环氧大豆油对TPS/PLA复合材料性能的影响

Effect of Epoxidized Soybean Oil on Properties of TPS/PLA Composites

制备了热塑性淀粉(TPS)/聚乳酸(PLA)生物降解复合材料,探讨了环氧大豆油(ESO)对复合材料断面形貌、热流率、生物降解性能以及物理性能的影响。结果表明:ESO的添加能够促进TPS塑化,提高TPS/PLA体系相容性能,使复合材料拉伸强度、断裂伸长率和冲击强度明显提高。其中,拉伸强度、冲击强度随ESO含量的增加先升高后降低,而断裂伸长率则单纯与ESO含量呈正相关关系。在ESO含量为6份时,复合材料拉伸强度从23.9 MPa提高到24.3 MPa,在ESO含量为8份时,复合材料冲击强度从5.9 kJ/m^(2)提高到7.2 kJ/m^(2),在ESO含量为10份时,复合材料断裂伸长率从32%提高到98%。并且ESO含量的增加还能提高复合材料生物降解速率,在ESO含量为10份时,复合材料完全降解时间由240 d降至210 d,在ESO含量为4~6份时,复合材料具有良好的耐热、耐水和耐油性能。

Thermoplastic starch(TPS)/polylactic acid(PLA) biodegradable composites were prepared. The effects of epoxy soybean oil(ESO) on the cross-section morphology, heat flux, biodegradability and physical properties of the composites were investigated. The results show that the addition of ESO can promote the plasticization of TPS, improve the compatibility of TPS/PLA system, and significantly improve the tensile strength, elongation at break and impact strength of the composites. The tensile strength and impact strength first increase and then decrease with the increase of ESO content, while the elongation at break is only positively correlated with ESO content. When the ESO content is 6 phr,the tensile strength of the composite increases from 23.9 MPa to 24.3 MPa, the impact strength increases from 5.9 kJ/m^(2) to 7.2 kJ/m^(2) when the ESO content is 8 phr, and the elongation at break increases from 32% to 98% when the ESO content is 10 phr. When the content of ESO is 10 phr, the complete degradation time of the composite decreases from 240 d to 210 d.When the content of ESO is 4~6 phr, the composite has good heat resistance, water resistance and oil resistance.