title: Patterned hydrophilization of nanoporous 1,2-PB by thiol-ene photochemistry.
abstract: We present an efficient method for functionalizing the large polymer-air interface of a gyroid nanoporous polymer. The hydrophilicity of nanoporous cross-linked 1,2-polybutadiene is tuned by thiol-ene photo-grafting of mercaptosuccinic acid or sodium 2-mercaptoethanesulfonate. The reaction is monitored by FT-IR, UV-Vis, contact angle, and gravimetry. Overall quantum yields are calculated for the two thiol-ene "click" reactions in nano-confinement, neatly revealing their chain-like nature. Top-down photolithographic patterning is demonstrated, realizing hydrophilic nanoporous "corridors" exclusively hosting water. The presented approach can be relevant for many applications where, e.g., high control and contrast in hydrophilicity, chemical functionality or refractive index are needed.
authors.affiliation: Department of Micro and Nanotechnology, Technical University of Denmark, Produktionstorvet 423, 2800 Kgs. Lyngby, Denmark.
authors.forename: Anton
authors.initials: A
authors.lastname: Berthold
authors.forename: Kaushal
authors.initials: K
authors.lastname: Sagar
authors.forename: Sokol
authors.initials: S
authors.lastname: Ndoni
mesh_terms: D002070:Butadienes / Q000737:chemistry*; D020724:Elastomers / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D053758:Nanoparticles / Q000737:chemistry*; D010777:Photochemistry; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D013438:Sulfhydryl Compounds / Q000737:chemistry*
chemical_list: D002070:Butadienes; D020724:Elastomers; D011108:Polymers; D013438:Sulfhydryl Compounds; C028834:polybutadiene