The Effect of Isomer on the Thermal and Rheological Properties of Poly-(ether-imides)

摘要

Thermal and rheological properties of poly-(ether-imides) with Meta and Para monomer isomer types were investigated using oscillatory rheology and thermal characterization techniques. The poly-(ether-imide) synthesized from Para based isomer showed an improved T_g with superior chemical resistance while still maintaining at least 90% of the flow properties. The observed shift in T_g and minimal differences in shear thinning index were most likely due to differences in entanglement density and relaxation dynamics between the polymers. Additionally, we have attempted to show-case the predictive capabilities of non-linear vs linear rheology in differentiating the structure-property relationship between isomer types