Bhardwaj Rahul, Mohanty Amar K, Drzal L T, Pourboghrat F, Misra M
School of Packaging, 130 Packaging Building, 2100 Engineering Building, Michigan State University, East Lansing, Michigan 48824, USA.
Biomacromolecules. 2006 Jun;7(6):2044-51. doi: 10.1021/bm050897y.
Novel "green" composites were successfully fabricated from recycled cellulose fibers (RCF) and a bacterial polyester, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) by melt mixing technique. Various weight contents (15%, 30%, and 40%) of the fibers were incorporated in the PHBV matrix. The effect of the fiber weight contents on the thermal, mechanical, and dynamic-mechanical thermal properties of PHBV was investigated and a comparative property analysis was performed with RCF-reinforced polypropylene (PP) composites. The tensile and storage moduli of the PHBV-based composites were improved by 220% and 190%, respectively, by reinforcement with 40 wt % RCF. Halpin-Tsai and Tsai-Pagano's equations were applied for the theoretical modeling of the tensile modulus of PHBV-based composites. The heat deflection temperature (HDT) of the PHBV-based composites was increased from 105 to 131 degrees C, while the coefficient of linear thermal expansion (CLTE) value was reduced by 70% upon reinforcement with 40 wt % RCF. The PHBV-based composites had also shown better tensile and storage moduli and lower CLTE values than PP-based composites. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) were used to study the melting behavior, thermal stability, and morphology of the composite systems, respectively.
通过熔融共混技术，成功地用回收纤维素纤维（RCF）和细菌聚酯聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）制备了新型“绿色”复合材料。将不同重量含量（15%、30%和40%）的纤维加入到PHBV基体中。研究了纤维重量含量对PHBV热性能、力学性能和动态力学热性能的影响，并对RCF增强聚丙烯（PP）复合材料进行了性能对比分析。用40 wt%的RCF增强后，基于PHBV的复合材料的拉伸模量和储能模量分别提高了220%和190%。Halpin-Tsai方程和Tsai-Pagano方程用于基于PHBV的复合材料拉伸模量的理论建模。基于PHBV的复合材料的热变形温度（HDT）从105℃提高到131℃，而用40 wt%的RCF增强后，线性热膨胀系数（CLTE）值降低了70%。基于PHBV的复合材料还显示出比基于PP的复合材料更好的拉伸模量和储能模量以及更低的CLTE值。分别使用差示扫描量热法（DSC）、热重分析（TGA）和扫描电子显微镜（SEM）来研究复合体系的熔融行为、热稳定性和形态。
