Mechanical Regulation Of P(3,4)HB Based On Crop Components

Due to the depletion of fossil energy and serious environmental issues,more and more people focus on the “green material”,P(3,4)HB was considered to be a promising material in many fields because it has excellent biodegradability,melt processability,and chemical resistance.Despite numerous advantages,the practical application of P(3,4)HB as plastic products is restricted by their high cost and compromised mechanical properties(such as brittleness and low toughness).Therefore,it is necessary to prepare P(3,4)HB modified composite materials with excellent performance and low cost.Compared with chemical modification,physical blending(melt blending)of polyester with another type of material is regarded as a promising strategy for enhancing performance and resulting in composites of lower cost and/or ease of manufacturing.Among them,environmentally friendly and renewable agricultural crude product or industrial by-products have higher potential to produce low-cost,high value-added biodegradable materials.The main idea of this paper is to use biomass filer(Dehulled camelina meal and konjac flying powder)as reinforcing filler to prepare the low cost and high added value polyester composite material.The main contents of this paper are as follows:(1)A series of composites with different filler ratios were prepared by mixing and hot-pressing to study the effect of different content of filler on the properties of the composites;(2)The effect of the components on the properties of the composites was studied and the mechanism of multi-component synergistic effect on the mechanical properties of composite materials was discussed(3)The interfacial interaction between the filler and the matrix was simulated and simulated by experimental data(Including the influence of the physical and chemical factors of different polyesters).(4)The mechanical properties regulation method of the modified biodegradable materials by DeCM and konjac flying powder were established.The main achievements of this paper include:(1)The incorporation of 25 parts DeCM into the composite promoted an impressive increase of 461% in the elongation at break of the P(3,4)HB-based composites.Extraction of components from the DeCM(oil and protein)showed that oil(plasticizing effect)had a critical plasticization effect that enhanced the ductility of the composites.The results of dynamic rheological analysis show that the synergistic effect of oil and protein is a key factor in the mechanical properties of composites.(2)Compared with neat materials,the presence of DeCM filler had no significant effect on the thermal properties of the composites and preserved the original crystalline structure of the polyester component in the composites.(3)With 10 parts of KFP,the elongation at break and tensile strength of P(3,4)HB increased by 205% and 111%,respectively.Qualitative analysis of adhesion,the enhancing effect of KFP was mainly attributed to its rigid and strong adhesion to P(3,4)HB.(4)The P(3,4)HB-based composites exhibited no significant difference in the values of glass transition temperatures,melting temperatures,and crystallization properties in comparison to those of neat P(3,4)HB.(5)The addition of konjac fly powder greatly improved the thermal stability of the composites,and the initial decomposition temperature increased from 220 ° C to 260 ° C with only 5 parts of filler.(6)While preserving their mechanical properties,the introduction of DeCM in the composites will reduce costs by 19-23% for P(3,4)HB,the introduction of KFP in the composites will reduce costs by 5% ? 23%.Konjac fly powder and Dehulled camelina meal as a biomass filler for the field of composite materials can not only expand its use range but also create good economic benefits.(7)For P(3,4)HB,the mechanical properties can be adjusted by adding the plasticizing composition;on the other hand,from the structure,the appropriate viscosity is conducive to the dispersion of the filler,while the lower crystallinity and which reduces the phase separation so that the adhesion between the filler and the substrate is enhanced.The above factors can be used to control the mechanical properties of P(3,4)HB composites.