PBS-co-Glu共聚酯与磷酸酯淀粉共混制得复合材料性能

Preparation and Properties of PBS-co-Glu Copolyester and Phosphate Starch Blended Composites

以L-谷氨酸(Glu)对聚丁二酸丁二醇酯(PBS)进行亲水改性,制得不同Glu含量(以丁二酸的物质的量为基准,下同)的共聚酯,标记为PBS-co-Glun%(n=O、1、2、3、4、5),并运用乳液一浇注成型法将PBS-co-Glun%与磷酸酯淀粉(PPS)共混,制备了PBS-co-Glun%/PPS复合材料。采用FTIR、1HNMR表征了PBS-co-Glun%共聚酯的化学结构;采用XRD、POM、SEM、光透过率和拉伸实验对共聚酯的亲水性、结晶性能及复合材料的表面形貌、光透过率和力学性能进行了测试,脂肪酶降解实验测试了复合材料的降解性能。结果表明:随Glu含量的增加,PBS-co-Glun%/PPS复合材料的断裂伸长率和降解率均有所增加;当Glu含量为4%时,PBS-co-Glu4%/PPS复合材料断裂伸长率达到最大值98%;与PBS/PPS复合材料酶降解率36.80%相比,PBS-co-Glu5%/PPS复合材料酶降解率提高到42.79%;所有材料中PBS-co-Glu2%/PPS复合材料的光透过率最大。

Hydrophilic modification of poly(butylene succinate)(PBS) by L-glutamic acid(Glu) was conducted to obtain a series of copolyesters containing different Glu content(based on the amount of substance of succinic acid, the same below), named as PBS-co-Glun%(n=0, 1, 2, 3, 4, 5). Then, PBS-coGlun%/PPS composites were prepared by emulsion casting molding method through blending PBS-coGlun% copolyester with phosphate starch(PPS). These PBS-co-Glun% copolyesters were characterized by FTIR and 1 HNMR. Their crystallization property and hydrophilicity were investigated by XRD, POM and water contact angle measurement. The morphologies of these composites were observed by SEM. Their light transmittance and mechanical properties were studied. The degradability of the composites was measured by lipase degradation experiment. The results showed that the elongation at break and degradation rate of PBS-co-Glun%/PPS composites increased with the increase of Glu content. The elongation at break for PBS-co-Glu4%/PPS composites reached a maximum value(98%). The degradation rate of PBS/PPS composites was 36.80%, while that of PBS-co-Glu5%/PPS composites increased to 42.79%. The light transmittance of PBS-co-Glu2%/PPS composites was the best among the prepared composites.