PGA熔融改性PBAT共混物的制备与性能  

Preparation and Properties of PGA Reinforced PBAT Blends

作　　者：罗开举 丁枫 LUO Kai-ju;DING feng(Shanghai Pujing Chemical Technology Co.,Ltd.,Shanghai 201512,China)

机构地区：[1]上海浦景化工技术股份有限公司,上海201512

出　　处：《塑料科技》2024年第5期107-111,共5页Plastics Science and Technology

基　　金：国家重点研发计划“煤炭清洁高效利用和新型节能技术”(2018YFB0604703)。

摘　　要：为了探究聚乙醇酸(PGA)取代聚乳酸(PLA)在聚对苯二甲酸-己二酸丁二醇酯(PBAT)改性中的应用潜力,将PGA(质量分数0~25%)与PBAT进行双螺杆熔融共混,并分析共混物热学性能、力学性能、结晶性能、阻隔性能的变化规律。结果表明:PGA在共混体系中起成核剂和增强剂的作用,可以提高结晶温度、拉伸强度和弹性模量,降低结晶焓和热分解温度。PGA含量增加至25%,共混体系的维卡软化点达到89.4℃,热变形温度为41.6℃。共混体系的水蒸气/氧气的阻隔性能随着PGA含量的增加呈现出先降低后增加的趋势。然而,PGA含量增加至25%时,共混体系的断裂伸长率下降至221%。基于实验结论及相关文献资料,对比了25%PGA和25%PLA改性PBAT的性能。结果表明:25%PGA改性PBAT的力学性能和阻隔性能明显优于25%PLA改性的PBAT,M-25在0~90 d的工业堆肥降解率快于N-25,两者均符合工业堆肥降解标准。In order to explore the potential application of poly(glycolic acid)(PGA)instead of poly(lactic acid)(PLA)in the modification of poly(terephthalic acid-butylene adipate)(PBAT),PGA(mass fractions 0~25%)and PBAT were blended by twin-screw melt blending,and the changes of thermal properties,mechanical properties,crystallization properties and barrier properties of the blends were analyzed.The results show that PGA acts as nucleating agent and reinforcing agent in the blend system,which can increase the crystallization temperature,tensile strength and elastic modulus,and decrease the crystallization enthalpy and thermal decomposition temperature.When the content of PGA increases to 25%,the Vicat softening point of the blend system reaches 89.4℃and the hot deformation temperature reaches 41.6℃.With the increase of PGA content,the water vapor/oxygen barrier property of the blend system decreases at first and then increased.However,when the content of PGA increases to 25%,the elongation at break of the blend decreases to 221%.Based on the experimental results and related literature,the properties of 25%PGA and 25%PLA modified PBAT were compared.The results show that the mechanical properties and barrier properties of 25%PGA modified PBAT are significantly better than those of 25%PLA modified PBAT,and the degradation rate of M-25 is faster than that of N-25 in 0`90 days,both of which meets the degradation standard of industrial compost.

关 键 词：聚乙醇酸 聚对苯二甲酸-己二酸丁二醇酯 熔融共混 阻隔性能 生物降解性能 

分 类 号：TB332[一般工业技术—材料科学与工程]