Efficiently preparation and characterization of bio-based high temperature resistant PA5T/56
At present,the main production method of high temperature resistant nylon(PA)is"pre-polymerization+solid state polymerization"method,however,the technical problems such as long preparation cycle and many side reactions in the solid state polymerization process can not be effectively solved for a long time.Bio-based high temperature resistant PA5T/56 was efficiently prepared by adding appropriate amount of water in the early stage of solid state polymerization with pentaenediamine(PDA),tere-phthalic acid(TPA)and adipic acid(AA)as raw materials.The effect of the molar ratio of TPA to AA on the melting point of the product was studied.The results show that the melting point of the product(P64)is 309℃ when the ratio is 6∶4,which can be used as high temperature resistant engineering plastics.The effects of water consumption,reaction temperature,holding time and particle size of prepolymer on the relative viscosity of solid state polymerization were investigated.The optimized process conditions were determined as water consumption to equipment volume ratio of 1∶300,reaction temperature of 260℃,holding time of 6 h and parti-cle size of prepolymer<0.1 mm.The molecular structure of the product was confirmed by Fourier transform infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy.The thermal performance test results show that the melting point of P64 is 309℃,and the initial thermal decomposition temperature is 375℃,indicating the sample has a wide temperature processing range and a good melting processing temperature window.The mechanical properties test results show that the tensile strength of P64 is 85.7 Mpa,the elongation at break is 15.4%,and the notch impact strength is 5.56 kJ/m2,which is similar to the properties of commer-cial PA6T copolymer,which means that the sample can partially replace the PA6T copolymer and expand the application field.
high temperature resistant nylonbio-based polyamide 5T/56polymerization processprepolymerization+solid state polymerizationstructure and property
NETL
NSTL
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