环氧大豆油对聚乳酸/酸化木质素性能的影响  

Effect of epoxy soybean oil on properties of poly(lactic acid)/acidified lignin

作　　者：林明华 王华 郭建兵 郑斌 王瑶 LIN Minghua;WANG Hua;GUO Jianbing;ZHENG Bin;WANG Yao(Kangmingyuan(Guizhou)Technology Development Co.,Ltd.,Anshun 561100,China;Guizhou Institute of Materials Industry Technology,Guiyang 550014,China)

机构地区：[1]康命源(贵州)科技发展有限公司,贵州安顺561100 [2]贵州省材料产业技术研究院,贵阳550014

出　　处：《工程塑料应用》2024年第10期159-164,共6页Engineering Plastics Application

基　　金：国家自然科学基金项目(52263007);贵州省科技计划项目(黔科合平台人才-ZZSG[2024]015,黔科合中引地项目[2024]020)。

摘　　要：为了探索环氧大豆油(ESO)对聚乳酸(PLA)/酸化木质素(AL)复合材料增容效果的影响,采用共混改性方法制备了PLA/AL/ESO三元复合材料,通过扫描电子显微镜对复合材料微观形貌进行了表征,研究了ESO含量对复合材料力学性能、结晶行为、流变特性及热稳定性的影响。研究发现,ESO的引入显著改善了PLA/AL复合材料的冲击断面形貌,使其从光滑平整转变为模糊粗糙,从而显著提升了材料的韧性。此外,ESO的加入降低了复合材料的初始热降解温度和最大热降解温度。同时,ESO降低了复合材料的熔融温度,而结晶度随ESO含量的增加呈现出先降低后升高的趋势。流变学分析结果显示,适量ESO的加入增强了聚合物分子链的运动能力,从而降低了复合材料的黏度。然而,过量ESO会导致分子链过度缠结,限制了PLA分子链的运动。研究表明,ESO作为一种有效的增塑剂和相容剂,能够显著优化PLA/AL复合材料的微观界面,提升断裂伸长率和冲击强度。但ESO的加入在一定程度上降低了材料的热稳定性、拉伸强度和弯曲强度。In order to explore the effect of epoxidized soybean oil(ESO)on the compatibilization effect of polylactic acid(PLA)/acidified lignin(AL)composites,PLA/AL/ESO ternary composites were prepared by blending modification method.The microstructure of the composites was characterized by scanning electron microscopy.The effects of ESO content on the mechanical properties,crystallization behavior,rheological properties and thermal stability of the composites were studied.It is found that the introduction of ESO significantly improves the impact fracture morphology of PLA/AL composites,which changes from smooth and flat to fuzzy rough,thus significantly improving the toughness of the material.In addition,the addition of ESO reduces the initial thermal degradation temperature and the maximum thermal degradation temperature of the composites.At the same time,ESO reduces the melting temperature of the composites,and the crystallinity decreases first and then increases with the increase of ESO content.Rheological analysis show that the addition of an appropriate amount of ESO enhances the mobility of the polymer molecular chain,thereby reducing the viscosity of the composite.However,excessive ESO can lead to excessive entanglement of molecular chains,which limits the movement of PLA molecular chains.Studies have shown that ESO,as an effective plasticizer and compatibilizer,can significantly optimize the micro-interface of PLA/AL composites and improve the elongation at break and impact strength.However,the addition of ESO reduces the thermal stability,tensile strength and flexural strength of the material.

关 键 词：聚乳酸 环氧大豆油 酸化木质素 热稳定性 力学性能 

分 类 号：TQ322.4[化学工程—合成树脂塑料工业]