Preparation and Properties of Bio-Based Polyamide 510 Salt
Two monomers of 1,5-pentanediamine and bio-sebacic acid were used to replace petroleum-based monomer,and anhydrous ethanol or deoxygenated water were selected as salt-forming solvents to prepare whole-biological polyamide 510(PA510)salt.The PA510 salt prepared by the two solvents was tested and compared respectively.The chemical structure of PA510 salt was characterized by FT-IR and 1H-NMR.The residual content of bio-sebacic acid was analyzed by X-ray diffraction.The melting temperature and thermal decomposition behavior of PA510 salt were analyzed by differential scanning calorimetry,thermogravimetric analysis and polarizing microscope to determine the prepolymerization temperature range of PA510 salt.The PA510 salt prepared with the two solvents was configured into a salt-water solution with a concentration of 50％.The PA510 polymer was prepared under the same pH value and synthetic conditions,and the relative viscosity and end group titration of the polymerization products were tested.The results show that the chemical structure of PA510 salt prepared with two solvents is consistent.The melting point is 137 ℃,and the condensation reaction of the two salts can begin at about 150 ℃.Through the same polymerization process,two kinds of PA510 salts can prepare polymer PA510 with similar relative viscosity.Therefore,deoxygenated water is selected as salt-forming solvent.
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