5 research outputs found
Imaging of Mechanical Properties of Soft Matter. From Heterogeneous Polymer Surfaces to Single Biomolecules
Derecho al aborto. Posibles conflictos con derechos constitucionales
El presente trabajo trata acerca del derecho al aborto. Se analiza la progresi贸n de la regulaci贸n en Espa帽a desde la despenalizaci贸n del mismo, asi como sus posibles conflictos con derechos constitucionales. Tambi茅n se trata la postura del TC acerca del aborto a trav茅s del an谩lisis de algunas de las sentencias mas importantes sobre el tema, y un breve inciso de la regulaci贸n a nivel internacional.<br /
Investigating washback : a case study using student diaries
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Enhanced stability of low fouling zwitterionic polymer brushes in seawater with diblock architecture
The successful implementation of zwitterionic polymeric brushes as antifouling materials for marine applications is conditioned by the stability of the polymer chain and the brush-anchoring segment in seawater. Here we demonstrate that robust, antifouling, hydrophilic polysulfobetaine-based brushes with diblock architecture can be fabricated by atom-transfer radical polymerization (ATRP) using initiator-modified surfaces. Sequential living-type polymerization of hydrophobic styrene or methyl methacrylate and commercially available hydrophilic sulfobetaine methacrylamide (SBMAm) monomer is employed. Stability enhancement is accomplished by protecting the siloxane anchoring bond of brushes on the substrate, grafted from silicon oxide surfaces. The degradation of unprotected PSBMAm brushes is clearly evident after a 3 month immersion challenge in sterilized artificial seawater. Ellipsometry and atomic force microscopy (AFM) measurements are used to follow changes in coating thickness and surface morphology. Comparative stability results indicate that surface-tethered poly(methyl methacrylate) and polystyrene hydrophobic blocks substantially improve the stability of zwitterionic brushes in an artificial marine environment. In addition, differences between the hydration of zwitterionic brushes in fresh and salt water are discussed to provide a better understanding of hydration and degradation processes with the benefit of improved design of polyzwitterionic coating