Series of different linkage form siloxane-modified polyurethane (PDMSPU) were synthesized based on isophorone diisocyanate (IPDI), double-side each containing a hydroxyl alkyl polydimethylsiloxane(PDMS), as well as single-ended with two hydroxyl alkyl PDMS as the soft segment, poly caprolactone (PCL) as mixed soft segment. The effects of linkage form of PDMS unit on surface properties were investigated by water contact angle (CA), contact angle hysteresis (CAH), as well as XPS. CA results show that both the two linkage form PDMS can make surface modification of polyurethane by adding a small amount of siloxane(about15% mass fraction). For branch-type copolymers, as the PDMS chain located on the side chain, segmental mobility of PDMS chains may get stronger, as a result, more PDMS chain would move to the surface and dominate the interface. For the segmented-type copolymer, of which both ends were fixed block in the main chain, the surface reorganization is difficult to occur, thus the CAH is not obvious. In contrary, PDMS locates in the side chain of branch-type copolymer; it is prone for the surface to be reorganized, making part of the hard segment polar hydrophilic polyurethane exposed to the surface, so the CAH is more obvious.
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