Synthesis of Novel Non-Isocyanate Polyurethane/Functionalized Boron Nitride Composites

Abstract

Poly(hydroxyurethanes) (PHUs) have been suggested as isocyanate-free, low-toxicity alternatives to polyurethanes (PUs). However, PHUs present low mechanical properties due to the presence of side reactions that limit the production of high-molar mass polymers. Here, we present the synthesis under mild conditions and atmospheric pressure of bi-cyclic carbonate monomer for the production of PHU nanocomposites with good physical properties. The kinetics of the bi-cyclic carbonate synthesis and its complete conversion to urethane were followed by FTIR. The addition of functionalized boron nitrate (f-BN) with sucrose crystals improved the thermal degradation temperature as well as the glass transition by approximately 20 °C and 10 °C, respectively. The storage modulus of PHU films gradually increases with the concentration of f-BN in the composite.

Examining the Water–Polymer Interactions in Non-Isocyanate Polyurethane/Polyhedral Oligomeric Silsesquioxane Hybrid Hydrogels

“…Generally, the physical blending of POSS in a polymer matrix is associated with partial agglomeration of POSS since there is a high surface free energy and a high affinity of nanoparticles [35][36][37]. As the modification of polyurethanes leads to advantageous results, the impact o different types of additives on the properties of NIPUs has been studied [15][16][17][18][19], includin polyhedral oligomeric silsesquioxanes (POSS) [20][21][22][23][24]. POSS consists of a group of hybrid (organic/inorganic) molecules that are characterized by a well-defined silica cage core tha is usually functionalized by reactive or non-reactive substituents (Figure 2) [25].…”

“…Recent studies on NIPU modification with POSS focus mainly on systems wher POSS is introduced covalently into the polymer chain [3,[20][21][22][23][24][43][44][45][46][47][48][49]. The impact o chemically incorporated POSS in such systems on mechanical and thermal properties ha As the modification of polyurethanes leads to advantageous results, the impact of different types of additives on the properties of NIPUs has been studied [15][16][17][18][19], including polyhedral oligomeric silsesquioxanes (POSS) [20][21][22][23][24]. POSS consists of a group of hybrid (organic/inorganic) molecules that are characterized by a well-defined silica cage core that is usually functionalized by reactive or non-reactive substituents (Figure 2) [25].…”

“…As the modification of polyurethanes leads to advantageous results, the impact of different types of additives on the properties of NIPUs has been studied [ 15 , 16 , 17 , 18 , 19 ], including polyhedral oligomeric silsesquioxanes (POSS) [ 20 , 21 , 22 , 23 , 24 ]. POSS consists of a group of hybrid (organic/inorganic) molecules that are characterized by a well-defined silica cage core that is usually functionalized by reactive or non-reactive substituents ( Figure 2 ) [ 25 ].…”

Synthesis and Characterization of Cardanol-Based Non-Isocyanate Polyurethane

“…It is well known that the traditional polyurethane (PU) is usually synthesized from toxic isocyanate and polyol. Therefore, due to concerns about energy and health issues, strategies for developing green and sustainable biomass resources instead of isocyanate to prepare non-isocyanate polyurethane have important scientific significance and application value [ 1 , 2 , 3 ]. Non-isocyanate polyurethane made from renewable resources is referred to as bio-based polyurethane.…”