Sonoyama Arisa, Yamaguchi Masayuki
Kaneka Corporation, 5-1-1 Torikai-Nishi, Settsu 566-0072, Osaka, Japan.
Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, Nomi 923-1292, Ishikawa, Japan.
Polymers (Basel). 2025 May 12;17(10):1318. doi: 10.3390/polym17101318.
In the present study, we prepared crosslinked particles of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) to investigate their performance as impact modifiers. The mechanical properties of crystalline PHBH comprising 5.6 mol% 3-hydroxyhexanoate (3HHx) were modified by the addition of amorphous particles of PHBH with 28 mol% 3HHx (PHBH28). The tensile impact strength of the mixture was improved by the addition of PHBH28 particles, particularly when they were crosslinked. The size of the dispersed uncrosslinked PHBH28 particles was sensitive to the processing method. However, the crosslinked PHBH28 particles retained their form under any processing conditions, and a smaller particle size was achieved, leading to shear yielding. The samples containing crosslinked PHBH28 particles exhibited intense stress-whitening after impact testing. The resulting voids were ascribed to cavitation in the particles, which must have been responsible for the improved mechanical properties of the samples. Moreover, the crosslinked particles did not affect the excellent biodegradability of PHBH in seawater.
在本研究中，我们制备了聚（3-羟基丁酸酯-co-3-羟基己酸酯）（PHBH）的交联颗粒，以研究其作为抗冲改性剂的性能。通过添加含28 mol% 3-羟基己酸酯（3HHx）的无定形PHBH颗粒（PHBH28），对含5.6 mol% 3HHx的结晶PHBH的力学性能进行了改性。添加PHBH28颗粒可提高混合物的拉伸冲击强度，尤其是当它们交联时。分散的未交联PHBH28颗粒的尺寸对加工方法敏感。然而，交联的PHBH28颗粒在任何加工条件下都能保持其形态，并获得了更小的粒径，从而导致剪切屈服。含有交联PHBH28颗粒的样品在冲击试验后表现出强烈的应力发白现象。产生的空隙归因于颗粒中的空化现象，这必定是样品力学性能改善的原因。此外，交联颗粒不影响PHBH在海水中的优异生物降解性。
