Progress in Study of Non-Isocyanate Polyurethane

Abstract

Non-isocyanate polyurethane (NIPU) is a novel kind of polyurethane prepared by reaction of cyclo-carbonates and amines without use of toxic isocyanates. NIPU has attracted increasing attention because of its improvements in porosity, water absorption, and thermal and chemical resistance over conventional polyurethanes. Their potential technological applications include chemical-resistant coating, sealants, foam, etc. In this paper, on the basis of a comprehensive survey of the currently available literature on NIPU, we summarize recent progress in NIPU, and mainly discuss the syntheses of cyclo-carbonates oligomers, the reaction mechanism, and the preparation and application of different kinds of NIPU.

DFT investigation of the reaction mechanism for the guanidine catalysed ring-opening of cyclic carbonates by aromatic and alkyl-amines

“…The most frequently studied and promising route relies on the polyaddition of bis-5-membered cyclic carbonates with diamines, leading to the formation of PolyHydroxyUrethanes (PHUs) [1][2][3][4][5][6][7] that are mainly exploited for coating applications or as crosslinked materials for thermosets or elastomers [8][9][10] or as foamed materials.…”

Influence of an oligomer polyol and monomers on the structure and properties of core–shell polyurethane–poly(n‐butyl acrylate‐co‐styrene) hybrid emulsions

“…1 In general, it is imperative that an oligomer polyol molecule contain at least two hydroxyl groups or other hydrogen donors (ANH 2 , ACOOH, ASH, etc.). 2,3 In recent years, oligomer polyols modified from castor oil, rapeseed oil, or soybean oil have been used to improve the PU properties, including the antiabrasion properties, heat resistance, and mechanical behavior. [4][5][6] Common reagents for the preparation of urethane polymers, apart from polyols, include diisocyanates, hydrophilic chain extenders, and end-capping reagents or subsequent chain extenders.…”

Synthesis of UV-curable polycarbonate diols (PCDL)-based polyurethane acrylate for negative photoresist

“…Polyurethane (PU) is widely used in a wide range of applications, due to its superior properties, such as gloss, toughness, flexibility at low temperature, abrasion resistance, excellent mechanical and physical properties and film-forming ability [1][2][3]. The chemical reaction underlying PU synthesis is polyaddition between the hydroxyl group (-OH) of polyol and the isocyanate group (-NCO) [4].…”