Preparation And Characterization Of The Lignin/PBAT/PES Composite Materials

Along with the increasingly exhausted fossil fuels and the prominent problems of white pollution, there are much more attention has been attracted into the environmentally friendly materials, which are renewable and degradable. Lignin is such kind of high polymer material which is renewable, biodegradable, nontoxic, and also its reserves is second only to cellulose in nature. It widely exists in the plants of seeds, and constitutes the fundamental framework of plants with cellulose and hemi-cellulose. As a by-product of slurrying paper-making industry, its utilization ratio is low while it has a high productivity, so large amounts of lignin has been burned or dumped into the environment. Therefore, it is significant to strengthen the research and application development of lignin in promoting full utilization of natural resources and harmonious sustaining development of environment protection and slurrying paper-making industry. In view of the high content of hydroxyl and aromatic rigid structure, which polarity is very strong, it is adverse to respectively processed into model. Melting and blending modification with lignin and well flexible aliphatic polyesters is what I considered. Because of the flexible aliphatic chain and rigid aromatic bonds in the structure of PBAT, it has good high temperature tolerance and toughness. Meanwhile, in consequence of the existence of ester bonds, it also has biodegradability. PES is also a kind of high polymer material, but its temperature tolerance is bad, the inherence is brittle, and is so difficult to process into model. The above two materials are not inexpensive,therefore, this paper is resort to melt and blend with LS, PBAT and PES,studying the properties of the blend in addition.The blend we got is by blending LS, PBAT and PES, I discovered that there is an interaction in those three materials(LS, PBAT and PES)through the analysis of infrared total reflection and differential scanning calorimetry, etc. It has great influence on their properties.When LS, which is in the collective of polyester of PBAT and PES,contains more than 25 wt%, the agglomeration will obviously emerge particles and can’t film after pattern analysis. The mechanical performance test of the structure turned out that tensile strength and elongation at break will be decreased with the increasing content of LS.But the Young’s modulus is increased markedly, this phenomenon has a direct correlation between the rigid structure of LS and the weak interactions of the blend.Grafting modification in aqueous solution with LS and ammoniation maleic anhydride, and produced an new modified LS.Then do some research and representation on the respect of infrared and thermal properties. And meanwhile, melting and blending the modified material with PBAT and PES under the same circumstances of the blend,which is got by the material of LS, PBAT and PES. There is an new blend produced, it is the blend of MLS, PBAT and PES. I discovered that there is a stronger interaction among grafted modified LS, PBAT and PES. The particles in the grafted modified lignin are uniformly dispersed in the matrix of blended aliphatic polyester. As to the mechanical strength compared with the blend, its tensile strength has a great improve. Owing to the partial degradation of aliphatic polyester while processing, the molecular weight can be increased by connecting polyester and LS after join the chain extender ADR, it improves the blend’s mechanical property. The blend’s toughness has a bit of improvement after join plasticizer, but tensile strength has a decline than before.