林业科学2019，Vol.55Issue(3)：125-133,9.DOI:10.11707/j.1001-7488.20190314
木粉增强P34HB生物复合材料的制备及其结构性能表征
Preparation and Characterization of the P34HB Composite Reinforced by Wood Flour
摘要
Abstract
[Objective] To improve the performance and reduce the costs, the poly (3-hydroxybutyrate-co-4-hydroxybutyrate) (P34 HB) was reinforced with wood flour. The optimum ratio of wood flour was determined by experimental research.[Method] Using Chinese white poplar (Populus tomentosa) flours and P34 HB as raw materials, the biodegradability composites were prepared by hot pressing method. The structure and properties of the biodegradability composites were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), dynamic mechanical analysis (DMA) and mechanical property analysis.[Result] Results show that the tensile strength, breaking elongation and flexural strength of the composite increase firstly and then decrease with the increasing of wood flour, but the impact strength decreases continuously. The tensile strength, elastic modulus and Young's modulus of the composites increase by 89％, 59％ and 103％, respectively. The storage modulus E' of the composites is continual increasing with the wood flour content, while the tanδ is decreasing initially and then increasing. The dynamic stiffness of the composite is better than static stiffness, for the higher frequency modulus is greater than the lowerone.Compared with P34 HB, the composites show the wider thermal decomposition range, the slower pyrolysis rate and the higher pyrolysis residual mass.[Conclusion] With the increase of wood flour content, the structure of the composites is further dense. The storage modulus and brittleness of the composites increase because of hindering the movement of the molecular chain of bioplastics P34 HB by wood flour. At the same time, the transcrystallinity of P34 HB with high crystallinity and developed layer structure is developed bywood fibers as nucleating agents, strengthening the interfacial bonding strength between wood flour and P34 HB, and obviously improving the mechanical properties and thermal stability of the composites. It is also found that the optimum wood flour content of P34 HB/wood flour composite is 50％.关键词
P34HB/毛白杨木粉/生物复合材料/力学性能/热性能Key words
P34HB/Populus tomentosa wood flour/biocomposite/mechanical properties/thermal performance分类
通用工业技术引用本文复制引用
安胜男,马晓军,朱礼智..木粉增强P34HB生物复合材料的制备及其结构性能表征[J].林业科学,2019,55(3):125-133,9.基金项目
天津市自然科学基金项目(18JCYBJC90100) （18JCYBJC90100）
