13,251 research outputs found
Scratch Resistance Enhancement of Polymer Coatings
No full textThis review presents the state of the art regarding the improvement of scratch resistance of polymeric coatings. In particular, our attention is focused on the effect of inorganic nano- metric fillers on the scratch resistance of organic coatings. Two main strategies are described for the achievement of such nanostructured hybrid organic/inorganic coatings: either a top- down or a bottom-up approach
Recent Advances in Cationic Photopolymerization
No full textThe paper reports important strategies to overcome limitation of cationic photopolymerization. First, it was possible to run emulsion cationic photopolymerization in water, taking the advantages of hydrophobic droplets of suitable dimension to avoid termination reaction, achieving capsules of about 200 nm. Subsequently a frontal polymerization reaction is used to promote the UV-induced crosslinking process of an epoxy composites via a radical induced cationic frontal polymerization
Visible Light Induced Cationic Polymerization of Epoxides by Using Multiwalled Carbon Nanotubes
No full textThe visible light induced cationic polymerization of epoxides can be achieved by means of multiwalled carbon nanotubes (MWCNTs), which act as visible light photoinitiators via a radical-induced cationic photopolymerization process. When MWCNTs are irradiated with longer wavelengths (above 400 nm), they generate carbon radicals, by means of hydrogen abstraction from the epoxy monomer; these radicals are oxidized in the presence of iodonium salt to a carbocation that is sufficiently reactive to start the cationic ring-opening polymerization of an epoxy monomer. These mechanisms have been supported by electron paramagnetic resonance analysis.Fil: Sangermano, Marco. Politecnico di Torino; ItaliaFil: Rodriguez, Damian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Gonzalez, Monica Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Laurenti, Enzo. Università di Torino; ItaliaFil: Yagci, Yusuf. Istanbul Technical University; Turquí
Organic–Inorganic Hybrid Coatings with Enhanced Scratch Resistance Properties Obtained by the Sol–Gel Process
No full textState of the art of organic–inorganic hybrid coatings with enhanced scratch resistance properties obtained by the sol–gel proces
In situ synthesis of Ag-acrylic nanocomposites: tomography-based percolation model, irreversible photoinduced electromigration and reversible electromigration
No full text
Surface modification of UV Cured epoxy resins by click Chemistry
No full textA novel method for surface modification of UV-cured epoxy network was described. Photoinitiated cationic copolymerization of a bisepoxide, namely 3,4-epoxy cyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (EEC) with epibromohydrine (EBH) by using a cationic photoinitiator, [4-(2-methylpropyl)phenyl]4-methylphenyl-iodonium hexafluorophosphate, in propylene carbonate solution was studied. The real-time Fourier transform infrared spectroscopic, gel content determination and thermal characterization studies revealed that both EEC and EBH monomers take part in the polymerization and epoxy network possessing bromomethyl functional groups was obtained. The bromine functions of the cured product formed on the glass surface were converted to azide functionalities with sodium azide. Independently prepared alkyne functional poly(ethylene glycol) (PEG) was subsequently anchored to azide-modified epoxy surface by a "click" reaction. Surface modification of the network through incorporation of hydrophilic PEG chain was evidenced by contact angle measurements. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2862-2868, 201
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