PLA/PBAT/CB防静电包装材料的制备及其性能研究  

Preparation and properties of PLA/PBAT/CB antistatic packaging materials

作　　者：何和智 黄宗海 赖文 熊华威 HE Hezhi;HUANG Zonghai;LAI Wen;XIONG Huawei(Guangdong Key Laboratory of Advanced Polymer Manufacturing Technology and Equipment,Key Laboratory of Polymer Molding and Processing Engineering of Ministry of Education,School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510000,China)

机构地区：[1]华南理工大学机械与汽车工程学院,聚合物成型加工工程教育部重点实验室,广东省高分子先进制造技术及装备重点实验室,广州510000

出　　处：《中国塑料》2024年第7期1-8,共8页China Plastics

基　　金：国家自然科学基金(52373035)。

摘　　要：通过熔融共混法制备了聚乳酸(PLA)和聚己二酸/对苯二甲酸丁二酯(PBAT)的共混物,并添加了不同含量的炭黑(CB)。研究了CB对PLA/PBAT复合材料的微观形貌、流变性能、结晶性能、热稳定性、导电性能和力学性能的影响。结果表明,CB选择性地分布在PBAT相中,且当CB含量高于2%(质量分数,下同)时,相形态发生了明显的变化。复合材料的黏度随着CB含量的增加而增加。随着CB含量的不断增加,PLA的结晶度先下降再上升。CB能小幅度改善复合材料的热稳定性。适量的CB可以提高复合材料的电导率,并保持良好的力学性能,但过量的CB会大幅度地降低韧性。当CB含量为2%时,复合材料的拉伸强度、弹性模量和断裂伸长率分别为40.7 MPa、830 MPa和365%,电导率为8.69×10^(-7)S/m,比PLA/PBAT的电导率提升了约8个数量级,该复合材料既具有合适的导电性能,又具有优良的力学性能。提供了一种制备具有导电性能的生物基聚合物复合材料的方法,这将有助于可降解材料在防静电包装领域的实际应用。PLA/PBAT and PLA/PBAT/carbon black(CB)blends with different CB contents were prepared through melt blending.The effects of CB on the morphology,rheological behavior,crystallization properties,thermal stability,electrical conductance,and mechanical properties of the blends were investigated.Scanning electron microscopy observation indicated that CB was selectively dispersed in the PBAT phase as a result of a thermodynamics theory.Furthermore,a change in phase morphology could be clearly observed in the presence of 2 wt%CB.The rheological test results indicated that the viscosity of the PLA/PBAT/CB blends increased with an increase in the CB content.Differential scanning calorimetry analysis demonstrated that the crystallinity of PLA decreased with the addition of 1 wt%CB but increased with an increase in the CB content.Thermogravimetric analysis(TG)showed that the addition of CB improved the thermal stability of the blends slightly.The tensile and conductance test results indicated that adding appropriate amounts of CB could improve the electrical conductivity of the blends and maintain their mechanical properties.However,the addition of excessive amounts of CB reduced the toughness of the blends greatly.The blends exhibited tensile strength of 40.7 MPa,a Young's modulus of 830 MPa,and elongation at break of 365%at a CB content of 2 wt%,and they obtained an electrical conductivity of 8.69×10^(-7)S/m,which is about 8 time higher than that of the blends without CB.This new type of compounding material exhibited suitable electrical conductance and good mechanical performance.This study provides a method for preparing biobased polymeric blends with good conductive properties,and the developed blends exhibits application potential for antistatic packaging as a degradable material.

关 键 词：生物可降解 复合材料 导电性能 力学性能 防静电包装 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]