Synthesis And Properties Of Plastic Processing Polymer Materials Based On Woody Oil

Plant oil is one of the most attractive renewable resources because of its universal availability,biodegradability,low cost,environmental friendliness and renewability.Utilizing the unique active functional groups in vegetable oils,a variety of chemical reactions can be carried out to produce functionalized Plant oil-based derivatives,and some of them have important industrial applications.Some plant oil-based derivatives have been used in resins,composites,coatings,adhesives,surfactants,lubricants,cosmetics and biomedical applications.In China’s forestry resources,woody oil is an important branch of vegetable oil industry.However,at present,the application of most wood oils only stays in the low value-added stage,the comprehensive utilization degree is low,and there are few kinds of high value-added products.Therefore,it is an urgent task to study new products of wood oil deep processing,broaden its application fields and increase its added value.In this paper,palm oil based epoxy monomer with high conversion rate and high molecular weight palm oil based epoxy polymer were developed from renewable resources such as palm oil.On this basis,the epoxide with reconfigurable shape memory and recyclable performance was prepared by using palm oil-based epoxy polymer.The structure and properties of the products were analyzed by FT-IR,~1HNMR,DMA and rheological analyzer.The relationship between the composition structure of epoxy resin with different curing ratio and the properties of thermodynamics,mechanics and reprocessing is discussed.In addition,the paper uses tung oil as raw material to prepare functional Tung oil-based thermoplastic polymer by using the existence of highly unsaturated carbon carbon conjugation double bond in tung oil.The research provides theoretical basis and technical basis for the design and development of new plant oilbased polymer materials.The main conclusions are as follows:First,using palm oil as raw material,palm oil-based epoxy monomers were prepared by amination,esterification and epoxidation,and then high molecular weight epoxy polymers were synthesized by free radical polymerization.The target product with single structure was obtained by separation and purification.FT-IR and ~1HNMR confirmed that the product was successfully prepared.The effect of epoxy group on the conversion and molecular weight was studied,that is,the conversion of monomer was only 84 % when the double bond was not converted to epoxy group,and the molecular weight of polymer was Mn = 30200 after the double bond was converted to epoxy group.The conversion can easily reach 100 % by radical polymerization,and the molecular weight of the polymer is 78800.This indicates that the polymerization efficiency of epoxidized monomers is high,and epoxy monomers inhibit the chain transfer of free radical polymerization in aqueous solution.Second,palm oil-based epoxy resins with different curing ratios were prepared by using palm oil-based epoxy polymers as raw materials and citric acid as curing agent.After heat treatment,the rearranged topological structure of ester exchange network system was introduced without catalyst.The thermal stability and mechanical properties of the materials were studied by thermogravimetric analysis,tensile test and dynamic thermomechanical properties test Performance.It is found that the thermal stability and mechanical properties of the material increase significantly with the increase of curing ratio,and the thermal decomposition rate decreases rapidly when heated.When the curing ratio is EP-CA-10 and EP-CA-20,the materials behave like soft elastomers,while EP-CA-40,EP-CA-60,EP-CA-80 and EP-CA-100 behave more like plastics.With the increase of CA content,the ultimate tensile strength increases from 1.2 MPa to 28.9 MPa,and the tensile strain decreases from 109 % to 12 %.Third,through hot pressing,rheological characterization,shape memory and other methods to further explore the ability of material reprocessing and remodeling.It was found that the material was sheared to pieces and then hot pressed at 170 ℃ and 10 MPa for 12 min to form a smooth and transparent epoxy resin film,which showed that the epoxy resin had good recyclability.EP-CA-40 epoxy resin was used to observe the process of permanent shape,temporary shape reconstruction and shape recovery.The process of shape fixation and recovery was repeated three times,and no obvious damage was found.Each time,the epoxy resin completely recovered to permanent shape.These results show that these EP-CA epoxy resins not only have good rcycle performance,but also have good reconfigurable shape memory performance.Fourth,Tung oil based thermoplastic polymer was prepared by free radical polymerization with tung oil as raw material.The molecular structure of tung oil contains three conjugated double bonds,ester groups and other functional groups.Tung oil based monomers with polymerized double bonds were synthesized from tung oil,dimethylaminoethanol and methacrylic anhydride by amidation and esterification.Due to the special double bond of fatty acid chain,Tung oil-based modified monomer was prepared by Diels alder reaction with maleic anhydride.Thermoplastic polymers containing functional groups in fatty acid chain were prepared by radical polymerization of modified monomers with azobisisobutyrone(AIBN)as initiator.The polymer was characterized by various testing methods.