Damping properties of interpenetrating polymer networks of polyurethane-modified epoxy and polyurethanes

Abstract

ABSTRACT:Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU)-modified epoxy with different molecular weight of polyol and polyurethanes based on the mixture of polydiol and polytriol by a one-shot method. Two types of PU-modified epoxy: PU-crosslinked epoxy and PU-dangled epoxy were synthesized, and the effects of the different molecular weights of polyol in the PU-modified epoxy/PU IPNs on the dynamic mechanical properties, morphology, and damping behavior were investigated. The results show that the damping ability is enhanced through the introduction of PU-modified epoxy into the PU matrix to form the IPN structure. As the molecular weight of polyol in PU-modified epoxy increases, the loss area (LA) of the two types of the IPNs increases. PU-dangled epoxy/PU IPNs exhibit much higher damping property than that of the PU-crosslinked epoxy/PU IPNs with 20 wt % of PUcrosslinked epoxy.

Thermal and mechanical properties of polyurethanes modified with L-ascorbic acid

“…In order to improve the thermal properties of polyurethanes, researchers modify them mostly by incorporating nanoparticles [7,8] and proteins [9] or by changing the amount and type of monomers used for their synthesis [10]. To improve the mechanical properties of polyurethanes, often other polymers are used as modifiers for example epoxy resins [11][12][13][14]. Polyurethanes prepared with the use of suitable raw materials are biocompatible and may be biodegradable-this can be designed dependently on material destination [15,16].…”

Mechanical performance of hybrid thermoset composites: Effects of matrix and reinforcement hybridization

“…Numerous favourable attributes, for example enhanced damping properties [9][10][11][12], have been discovered and extensively analysed. Several kinds of polymer resin pairs were 3 investigated, such as epoxy (EP) with polyurethanes (PU) [9,[13][14][15], EP with unsaturated polyester (UP) [10,16], PU with UP resin [17,18], and EP with vinyl ester (VE) resin [11,19,20]. Hybrid resins have great damping abilities and some of them also showed synergistic mechanical properties.…”

Hybrid Thermoset Matrix Carbon Fibre Reinforced Composites, a Study of Interlaminar Properties

“…Additional flexibility and toughness may be achieved, as a result. Due to the above mentioned phenomena, crack propagation in hybrid resin is hindered by lots of bounds and molecule chain entanglements [1,[6][7][8].…”

“…1), the result can be improved damping properties, and enhanced toughness can be also reached. These hybrid resin matrix materials can be used in field of aircraft, automotive and sports equipment industries as well as high enegy absorbing structural material [6,8,9].…”