corrosion makes huge economic and ecologic damage all over the world. biologic corrosion of sewer pipes is considered as a serious limitation in economic perspectives. to prevent biologic corrosive damage, lining techniques can be applied by materials and aggregate resistant to attack bacterially in sewer pipes. the role of bacteria is that they convert sulfur compounds into sulfuric acid which...

Achieving a unique combination of stiffness, strength, extensibility, and toughness in sol-cast poly(urethane–urea) (PU) copolymer films is challenge since these properties are—in general—mutuall...

Two new urethane-based acrylates (UAA and PEG-UAA) were synthesized as polymer blocks. The chemical composition of the two monomers was confirmed by IR and NMR. After cross-linking these blockers by radical polymerization, "hexamethylene PU" [poly(hexamethylene-urethane)] and "PEG-hexamethylene PU" [PEG-poly(hexa-methylene-urethane)] were obtained. The platelet adhesion and platelet activation ...

Bi-layered scaffolds with a 0°/90° lay-down pattern were prepared by melt-extrusion additive manufacturing (AM) using a poly(ester urethane) (PU) synthesized from poly(ε-caprolactone) diol, 1,4-butandiisocyanate and l-lysine ethyl ester dihydrochloride chain extender. Rheological analysis and differential scanning calorimetry of the starting material showed that compression moulded PU films wer...

Recently initiated studies concerning surfacemodifications of poly(dimethylsiloxanes) usingmicrowave plasmonswere extended to polyurethane (PU) surfaces. However,when the same experimental conditions used in the closed and open flowmicrowave plasma reactorswere applied, no chemical bonding of imidazole molecules to PU surfaces was detected. In order to facilitate the imidazole-urethane surface ...

Poly (ether) urethane close/open cell (PEUCC/PEUOC) has been prepared by using in situ polymerization approach. The third-order optical nonlinearities of dissolved samples in DMF were characterized by Z-scan technique at the measurement wavelength of 532 nm. The synthesized samples were also examined by optical microscopy and UV-Vis absorption spectroscopy. The nonlinear refractive (NLR) indice...

Waterborne isocyanate-free grafted poly(hydroxy urethane)-poly(butyl methacrylate) hybrid dispersions were synthesized by miniemulsion polymerization. Grafting was induced including methacrylate functionalities in the urethane) and controlled degree of functionalization. It is shown that grafting enabled a fine tuning mechanical properties PHU containing hybrids.

Over 359 million tons of plastics were produced worldwide in 2018, with significant growth expected the near future, resulting global challenge end-of-life management. The recent identification enzymes that degrade previously considered non-biodegradable opens up opportunities to steer plastic recycling industry into realm biotechnology. Here, sequential conversion post-consumer polyethylene te...

Water borne polyurethane (PU) based on newly prepared hyperbranched poly (amine-ester) (HBPAE) was applied and evaluated as organic coating material. HBPAE was prepared through one-pot synthesis between trimethylol propane as a core and AB2 branched monomer which was obtained via Michal addition of methyl methacrylate (MMA) and diethanol amine (DEA). PU was prepared from HBPAE using different r...

Abstract Mixtures of polyadipate 1,4-butanediol polyol and different small amounts (0.01–0.10 wt%) graphene oxide (GO) were added during the synthesis waterborne polyurethane urea dispersions (PUDs) carried out with acetone method. The addition 0.02–0.04 wt% GO increased T-peel strength plasticized poly (vinyl chloride)/PUD/plasticized chloride) joints whereas 0.05–0.10 wt% single lap-shear sta...