‘Good vibrations’, the science and application of intrinsically damped composite materials

Chun

Chung

et al. 2004

Sandwich-type layered composite material was prepared with epoxy beam and polyurethane copolymer that was synthesized from 4,4-methylene bis (phenylisocyanate), poly(tetramethyleneglycol), and 1,4-butanediol as a chain extender. As for the polyurethane, shape recovery was improved with higher content of hard segment, and the highest damping effect as judged by tan ␦ was observed at 30 -35% hard segment. The composite material had better impact strength and higher tan ␦ than epoxy beam alone, but the superiority became less as more hard segment was incorporated. The interfacial binding force between polyurethane and the epoxy beam also decreased in proportion to the hard segment content.

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Vibration control ability of multilayered composite material made of epoxy beam and polyurethane copolymer with shape memory effect

Chun

Chung

et al. 2004

“…Besides what is mentioned above, the modification to resin structure, such as incorporating flexible backbone structure, which may decrease the crosslink density of epoxy resin system, will be an effective way to improve its damping intensity. Grant et al . used viscoelastic RF‐69 as the chain extension modifier to prepare intrinsic epoxy resin damped composites, and the results showed that the damping intensity of the composite improved significantly.…”

Section: Introductionmentioning

confidence: 99%

Acrylic‐based epoxy resin damping systems: Synthesis, characterization, and properties

Zhao

Wang

et al. 2016

Acrylate-based epoxy resin (AE)/low molecular weight polyamine (LPA) composites were developed. The chemical structure, curing behavior, fracture morphology, damping properties, and mechanical properties were evaluated by Fourier transform infrared (FTIR), 1 H-nuclear magnetic resonance ( 1 H-NMR), gel permeation chromatography (GPC), Differential scanning calorimeter (DSC), scanning electron microscope (SEM), Dynamic mechanical thermal analysis (DMTA), and electro mechanical machine. Transmission electron microscope (TEM) and SEM pictures exhibited nanoscale micro-phase separation between epoxy and acrylic segmers. DMTA results indicated that the loss factor of cured AE/LPA system could reach 1.84 and temperature range of tan d > 0.5 was about 84 8C. Tensile strength and elongation at break of the cured AE samples can reach 6.5 MPa and 185%, respectively. V C 2016Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43654.

“…Beside above mentioned, modification on resin structure, such as incorporating flexible backbone structure, which can decrease the crosslink density of a cured epoxy resin system, will be also an effective method to improve its damping properties, which would not lead to significant phase separation and increase in viscosity. Grant et al . used a viscoelastic RF‐69 as chain extension modifier (RF‐69) to prepare intrinsic epoxy resin damped composites, and the results showed that the damped composite improved significantly.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of a low viscosity acrylate based flexible epoxy resin

Zhao

Wang

et al. 2015

A series of low viscosity acrylate‐based epoxy resin (AE)/glycol diglycidyl ether (GDE) systems were prepared. The effect of GDE and low molecular weight polyamide (LPA) content on the rheological behavior, phase structure, damping, and mechanical properties were studied by differential scanning calorimeter (DSC), viscometer, scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA), and electro mechanical machine. The viscosity of the uncured AE systems decreased significantly after the incorporation of GDE. The damping properties were found to decrease slightly with the increasing GDE and LPA content. The tensile strength of the cured AE/GDE samples enhanced significantly after the incorporation of GDE with at least 150% improvement for all the samples while it decreased slightly with increasing LPA content. The AE/GDE cured systems were intended for future use as structural damping materials. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42959.