Matt polyurethane coating was successfully prepared through the synergistic effect of castor oil and phenolic epoxy resin into backbone. The formation mechanism may be ascribed to modulus mismatch between partially modified unmodified polyurethane. Scanning electron microscopy (SEM) used observe micro-rough surface morphologies. Atomic force (AFM) three-dimensional (3D) profilometer were applied calculate a series roughness parameters in different dimensions, such as Sa, Sq, Sp, Sv, Sz, Sku,...

Bio-based antismudge coating, as a substitute for the petroleum-based one, has excellent liquid repellency and self-cleaning ability, which is of great value to keep coated surface free contaminants. In this study, we report facile strategy fabricate high-performance biobased hyperbranched polyurethane coatings. More specifically, castor oil-based polyol was employed coating precursor, hexamethylene diisocyanate trimer used curing agent, mono-hydroxyl-terminated poly(dimethysiloxane)...

Abstract Fabrication and performance of the castor oil (CO)‐based hyperbranched acrylate (C20AA) UV‐curable coatings are highlighted in this work. Herein, C20AA was obtained through a facile reaction oil‐based polyol (C20) with acrylic acid. FT‐IR 1 H NMR spectra confirmed synthesis target C20AA. Subsequently, as‐prepared employed for crosslinking commercialized linear polyurethane (PUA) oligomer. Specifically, by varying content over range 0, 20, 40, 60 wt%, series were prepared coded as...

Castor oil (CO) based hyperbranched urethane acrylates (HBUAs), namely C10-IH and C20-IH, were synthesized by modifying the hydroxyl groups of first (C10)- second (C20)-generation CO-based polyesters with isocyanate-bearing semi-adducts (IPDI-HEA). Herein, C10 C20 prepared using renewable CO as a B3 core molecule dimethylolpropionic acid an AB2 monomer via pseudo-one-pot condensation procedure. For comparison, acrylate (CO-IH) was directly IPDI-HEA. The structure-property relationship...

Abstract Acrylate grouting (AG) material is a low‐viscosity aqueous solution capable of forming an elastic water‐plugging gel after being injected into seepage cracks. This study highlights the fabrication and performance AG materials, specifically emphasizing use magnesium acrylate (MgDA) as principal precursor for polymer network. Additionally, 2‐(dimethylamino)ethyl methacrylate (DMAEMA) serves bifunction crosslinker accelerator, while sodium persulfate potassium ferricyanide act...

Abstract A concise and efficient protocol for ortho‐C−H alkoxylation of benzamides was developed via Co(II)‐catalyzed cross‐dehydrogenative coupling (CDC) reaction with alcohols. The employs a Ag 2 O oxidant, NaOAc base alcohols solvent required as the source under N2 atmosphere. method shows excellent functional group tolerance highly regioselectivity, which provides facile pathway ortho‐alkoxylation benzamides.

Abstract In this work, a vegetable oil‐based polyol (ERD) with high hydroxyl value was obtained from ring‐opening reaction between the renewable epoxidized soybean oil and ricinoleic acid, further esterified 2,2‐bis(hydroxymethyl)propionic acid. To achieve anti‐smudge coating, ERD utilized as component, hexamethylene diisocyanate trimer employed curing agent, mono‐hydroxy‐terminated polydimethylsiloxane (PDMS‐OH) introduced low surface energy component. consequence, biobased polyurethane...

Abstract An efficient and facile protocol concerning Cu(II)‐catalyzed methylthiolation of 8‐aminoquinoline amides under air atmosphere with widely available DMSO as the terminal thiomethyl source has been developed. The reaction exhibits excellent functional group tolerance highly regioselectivity, which provides an attractive approach for aryl methyl thioethers preparation.

In order to explore the problems of load transfer and anchorage mechanisms tensile anchors under pull-out for geotechnical anchoring systems, a step-wise mathematical model is established which considers linear–nonlinear shear stress displacement segment, using an elasto-plastic constitutive model. The displacement, axial force, interface in different stages (elastic, plastic, debonding) are analyzed solutions derived. And theoretical ultimate anchor at each stage also presented. Two situ...

Copper catalyzed chemoselective cleavage of the C(CO)-C(alkyl) bond leading to C-N formation with chelation assistance N-containing directing groups is described. Inexpensive Cu(ii)-acetate serves as a convenient catalyst for this transformation. This method highlights emerging strategy transform unactivated alkyl ketones into amides in organic synthesis and provides new C-C cleavage.

A novel and convenient one-pot route for the synthesis of 3-benzyl-2-phenylquinolin-4(1 H)-ones has been developed under transition-metal-free conditions. This new strategy features high yield good functional group tolerance. In addition, a proposed mechanism confirmed this reaction.

Abstract Herein, crosslinked polycarboxylate superplasticizers were synthesized using acrylic acid, sodium methylallyl sulfonate and methyl polyethylene glycol acrylate as monomers, monomers that contain either ester or amide groups crosslinking agents. The from the ester‐ amide‐based agents respectively denoted SP‐E SP‐N. In addition, a series of performance characterizations carried out to explore influence different functional in on superplasticizers. Fluidity test results showed...

Abstract A novel cobalt and copper co‐catalyzed for exclusive synthesis of 1,3,4‐trisubstituted pyrazoles via a one‐pot reaction hydrazones with nitromethane aldehydes has been reported. Proper conditions without additional oxidants, broad substrate scope easily obtained starting materials make this protocol promising practical.

Abstract A groups of cross-linked waterborne polyurethane (CPU) coatings were successfully synthesized and characterized. The CPU emulsions could achieve low gloss effect without addition any matting agents by the formation self-roughed surface. Rheological research shows that comply with Herschel-bulkley pseudoplastic fluid model a yield stress, exhibited same behaviors as gel. SEM AFM illustrated rough surface morphology films, series roughness parameters calculated. In general, resulted...

Abstract A new strategy for the synthesis of 3‐phenylquinoline through annulation azides with aldehydes has been established. The transformation was accomplished by palladium‐catalyzed C−H functionalization and C−C bond cleavage to form two bonds one C−N in one‐pot manner. This reaction system a relatively broad scope, providing facile pathway 3‐phenyl‐quinoline.