Synthesis of porous polyurea microspheres for matting coating

Carbon and Oxygen-Doped Phosphorus Nitride (COPN) for Continuous Selective and Stable H2O2 Production

“…During this CVD-like process, 41 the oblate sphere-shaped PVP-K30 (Figure S2a,b) located near the inlet vaporized and acted as a pore-forming agent. 42 Concurrently, the irregular rod-shaped MP (Figure S2c,d) near the air outlet acted as a morphology template, contributing as a source of C, O, N, and P for the synthesis of COPN-X materials (for detailed synthesis procedures for COPN-X, see Supporting Information: Synthesis of COPN-X). Reference samples labeled as MP-X were prepared without the use of PVP-K30 at various temperatures (400 to 800 °C) during the pyrolysis process (for a detailed synthesis procedure, see Supporting Information, synthesis of MP-X).…”

“…Subsequently, the reactants underwent pyrolysis at various temperatures between 400 and 800 °C and yielded their corresponding COPN- X ( X = 1–5) materials (see Figure S1 for their corresponding appearance). During this CVD-like process, the oblate sphere-shaped PVP-K30 (Figure S2a,b) located near the inlet vaporized and acted as a pore-forming agent . Concurrently, the irregular rod-shaped MP (Figure S2c,d) near the air outlet acted as a morphology template, contributing as a source of C, O, N, and P for the synthesis of COPN- X materials (for detailed synthesis procedures for COPN- X , see Supporting Information: Synthesis of COPN- X ).…”

A crosslinked waterborne poly(urethane‐urea) oligomer enables mechanically strong waterborne polyacrylate–poly(urethane‐urea) hybrid films with superior film‐forming ability

“…23 While the urea linkage is synthesized by the reaction of polyisocyanate with amino compounds at room temperature. 24 The reactivity of isocyanate groups toward water and hydroxyl groups is similar, whereas their reactivity toward amine groups from 200 up to 1000 times faster when it comes to aliphatic amines, and from 2 to 3 times faster in the case of aromatic amines. 25,26 With regard to diisocyanates, aliphatic isophorone diisocyanate (IPDI) is the most commonly used in the synthesis of waterborne dispersions due to its lower reactivity with water compared to aromatic ones, which allows a better control of the synthesis procedure.…”

“…The urethane linkage in WPU is usually prepared by the reaction of polyisocyanate with polymer polyol and diol 23 . While the urea linkage is synthesized by the reaction of polyisocyanate with amino compounds at room temperature 24 . The reactivity of isocyanate groups toward water and hydroxyl groups is similar, whereas their reactivity toward amine groups from 200 up to 1000 times faster when it comes to aliphatic amines, and from 2 to 3 times faster in the case of aromatic amines 25,26 …”