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采用乳酸和丁二酸酐为原料通过熔融聚合制备了端羧基聚乳酸(HOOC-PLA),以其和马来酸酐(MAH)在引发剂作用下通过溶液回流的方法制备了生物基环氧固化剂(HOOC-PLA-g-MAH)。采用傅里叶红外光谱,示差热扫描量热仪,动态热机械分析仪及拉力实验机等对环氧树脂固化物的结构和性能进行了表征。结果表明:环氧树脂/HOOC-PLA-g-MAH/2,4,6-三(二甲胺基甲基)苯酚(DMP-30)体系在质量比为1:0.4:0.01,90℃/4 h+110℃/1 h条件下可完全固化。固化物弯曲强度和拉伸强度分别为150 MPa和65.1 MPa,Tg为106℃,力学性能和热稳定性能较好。
Poly (lactic-co-glycolic acid) (HOOC-PLA) was prepared by melt polymerization using lactic acid and succinic anhydride as raw materials. Bio-based epoxy curing agent was prepared by refluxing MAH with maleic anhydride (MAH) (HOOC-PLA-g-MAH). The structure and properties of cured epoxy resin were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic thermal mechanical analyzer and tensile testing machine. The results showed that the epoxy resin / HOOC-PLA-g-MAH / 2,4,6-tris (dimethylaminomethyl) phenol (DMP-30) 4 h +110 ℃ / 1 h conditions can be completely cured. The flexural strength and tensile strength of the cured product are 150 MPa and 65.1 MPa respectively, the Tg is 106 ℃, and the mechanical properties and thermal stability are good.