| 초록 |
N-isopropylacrylamide (NIPAM) shows a lower critical solution temperature (LCST) at 32°C in aqueous solution. The thermoresponsive behavior of NIPAM was extensively investigated and modeled by different researchers. In this study, a series of AB crosslinked polymer dispersions have been synthesized from polyurethane (PU) (polymer A) and NIPAM (polymer B). PU was prepared from MDI, HDI, H12MDI, IPDI as diisocyanate, and PEG as polyol. The effect of PU/NIPAM composition, crosslinking agent have been studied in terms of dispersion size, TEM morphology, mechanical, dynamic mechanical properties, differential scanning calorimetry (DSC), in addition to water proof and vapor permeability of cast film. A core(PU)-shell(NIPAM) morphology with very fine dispersion was obtained.
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