聚(3-羟基丁酸酯-co-4-羟基丁酸酯)/酶解木质素共混材料的制备及性能

双螺杆熔融共混制备了全生物降解的聚(3-羟基丁酸酯-co-4-羟基丁酸酯)(P3HB4HB)/纤维素酶解木质素(CEL)共混物,分别用热重分析、拉伸弯曲试验、冲击试验、扫描电镜(SEM)考察了CEL含量对共混物热学、力学性能及微观形貌的影响。研究发现,CEL的加入增强了材料的热稳定性,也提高了材料的模量,但断裂伸长率、拉伸强度、弯曲强度和冲击强度平缓降低,当CEL的质量分数为20%CEL,拉伸、弯曲、冲击三种强度的保持率都大于93%;SEM显示,P3HB4HB和CEL相容很好。CEL填充P3HB4HB不仅能降低材料成本,还能对材料的热学、力学性能保持较好或起改善作用,CEL最宜添加的质量分数为20%。

Poly(3-Hydroxylbutyrate-Co-4-Hydroxylbutyrate) Blended with Cellulolytic Enzyme Lignin: Thermal,Mechanical Properties and Morphology Evaluation

Biodegradable blends of poly(3-hydroxylbutyrate-co-4-hydroxylbutyrate)(P3HB4HB) / cellulolytic enzyme lignin(CEL) were prepared via twin-screw extrusion.The effects of CEL contents on the thermal,mechanical properties and the morphology of the blends were investigated by thermogravimetry,tensile,flexible,impact test,and scanning electron microscope(SEM),respectively.It was found that,the thermal stability of the blends was enforced with CEL incorporation.Mechanical test also shows that,with increasing CEL content,the tensile and flexural modulus increase,while the elongation at break and the tensile,flexural and impact strength decrease.However,when the CEL of their original ones is at 20%.these three strengths all remain above 93%.Morphology observations by SEM reveal that the CEL and the P3HB4HB are in a good miscibility.All the results suggest that CEL,used as filler in P3HB4HB,can not only reduce the cost of P3HB4HB-based materials,but also show good retention or improvement in thermal and mechanical properties for the blends,Considering the cost and performance,the optimal content of CEL is at 20%.