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A series of asymmetric polyimide (PI) films were prepared via polycondensation of 2,3,3′,4′-biphenyl-tetracarboxylic acid dianhydride (a-BPDA) with a pair of isomer 4,4′-oxydianiline (4,4′-ODA) and 3,4′-oxydianiline (3,4′-ODA). The effects of isomerism on the thermal stability, mechanical and tribological properties were systematically investigated. When molar fraction of 4,4′-ODA was increased in...
A novel biological friendly shape memory polymer (SMP) based on ethyl cellulose (EC) and polycaprolactone (PCL) was prepared. The network structure of the polymer was formed by linear EC backbones which were linked by grafted PCL chains, and the results showed outstanding mechanical strength and shape memory property of this polymer. The tensile modulus varied from 104.9 to 373.4MPa while the tensile...
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