Abstract
In this study, dimmer-acid-based hybrid nonisocyanate polyurethanes (HNIPUs) were synthesized by the one-step method without catalyst. Three polyamines and two epoxy resins were selected as raw materials for HNIPU, and cyclic carbonate was synthesized based on our previous work. All of the products were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Then, HNIPU coatings were prepared and determined by swelling, water absorption, and water contact angle. The results showed that the HNIPU-4551 have the best mechanical and thermal properties because of its high crosslinking density. Among the different amines, it was confirmed that tetraethylenepentamine was the best amine curing agent for HNIPU coating. Meanwhile, the epoxy resin with a higher epoxy value would also form a higher crosslinking density. Those coatings showed an excellent impact strength, adhesion, flexibility, pencil hardness, hydrophilic, and appropriate crosslinking density.
Highlights
Polyurethanes (PUs) are one of the most popular polymer materials because of their versatile properties
After combining with epoxy resin, the in first step seen in Figures 3 and 4, the Tmax displayed in two steps, one for the degradation of softmax segments, and increased and a narrow distribution appeared, the Tmax in the second step had a little decrease and exhibited a wider distribution, which confirms that epoxy resin can crosslink both with the soft segments and hard segments, leading to a good compatibility of hybrid nonisocyanate polyurethanes (HNIPUs)
Waals force,were andexisted electrostatic interactions were existed between water molecules and residual unreacted influenced by crosslinking density, density of urethane groups, and intermolecular forces, especially the the water absorption of HNIPU wasthe influenced by crosslinking density, secondary groups residual in the HNIPU
Summary
Polyurethanes (PUs) are one of the most popular polymer materials because of their versatile properties. Rana et al added antiplasticizers into the initial the high adhesive strength, good impact resistance and high hardness, epoxy resin is widely used monomer mixture, and formed epoxy-amine thermosetting resins, leading to an improved toughness in modification applications [15]. There is still large room to was characterized and applied to synthesize nonisocyanate polyurethanes (NIPU) because of its improve its thermal and mechanical properties in consideration of application requirement. The dimer acid based its thermal and mechanical properties in consideration of application requirement In this hybrid nonisocyanate polyurethanes was synthesized with several amines and epoxy resins by onestudy, a simple modification method was further proposed. The dimer acid based hybrid nonisocyanate step Their thermal and mechanical properties were compared, and it was confirmed that the polyurethanes was synthesized with several amines and epoxy resins by one-step.
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