Wang Yaqiao, Xu Jun, Guo Baohua
Key Laboratory of Advanced Materials of Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Materials (Basel). 2025 Aug 22;18(17):3947. doi: 10.3390/ma18173947.
This study presents a facile approach to fabricate PBAT/PHBV films with superior mechanical and barrier properties by in situ forming ribbon-like lamellae, achieving a PHBV platelet-reinforced PBAT films. The fabrication involves melt blending of PBAT and PHBV, where styrene-methyl methacrylate-glycidyl methacrylate copolymer as a multifunctional reactive compatibilizer (RC) regulates PHBV domain size by forming a branched/cross-linked PBAT-B-PHBV structure. The introduction of a compatibilizer into the PBAT/PHBV system can reduce domain size and improve interfacial adhesion, thereby elevating PBAT's storage modulus and complex viscosity for optimized blow-molding processability. During blow-molding, biaxial stretching with rapid cooling transforms PHBV sea-island structures into well-aligned ribbon-like lamellae. Notably, when PHBV content is ≤30 wt.%, lamellae form in the PBAT matrix, significantly enhancing both mechanical and barrier properties. The addition of RC reduces the lateral dimensions of PHBV lamellae while increasing PHBV number density. The introduction of 0.2 wt.% RC optimizes lamellar dimensions and density to maximize permeation pathway tortuosity. Ultimately, the lamellae in the PBAT matrix yield remarkable property enhancements: yield strength increased by >600%, elastic modulus by >200%, and water vapor/oxygen transmission rate reduced by ~81% and ~85%, respectively.
本研究提出了一种简便的方法，通过原位形成带状薄片来制备具有优异机械性能和阻隔性能的PBAT/PHBV薄膜，从而实现PHBV片晶增强的PBAT薄膜。制备过程包括PBAT和PHBV的熔融共混，其中苯乙烯-甲基丙烯酸甲酯-甲基丙烯酸缩水甘油酯共聚物作为多功能反应性增容剂（RC），通过形成支化/交联的PBAT-B-PHBV结构来调节PHBV的畴尺寸。在PBAT/PHBV体系中引入增容剂可以减小畴尺寸并改善界面粘附力，从而提高PBAT的储能模量和复数粘度，以优化吹塑加工性能。在吹塑过程中，双轴拉伸并快速冷却将PHBV的海岛结构转变为排列良好的带状薄片。值得注意的是，当PHBV含量≤30 wt.%时，薄片在PBAT基体中形成，显著提高了机械性能和阻隔性能。RC的加入减小了PHBV薄片的横向尺寸，同时增加了PHBV的数量密度。引入0.2 wt.%的RC优化了薄片尺寸和密度，以使渗透路径曲折度最大化。最终，PBAT基体中的薄片产生了显著的性能提升：屈服强度提高了>600%，弹性模量提高了>200%，水蒸气/氧气透过率分别降低了约81%和约85%。
