P3/4HB/PBS共混物的物理性能及微生物降解

将不同比例的聚(3-羟基丁酸-co-4-羟基丁酸)共聚酯(P3/4HB)和聚丁二酸丁二酯(PBS)进行物理共混,通过FTIR、DSC、TG和SEM研究了复合材料的力学性能、亲水性能、热稳定性和结晶性。当PBS的添加量为10%时,复合材料的力学性能较好。与纯P3/4HB相比,拉伸强度增加了154%,达到了18.6 MPa;断裂伸长率增加了82%,为638%;弹性模量约下降94 MPa。复合物水溶解性能较小,只有0.34%,抗水性增强。DSC分析表明,2种聚合物的相容性较好。PBS的添加降低了材料的熔点,增加了结晶性能,同时减缓了材料的结晶速率。TG分析结果表明,复合材料稳定性增强,加工窗口拓宽了32℃。采用Pseudomonas.mendocina DS04-T菌株降解复合材料,当降解时间为120 h时,复合材料降解率为92.5%。

Physical Properties and Microbial Hydrolysis of Poly( 3-hydroxybutyrate-co-4-hydroxybutyrate) / Poly( butylene succinate) Blends

Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)(P3/4HB)and poly(butylene succinate)(PBS)were blended with different ratios.The mechanical property,hydrophilic performance,thermal properties,and crystallization were evaluated by FTIR,DSC,TGA,and SEM analysis.The blends had better mechanical properties,when PBS content was 10%.Compared with pure P3/4HB,the tensile strength was 18.6 MPa,which was addition to 154%,the elongation at break was 638%,which was increased to 82%,and the elastic modulus was reduced to 94 MPa.The water-solubility was smaller,which was only 0.34%,and water-resistance was stronger.DSC analysis showed that two polymers showed better miscibility.The addition of PBS reduced the melting point of the material,increased the crystallization performance,and slowed the crystallization rate of the material.TG analysis showed that the addition of PBS increased the thermal stability of the blend and its processing window was widened to 32℃.The blend was degraded by Pseudomonas.mendocina DS04-T.The degradation ratio of the blend was 92.5%when the degradation time was 120 h.