Kiattipornpithak Krittameth, Rachtanapun Pornchai, Thanakkasaranee Sarinthip, Jantrawut Pensak, Ruksiriwanich Warintorn, Sommano Sarana Rose, Leksawasdi Noppol, Kittikorn Thorsak, Jantanasakulwong Kittisak
School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Mae-Hea, Mueang, Chiang Mai 50100, Thailand.
Cluster of Agro Bio-Circular-Green Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai 50100, Thailand.
Polymers (Basel). 2023 Sep 17;15(18):3789. doi: 10.3390/polym15183789.
A novel poly (lactic acid) (PLA) composite with excellent mechanical properties, toughness, thermal stability, and water resistance was developed using a reactive melt-blending technique. PLA was melt mixed with epoxy resin (EPOXY) and bamboo pulp (PULP) to improve its reaction and mechanical properties. FTIR analysis confirmed the successful reaction of the PLA/EPOXY/PULP composites; the epoxy groups of EPOXY reacted with the -COOH groups of PLA and the -OH groups of PULP. The PLA/EPOXY/PULP5 composite showed a high tensile strength (67 MPa) and high toughness of 762 folding cycles, whereas the highest tensile strength was 77 MPa in the PLA/EPOXY5/PULP20 sample. SEM images presented a gap between the PLA and PULP; gap size decreased with the addition of EPOXY. The T of the PLA decreased with the EPOXY plasticizer effect, whereas the T did not significantly change. PULP induced crystallinity and increased Vicat softening of the PLA/PULP and PLA/EPOXY/PULP composites. The EPOXY reaction of the PLA/PULP composites improved their tensile properties, toughness, thermal stability, and water resistance.
采用反应性熔融共混技术制备了一种具有优异机械性能、韧性、热稳定性和耐水性的新型聚乳酸（PLA）复合材料。将PLA与环氧树脂（EPOXY）和竹浆（PULP）熔融混合以改善其反应性能和机械性能。傅里叶变换红外光谱（FTIR）分析证实了PLA/EPOXY/PULP复合材料的成功反应；EPOXY的环氧基团与PLA的-COOH基团以及PULP的-OH基团发生了反应。PLA/EPOXY/PULP5复合材料表现出较高的拉伸强度（67 MPa）和762次折叠循环的高韧性，而在PLA/EPOXY5/PULP20样品中最高拉伸强度为77 MPa。扫描电子显微镜（SEM）图像显示PLA和PULP之间存在间隙；随着EPOXY的加入，间隙尺寸减小。由于EPOXY的增塑作用，PLA的玻璃化转变温度（Tg）降低，而熔点（Tm）没有显著变化。PULP诱导了PLA/PULP和PLA/EPOXY/PULP复合材料的结晶度并提高了维卡软化温度。PLA/PULP复合材料与EPOXY的反应改善了它们的拉伸性能、韧性、热稳定性和耐水性。
