Preparation of Polyurethane and Its Influence on the Properties of Epoxy System
Keywords:
Epoxy resin, Polyurethane, Toughening, Mechanical propertiesAbstract
To improve the toughness of epoxy resin curing system, a hydroxyl-terminated polyurethane (HTPU) toughener was synthesized from polyethylene glycol (PEG) and isophorone diisocyanate (IPDI), and its chemical structure was confirmed by FTIR and H-NMR. The toughener was added to bisphenol A epoxy resin/anhydride system with different mass fractions, and the thermomechanical properties and mechanical properties of the composites were systematically studied. The results show that: with the increase of the addition amount of HTPU toughener, the shear strength and elongation at break of the composites are both significantly improved. When the addition amount is 30%, the elongation at break can be increased by 275% and the shear strength is increased by 49.7%, indicating that its toughness and anti-cracking performance are effectively improved; at the same time, the tensile strength, storage modulus and glass transition temperature Tg all show a controllable decrease. The evolution law of this macroscopic property is due to the chemical bonding of the flexible long-chain of PU in the epoxy network, successfully constructing a rigid-flexible phase separation structure.
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