Polyurethane surface grafting

Figure 9. Adsorption of I-labeled IgG and adhesion of platelet to polyurethane surface grafted with polyacrylamide.

Jiang Y, Rongbing B, Ling T, Jian S, Sicong L. Blood compatibility of polyurethane surface grafted copolymerization with sulfobetaine monomer. Colloids Surf B Biointerfaces... 

Two general methods of improving polymer hemocompatibility are known (1) grafting of hydrophilic chains, and (2) the chemical attachment of an antiplatelet agent. In this respect, many hydrophilic and other monomers are grafted on solid polyurethane surfaces such as... 

Bio-Functionality of Engineered Polyurethane Surfaces by "H-Bond Grafting"... 

FIG. 20 Variation of the coefficient of static friction (// ) with immersion time in water for a surface-grafted polyurethane film. Contact pressure 0.11 kPa. 

FIG. 22 Variation of the coefficient of kinetic friction (jik) with the sliding velocity for surface-grafted polyurethane films in water. Graft density //xg/cm2 (O) 0, ( ) 140, and (A) 350. 

K. Fujimoto, H. Tadokoro, Y. Ueda, Y. Ikada, Polyurethane surface modification by graft polymerization of acrylamide for reduced protein adsorption and platelet adhesion. Biomaterials 14 (6) (1993) 442-448. 

J.G. Archambault, J.L. Brash, Protein resistant polyurethane surfaces by chemical grafting of PEG amino-terminated PEO as grafting reagent. Colloids Surf. B Biointerfaces 39 (1-2) (2004) 9-16. 

Cao, X., Habibi, Y., Lucia, L.A.J. One-pot polymerization, surface grafting, and processing of waterborne polyurethane-cellulose nanociystal nanocomposites. J. Mater. Chem. 19, 7137-7145 (2009)... 

Chemical functionalization of CNT surfaces could improve their dispersion in the polymer matrix and enhance the nanotube-polymer interfacial interaction and the mechanical load transfer. The effects of nanotube functionalization on the properties of CNT-TPU composites have been investigated in details. Xia and Song have synthesized polycaprolactone polyurethane (PU)-grafted SWNTs (PU-g-SWNTs) and corresponding PU-g-SWNT-PU composites by in-situ polymerization. The results show that PU-g-SWNTs improve the dispersion of SWNTs in the PU matrix and strengthen the interfacial interaction between the PU and SWNTs. Compared with neat PU and pristine SWNT PU composites, PU-g-SWNT-PU composites demonstrate remarkable enhancement on Young s modulus. The Young s modulus of a 0.7 wt /o PU-g-SWNT-PU composite increases by 178% over the blank PU and 88% over the 0.7 wt% pristine SWNT-PU composite, respectively. 

Jung IK, Bae JW, Choi WS, Choi JH, Park KD. Surface graft polymerization of poly(ethylene glycol) methacrylate onto polyurethane via thiol-ene reaction preparation and characterizations. J Biomater Sci Polym Ed 2009 20(10) 1473-82. 

Figure 9.2 Two-step reaction scheme for grafting PEG to the polyurethane surface (R —OH, —NH2, —SO3, etc.).

Freij-Larsson C, Wesslen B. Grafting of polyurethane surfaces with poly(ethylene glycol). JAppl Polym Sci 1993 50 345-52. http //dx.doi.Org/10.1002/app.1993.070500215. 

Chen H, Hu XY, Zhang YX, Li D, Wu ZK, Zhang T. Effect of chain density and conformation on protein adsorption at PEG-grafted polyurethane surfaces. Colloids Surf B Biointerfaces 2008 61 237-43. http //dx.doi.Org/10.1016/j.colsurfb.2007.08.012. 

He C, Wang M, Cai X, Huang X, Li L, Zhu H, et al. Chemically induced graft copolymerization of 2-hydroxyethyl methacrylate onto polyurethane surface for improving blood compatibility. Appl Surf Sci 2011 258(2) 755-60. 

Huang J, Xu W. Zwitterionic monomer graft copolymeiization onto polyurethane surface through a PEG spacer. Appl Surf Sci 2010 256(12) 3921-7. 

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