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采用模压成型方法制备聚乳酸/细菌纤维素及其衍生物复合材料,并研究细菌纤维素种类和用量对复合材料机械性能、热性能、微观形貌和降解性能等的影响。结果表明:细菌纤维素可以起到增强聚乳酸基体的作用,在低质量含量(≤5%)时,随着填料的增加,力学性能呈上升趋势,其中细菌纤维素质量含量为5%时,压缩模量可提高35%,经氧化处理的醛基细菌纤维素增强效果比未处理的细菌纤维素要稍强一些,模压成型方法较注塑成型方法可有效提高材料的压缩模量。复合材料呈脆性断裂,细菌纤维素的加入使复合材料的降解速率降低,而氧化后的醛基细菌纤维素/聚乳酸复合材料的降解速率与纯聚乳酸材料相近。
The composites of polylactic acid / bacterial cellulose and its derivatives were prepared by compression molding method. The effects of bacterial cellulose types and dosage on the mechanical, thermal, microscopic and degradation properties of the composites were also studied. The results showed that bacterial cellulose can enhance the matrix of polylactic acid. At low content (≤5%), the mechanical properties of bacterial cellulose increased with the increase of filler. When bacterial cellulose content was 5% The compressive modulus can be increased by 35%. The oxidation-treated aldehyde-based bacterial cellulose has slightly stronger reinforcing effect than the untreated bacterial cellulose. Compared with the injection molding method, the compression molding method can effectively increase the compressive modulus of the material. The brittle fracture of the composites was observed. The degradation rate of the composites decreased with the addition of bacterial cellulose, while the degradation rate of the oxidized aldehyde-based bacterial cellulose / polylactic acid composite was similar to pure polylactic acid.