一种全生物基自修复材料的制备及其性能研究

Preparation and Performance of a Bio-based Self-healing Material

以松香为原料,通过Diels-Alder反应合成丙烯海松酸(APA)并提纯,然后将APA和环氧大豆油(ESO)酯化,制备了不同羧基/环氧基物质的量比的APA和ESO共聚物复合材料(APA-ESO),利用红外光谱、热重分析、动态机械分析、机械性能分析等方法对复合材料的性能进行探讨。因为APA的刚性结构,复合材料的玻璃化转变温度(Tg)远高于室温,羧基/环氧基物质的量比值1.25的复合材料(APA-ESO1.25)的Tg最高,达到85.4℃;且材料具有优异的机械性能,其中物质的量比值1.00的复合材料(APA-ESO1.00)拉伸强度达到18.82 MPa。同时材料具有优异的自修复性能和再加工性能。180℃下,5 min时羧基/环氧基比值0.75的复合材料(APA-ESO0.75)的自修复效率达到90.3%,30 min自修复效率可以达到92.9%。复合材料APA-ESO1.00可以通过热压进行再加工,再加工后机械性能可以达到原始样品的89%。此外,APA-ESO1.00还具有形状记忆效应。

Using rosin as raw material,acrylipimaric acid(APA)was synthesized through Diels-Alder reaction and purified,and then the esterification reaction between APA and epoxidized soybean oil(ESO)were performed to prepare a range of APA and ESO copolymer composite materials(APA-ESO)with different molar ratios of carboxyl and epoxy group.The properties of composite materials were characterized by Fourier transform infrared spectroscopy(FT-IR),thermal gravimetric analysis(TGA),dynamic mechanical analysis,mechanical performance analysis and other methods.Because of the rigid structure of APA,the glass transition temperature(Tg)of the composite material was much higher than room temperature.The Tg of APA-ESO1.25 with the molar ratio of carboxyl and epoxy group 1.25 was the highest(85.4℃)and it showed excellent mechanical properties.The tensile strength of APA-ESO1.00 with the molar ratio of 1.00 reached 18.82 MPa.At the same time,the composite materials exhibited excellent self-repair behavior and reprocessing performance.At 180℃,the self-repair efficiency of APA-ESO0.75 with the molar ratio of 0.75 could reach 90.3%at 5 min,and the self-repair efficiency could reach 92.9%at 30 min.Moreover,the composite material APA-ESO1.00 could be reprocessed by hot pressing,and the mechanical properties after reprocessing could reach 89%of the original sample.In addition,APA-ESO1.00 also had a shape memory effect.