Abstract A UV photoinduced cross-linking of non-modified commercial poly(disulfide) resins (Thioplast) is reported via the air oxidative photocoupling of terminal thiol functions. Catalyzed by a photogenerated guanidine base (TBD), this step-growth photopolymerization is useful to maximize disulfide functions content. The mechanism proceeds through thiol deprotonation into thiolate anions, further oxidized into thiyl radicals, eventually dimerizing into disulfide cross-links. Starting with a detailed structural characterization of … Continue reading Oxidative photopolymerization of thiol-terminated polysulfide resins. Application in antibacterial coatings

Abstract In order to eliminate some problems of organic photoinitiators, self-photoinitiated oligomers of water-diluted polyurethane acrylate grafted with 0.1–0.3 wt.% zinc oxide (ZnO) were prepared. ZnO was first facilely treated by vacuum dehydration and sonication, and then reacted into the oligomers by NCO and OH groups. The oligomers were synthesized using toluene diisocyanate, polyether diols, 2, 2-dimethylol propionic acid, hydroxyl propyl acrylate, pentaerythritol triacrylate, ZnO, and triethylamine. The … Continue reading Self-photoinitiated oligomers of water-diluted polyurethane acrylate grafted with zinc oxide of low concentrations

Abrasion resistant UV-curable coatings were prepared by mixing an aliphatic urethane diacrylate and different reactive diluents with the aim to bring into light the influence of monomer backbone and functionality on thermomechanical properties and more specifically on abrasion resistance. Therefore, the interdependence between physical damages (abrasion and corresponding haze value) and structural characterization (conversion, crosslink density and glass transition temperature) was discussed, pointing out some … Continue reading Effect of reactive monomers on polymer structure and abrasion resistance of UV cured thin films

In this work, lignin based epoxy acrylate (LBEA) oligomer with various percentage of lignin was in situ synthesized with epoxy and acrylic acid. The first step was the etherification between lignin and epoxy to produce lignin based epoxy (LBE), and the second step was the esterification between LBE and acrylic acid to synthesize LBEA. Epoxy value and acid value were measured to determine the reaction … Continue reading Performance of UV curable lignin based epoxy acrylate coatings

The UV-curable urethane acrylate oligomers modified with cycloaliphatic epoxide resin, including polyether-modified cycloaliphatic polyurethane acrylate (CE-MP-UA) and oleic acid-modified cycloaliphatic polyurethane acrylate (CE-OA-UA), have successfully been synthesized and characterized by 1HNMR and FTIR. The kinetics of the synthesis processes are studied in this paper. The effects of the molecular structure of the oligomers on the properties of cured film, including pencil hardness, impact resistance, adhesion and … Continue reading Preparation and characterization of UV-curable urethane acrylate oligomers modified with cycloaliphatic epoxide resin

Polyethylene terephthalate (PET) waste recycling has become a worldwide research interest for industries and academic institutes due its inevitable environmental impact. The main objective of current research work is to target efficient recycling of PET waste from mineral water bottles by the glycolysis method and subsequent use of the recycled product for value-added coating application. In the present study, we report on MP-diol (2-methyl-1,3-propanediol) which … Continue reading Glycolytic depolymerization of PET waste using MP-diol and utilization of recycled product for UV-curable wood coating

A series of UV-curable flexible hyperbranched polyurethane acrylate (F-HBPUA) with various generation numbers and soft chains are successfully developed by modifying different generations of hydroxyl terminated hyperbranched polyurethane (HBPU-OH) with diverse soft chains contained semiadduct urethane monoacrylate. The influence of generation number and soft chain on the performances of F-HBPUA and its UV-cured freestanding film is studied. The degree of branching of F-HBPUA from the … Continue reading Effect of soft chain length and generation number on properties of flexible hyperbranched polyurethane acrylate and its UV-cured film