamellar thickening of PCL, and the formation of local ordered structure of PLA. PCL and PLA were incompatible in the blends, and the PCL phase was dispersed in the PLA matrix, showing a sea-island distribution structure. After adding PCL, the yield strength and Young's modulus of the blends decreased, and their elongation at break were almost unchanged. The 3D printing extrusion was smooth and the obtained 3D printing parts had good appearance, when the PLA/PCL phase-changed cooling materials were printed by a fused deposition modeling.
XU Jian,LU Xinbo,JIANG Jian et al. Preparation and Property of Poly(lactic acid)/Poly(caprolactone) Phase-Changed Cooling Materials[J]. Chemical Reaction Engineering and Technology, 2023, 39(4): 334-342.
