蔗髓增强热塑性淀粉可降解复合材料制备与性能研究

Studies on Preparation and Properties of Biodegrdable Thermoplastic Starch/Bagasse Pith Composites

采用熔融共混法制备了热塑性淀粉/蔗髓复合材料(TPS/BP),并对该复合材料的力学性能、吸湿性和微观结构进行了研究,通过红外光谱(FTIR)和扫描电子显微镜(SEM)分析了蔗髓增强热塑性淀粉的机理。结果表明:随着BP用量的增加,TPS/BP的拉伸强度逐渐提高,而断裂伸长率则明显下降;拉伸弹性模量则呈先增大后减小的趋势,在BP用量为20%时,拉伸弹性模量达到最大值(159.13 MPa)。BP的加入降低了TPS的吸水率,而且随其用量的增加,TPS/BP的吸水率逐渐降低。红外光谱和微观形貌分析表明,BP和TPS基体之间形成了分子间氢键,二者之间具有良好的界面相容性。

The biodegradable composites were prepared based on thermoplastic starch（TPS） and bagasse pith（BP） by melting blend method. The composites were evaluated in terms of mechanical properties and water absorption. The reinforcement mechanism of BP reinforced TPS matrix was also analyzed by FTIR and SEM. The results show that the tensile strength of TPS/BP increases with increasing BP content, while elongation at break of composites decreases. The elastic modulus of TPS/BP increases first and then decreases, and the maximum value is 159.13 MPa. Water absorption of TPS decreases with the addition of BP at 100% RH. FTIR and SEM illustrated that the intermolecular hydrogen bondings and strong interfacial interactions forms in the BP and TPS, which led to reinforcing effect of BP.