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本研究合成了一种含聚乙二醇单甲醚(MPEG1000)结构的咪唑基离子液体(IL-MPEG1000),并采用核磁共振(1 H NMR)对其进行了结构确认。通过熔融共混法制备系列含IL-MPEG1000的聚乳酸(PLA)试样,应用差示扫描量热法(DSC)、热失重测试(TG)、扫描电子显微镜(SEM)研究了IL-MPEG1000对PLA性能的影响。DSC结果表明,IL-MPEG1000促使PLA玻璃化转变温度的降低,并导致PLA试样在升温过程中出现了明显的结晶峰与熔融双峰,说明IL-MPEG1000提高了PLA链段的运动能力。SEM观察到含IL-MPEG1000的PLA试样出现韧断现象,表明IL-MPEG1000起着增韧作用。然而,TG分析表明IL-MPEG1000的加入降低了PLA的热稳定性。
In this study, an imidazolium ionic liquid (MPEG-1) containing polyethylene glycol monomethyl ether (MPEG1000) was synthesized and confirmed by 1H NMR. A series of polylactic acid (PLA) samples containing IL-MPEG1000 were prepared by melt blending method. The effects of IL-MPEG1000 pairs on the PLA samples were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and scanning electron microscopy PLA performance. The results of DSC showed that IL-MPEG1000 reduced the glass transition temperature of PLA and led to obvious crystallization peaks and melting bimodal peaks during the heating process of PLA samples, indicating that IL-MPEG1000 increased the kinetic capacity of PLA segments. The ductile fracture of PLA samples containing IL-MPEG1000 was observed by SEM, indicating that IL-MPEG1000 plays a toughening role. However, TG analysis showed that the addition of IL-MPEG1000 reduced the thermal stability of PLA.