Abstract
Aramid-silicone resins (PASs) consisting of aromatic polyamide (aramid) and poly (dimethyl-siloxane) (PDMS) segments were synthesized by low temperature solution polycondensation. Using 3-bis(3-aminopropyl)-1,1,3,3-tetramethyl-disiloxane (BATS) instead of PDMS, disiloxane-aramid multiblock copolymers (2SiPASs) were obtained. PAS and 2SiPAS films were prepared by casting from 10 wt% N,N’-dimethylacetamide solution. Ultrathin films of PAS were afforded by the methods of water casting and spin coating. The surface properties of the films were investigated in detail by means of contact angle measurements, electron probe micro analysis (EPMA), and X-ray photoelectron spectroscopy (XPS). The results suggested that PDMS segments were condensed at the outermost surface of PAS films, though this phenomenon was affected by the molding method especially the solvent evaporation conditions. For the evaluation of blood compatibility in vitro, the thromboxane B2(TXB2) release test from platelets attaching to PAS and Biomer®, and the observation of the platelet adhesion or the surface of PAS by scanning electtron microscopy (SEM) were carried out. PAS was found to be bio-inert in vitro. The gas permeation properties and dynamic thermomechanical properties of the PAS films were also investigated. PAS containing ≥ 53 wt% of PDMS showed high enough oxygen permeability compared with conventional silicone rubbers.
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