Abstract
To regulate the phase structure and improve the chemical resistance of silicon-containing polycarbonate urethanes (SiPCUs), a diol with fluorocarbon side chain was introduced as a second chain extender. The fluorinated silicon-containing polyurethanes (FSiPCUs) displayed stronger hydrogen bonding between carbonate and urethane groups than SiPCUs in attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The glass transition temperatures of the polycarbonate soft segments shifted to higher temperatures determined by thermal analysis. Combined with the results of small angle X-ray scattering (SAXS) and dissipative particle dynamics (DPD), it was proved that the dangling chain could disrupt the undesirable excessive hard segment aggregation caused by the apolar PDMS and promoted the miscibility between hard segments and polycarbonate soft segments. The enhanced segmental interaction provided protection for the vulnerable carbonate groups from chain scission initiated by oxidative media.
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