异氰尿酸三缩水甘油酯诱导扩链改性对聚己二酸/对苯二甲酸丁二酯发泡性能的优化  

Foaming Performance of Poly(butylene adipate-co-terephthalate)Optimized Through Isocyanuric Triallyl Cyanurate Induced Chain Extension Modification

作　　者：沈超 蒋团辉[1,2] 李胜男 朱能贵 曾祥补 熊一鸣 Chao Shen;Tuanhui Jiang;Shengnan Li;Nenggui Zhu;Xiangbu Zeng;Yiming Xiong(National Engineering Research Center for Compounding and Modification of Polymer Materials,Guiyang 550022,China;Guizhou Material Technology Innovation Base,Guiyang 550022,China)

机构地区：[1]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550022 [2]贵州省材料技术创新基地,贵州贵阳550022

出　　处：《高分子材料科学与工程》2024年第5期67-75,共9页Polymer Materials Science & Engineering

基　　金：贵州省科学技术厅项目(黔科合服企[2023]001号);中央引导地方科技发展资金(黔科合中引地[2023]035号);贵州省科技计划项目(黔科合支撑[2022]一般060号);贵阳市白云区科技计划(白科合同[2020]36号)。

摘　　要：聚己二酸/对苯二甲酸丁二酯(PBAT)的低熔体强度限制了其在轻量化方面的应用。文中采用异氰尿酸三缩水甘油酯(TGIC)扩链改性PBAT,以改善其熔体强度,从而提高其在注塑成型条件下的发泡性能。通过使用差示扫描量热仪、旋转流变仪和万能力学试验机,研究了不同含量TGIC对PBAT熔融结晶行为、流变性能和力学性能的影响;使用扫描电镜观察了经TGIC扩链改性后不同PBAT样品的发泡性能。结果表明,适量的TGIC能诱导PBAT形成长链支化结构,提高分子链交联度,降低其结晶度、结晶温度和熔融温度,同时提高其拉伸强度,但降低了断裂伸长率。改性后的PBAT具有较高的储能模量、复数黏度和较低的损耗因子,表现出应变硬化行为,熔体弹性和强度得到提高。发泡性能分析结果显示,在注塑发泡条件下,含4%TGIC的样品具有最小泡孔直径、最大泡孔密度和均匀泡孔分布,展现出理想泡孔结构,说明经TGIC扩链改性后,PBAT熔体强度得以改善,发泡性能提升。The application of poly(butylene adipate-co-terephthalate)(PBAT)in lightweight applications is hindered by its low melt strength.In this study,isocyanuric triallyl cyanurate(TGIC)was employed to enhance the melt strength of PBAT and improve its foamability under injection molding conditions.The effects of different TGIC contents on the melt crystallization behavior,rheological properties,and mechanical properties of PBAT were studied by differential scanning calorimetry(DSC),rotational rheometer,and universal testing machine.Additionally,scanning electron microscopy(SEM)was used to observe the foaming performance of different PBAT samples after TGIC modification.The results of the study demonstrate that the introduction of an appropriate amount of TGIC leads to the formation of long-chain branching in PBAT,which increases crosslinking degree and decrease the crystallinity,crystallization temperature,and melting temperature of PBAT.Additionally,it results in improved tensile strength but reduced elongation at break.The modified PBAT exhibits higher storage modulus,complex viscosity,and lower loss tangent factor,displaying strain hardening behavior,indicating the improvement of melt elasticity and strength.The foamability tests demonstrate that under injection foaming conditions,the sample containing 4%TGIC exhibits the smallest cell diameter,highest cell density,and uniform cell distribution,demonstrating an ideal cell structure and indicating the successful enhancement of PBAT melt strength and foamability through TGIC chain extension modification.

关 键 词：聚己二酸/对苯二甲酸丁二酯 扩链改性 熔体强度 发泡性能 

分 类 号：TQ328[化学工程—合成树脂塑料工业]