摘要
针对加热卷烟中聚乳酸(PLA)材料降温效果不理想的问题,采用高相变焓的聚乙二醇(PEG)对PLA进行共混改性。通过熔融挤出制备了不同PEG分子量与含量的PLA/PEG相变材料,系统地研究了材料的相变行为、力学性能、亲水性能、降温效果以及相变前后的结构变化。结果表明,与纯PLA材料相比,PEG的引入使材料在40~70℃处的相变潜热增大,相变温度范围变宽。PLA/PEG材料的力学性能和亲水性受PEG质量分数的影响显著,但受PEG分子量影响不明显。随着PEG质量分数的增加,PLA/PEG材料的屈服强度和杨氏模量显著降低,断裂伸长率升高,亲水性提高。采用熔融沉积成型技术将PLA/PEG材料3D打印成降温滤嘴,并应用到加热卷烟中具有良好的降温效果,这归因于PEG的熔融吸热和PLA在玻璃化转变区域的热焓松弛。
Aiming at the problem of poor cooling effect of poly(lactic acid)(PLA)in the heat-not-burn cigarette,the PLA was modified by blending with poly(ethylene glycol)(PEG)that had high enthalpy of phase transformation.PLA/PEG phase change materials with different molecular weights and contents of PEG were prepared by melt extrusion.The phase change behaviors,mechanical properties,hydrophilicity,cooling effect and structural changes before and after phase changes for the materials were systematically investigated.The results show that compared with the pure PLA material,the incorporation of PEG enhances the latent heat of phase transition at 40-70℃and widens the temperature range of phase change of the materials.The mechanical properties and hydrophilicity of PLA/PEG material are significantly affected by the mass fraction of PEG,but almost not affected by the molecular weight of PEG.With the increase of the PEG mass fraction,the yield strength and Young's modulus of PLA/PEG material decrease,while the elongation at break and hydrophilicity increase.PLA/PEG material was 3D-printed into the cooling filter by the fusion deposition molding.When the PLA/PEG cooling filter is applied to the heat-not-burn cigarette,it shows a good cooling effect,which is attributed to the melting endotherm of PEG and the enthalpy relaxation of PLA in the glass transition region.
作者
徐建
王暄博
卢昕博
蒋健
郑映
潘鹏举
XU Jian;WANG Xuanbo;LU Xinbo;JIANG Jian;ZHENG Ying;PAN Pengju(Technology Center,China Tobacco Zhejiang Industrial Company Limited,Hangzhou 310024,China;State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2024年第8期115-122,共8页
China Plastics Industry
关键词
聚乳酸
聚乙二醇
共混改性
降温效果
Poly(lactic acid)
Poly(ethylene glycol)
Blending Modification
Cooling Effect
