A survey is given on the various options to seal water ingress from strata and from concrete structures by injecting different types of resins showing the scope and limits of the individual grouts. The report covers methacrylates and polyurethane hydrogels, one and two component polyurethane resins as well as silicate isocyanate resins. The use of fast reacting two component polyurethane resins...

      In order to prepare polyurethane elastomers with acceptable physical properties and good biocompatibility, novel polyurethane networks were synthesized via curing reaction of epoxy-terminated polyurethane prepolymers (EUPs) with hexamethylene diamine. EUPs were prepared from reaction of glycidol with NCO-terminated polyurethanes (ITPs). ITPs were also synthesized from reaction of one equi...

The adsorption/desorption behavior of the cationic surfactant tetradecyl trimethyl ammonium chloride (TTAC) at the alumina-water interface and the change in the structure of surfactant aggregates at the interface were studied using the fluorescence spectroscopic technique along with electrophoresis. As expected, the cationic TTAC adsorbed significantly on the negatively charged alumina particle...

Abstract The large amounts of polyurethane foam wastes (PUFWs) produced in the automobiles, buildings, and furniture industries cause many environmental problems. Therefore, recycling PUFWs has acquired great interest worldwide. In this study, were converted to new nanocomposite. chemical modification was conducted through reflux with potassium permanganate 0.1 M H 2 SO 4 . PUF-COO@MnO nanocomp...

In this study the properties of poly(D,L-lactide-co-glycolide) (PLGA) dispersions containing a thermoresponsive cationic copolymer were investigated. The PLGA dispersions were prepared by interfacial deposition in aqueous solution and were rendered thermoresponsive by addition of a cationic poly(N-isopropyl acrylamide) (PNIPAm) graft copolymer. The copolymers used had the general composition PD...

The Binding behavior of acidic capsular polysaccharide (SPS), isolated from Klebsiella serotype K43 with oppositely charged dyes and surfactants have been studied by absorbance and emission spectroscopic studies. Each repeating unit of the SPS consists of three D-mannose, one D-galactose and one D-glucuronic acid residue. The anionic polymer exhibited chromtropic character and induced strong me...

Waterborne polyurethane (WPU) dispersions were prepared for flame retardant coatings. Specifically, alkoxysilane-capped polycaprolactone-based WPUs synthesized employing the acetone process, and Casein, as a green sustainable additive, was added by two different methods (in situ ex situ). These strategies made possible to evaluate effect of Polyurethane/Casein interaction in final properties fi...

Field robots are widely used to accomplish a variety of tasks in many different fields. However, setting of the locomotive ability of these robots at the design phase may prevent the traversal of unknown rough terrain. To address this shortcoming of existing robots, we designed a robot that is able to modify its environment by using polyurethane foam to construct auxiliary structures to facilit...