College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, People's Republic of China; Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing, People's Republic of China.
College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, People's Republic of China; College of Materials Science and Engineering, Fujian University of Technology, Fujian 350118, People's Republic of China.
Int J Biol Macromol. 2024 Feb;259(Pt 2):129310. doi: 10.1016/j.ijbiomac.2024.129310. Epub 2024 Jan 10.
Developing biobased materials is a considerably effective approach to save fossil resources and reduce emissions. Biobased polyamide 56 (PA56) is an excellent engineering material, but it has low toughness. Herein, to enhance the toughness of PA56, an ultra-tough biodegradable material, i.e., poly (butylene adipate-co-terephthalate) (PBAT) was introduced into PA56. Moreover, a self-synthesized epoxy-terminated hyperbranched polyester (EHBP) was used to improve the compatibility of the blended materials. The results of differential scanning calorimetry and Fourier-transform infrared spectroscopy indicated that the epoxide group of EHBP could react with PA56 and PBAT to form a block-like polymer structure and limit the crystallization behavior of the blends. The scanning electron microscopy results show that the addition of EHBP considerably reduced the dispersed-phase size in the blends, forming a nanoscale island structure. Moreover, the hydrogen bonds formed between EHBP and PA56/PBAT enhanced the intermolecular interaction between the two materials. Thus, PA56 blends with ultrahigh toughness were successfully prepared. The prepared PA56/PBAT/EHBP blend exhibited a notch impact strength of 20.71 kJ/m and a breaking elongation of 38.3 %, which represent increases of 427.3 % and 252.8 %, respectively, compared with those of pure PA56. Thus, the proposed method is suitable for toughening PA56 and broadening its applications.
开发生物基材料是节约化石资源和减少排放的一种非常有效的方法。生物基聚酰胺 56（PA56）是一种优秀的工程材料，但它的韧性较低。在此，为了提高 PA56 的韧性，即引入了一种超韧可生物降解材料，即聚对苯二甲酸丁二酸丁二醇酯（PBAT）。此外，还使用了一种自制的端环氧超支化聚酯（EHBP）来改善共混材料的相容性。差示扫描量热法和傅里叶变换红外光谱的结果表明，EHBP 的环氧基团可以与 PA56 和 PBAT 反应，形成块状聚合物结构，并限制共混物的结晶行为。扫描电子显微镜的结果表明，EHBP 的添加大大降低了共混物中分散相的尺寸，形成了纳米级的海岛结构。此外，EHBP 与 PA56/PBAT 之间形成的氢键增强了两种材料之间的分子间相互作用。因此，成功制备了具有超高韧性的 PA56 共混物。所制备的 PA56/PBAT/EHBP 共混物的缺口冲击强度为 20.71kJ/m，断裂伸长率为 38.3%，分别比纯 PA56 提高了 427.3%和 252.8%。因此，所提出的方法适用于增韧 PA56 并拓宽其应用。
