| 초록 |
A thermoset elastomer system using renewable poly(carvomenthide) (PCM) derived from plant-based materials and having superb mechanical properties was designed. The hydroxyl terminated PCM polyols having controlled molar masses were synthesized through ring-opening transesterification polymerization (ROTEP) of CM with Sn(Oct)2. Subsequently, dicarboxy end-functionalized PCM prepolymers to produce cured elastomers with no crystallinity, high viscosity, strong thermal resistance, and low glass transition temperature were prepared through esterification using succinic anhydride. Nuclear magnetic resonance (NMR) spectroscopy confirmed well-deined polymer structures, and size exclusion chromatography (SEC) showed narrow molar mass distributions. We also reported a one-pot, two-step method for the synthesis of carboxy-telechelic polyester. Using trifunctional aziridine, three carboxy-telechelic PCM prepolymers having varied molar masses were thermally cross-linked to give three-dimensional network polyester elastomers. All polymers including polyols, prepolymers, and elastomers exhibited high thermal resistance. Dynamic mechanical analysis (DMA) of XL-PCM samples demonstrated the viscoelastic properties of the XL-PCM biomaterials. Tensile experiments demonstrated rubbery behaviors with exceptional elongation at break, tensile strength, and recovery under static or cyclic load. The cell adherence of the rubbers also proved cytocompatibility. These results offer useful approaches for the molecular design and synthesis of engineering thermoset elastomers and related materials including tissue engineering scaffolds. |
