The Structure of PU/PNIPAAm Semi-IPN Prepared by Wet Phase Inversion Process

Abstract:

N-isopropylacrylamide(NIPAAm) was dispersed in polyurethane(PU) solution and crosslinked with N,N’-methylene bisacrylamide(BIS) to form a semi-interpenetrating polymer networks. The synthesized solution was casted into water bathes with and without 0.25M sodium chloride to get a microporous film by wet phase inversion process. The ratios of BIS amount to N-isopropylacrylamide were varied. The structure and properties of polyurethane/ poly(N-isopropylacrylamide) (PU/PNIPAAm) composite film were characterized by differential scanning calorimetry (DSC) and scanning electron microscope (SEM). The swelling behavior of PU/PNIPPAm composite films was evaluated. The results showed that the addition of sodium chloride lower the LCST of PNIPAAm and the PU/PNIPAAm composite films exhibit temperature sensitivity under swollen conditions.

• Periodical: Advanced Materials Research (Volumes 152-153)
• Pages: 1801-1804
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.152-153.1801
• Online since: October 2010
• Authors: Yuan Xue, Hai Ning Lv
• Keywords: Microporous, N-Isopropylacrylamide, Polyurethane (PU), Swelling, Wet Phase Inversion

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