Preparation and high temperature accelerated thermal-oxidative aging of fully bio-based PA 510 fiber
Using fully bio-based polyamide 510(PA 510)chips as raw material,PA 510 pre-oriented fibers(POY)were pre-pared by melt spinning at a speed of 3 000 m/min after drying.The fibers were subjected to high-temperature accelerated thermal oxidative aging treatment.The changes in the structure and properties of the fibers were studied before and after thermal oxidative aging treatment.The results showed that the molecular chains of PA 510 fibers broke during thermal oxidation,thus producing the structures of caprolactam,acids,esters,etc.,which caused the fibers to turn yellow and become brittle;the blue yellow val-ue(b∗)of PA 510 fibers gradually increased as the thermal oxidative aging time prolonged at a certain thermal oxidative aging temperature,and the higher the thermal oxidative aging temperature was,the faster the b∗ increased;the melting point of PA 510 fiber decreased from 216℃to 212℃,the relative viscosity decreased from 2.62 to 1.41,the breaking strength de-creased from 3.25 cN/dtex to 0.75 cN/dtex,and the elongation at break decreased from 112%to 5%after 10 min of thermal ox-idative aging at 195℃;and it reached the critical brittleness point when the relative viscosity of PA 510 fiber decreased to 2.34;the relationship between relative viscosity and b∗ was established through time-temperature superposition analysis,hence b∗ can be used to quickly detect the brittleness of the fiber.
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