Journal ArticleDOI
Damping properties of interpenetrating polymer networks of polyurethane-modified epoxy and polyurethanes
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TLDR
In this paper, 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.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 PU-crosslinked epoxy. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 328–335, 1999read more
Citations
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Effect of inorganic nanoparticles on mechanical property, fracture toughness and toughening mechanism of two epoxy systems
TL;DR: In this article, the effect of silica nanoparticles on the mechanical property and fracture toughness of two epoxy systems cured by Jeffamine D230 and 4,4′-diaminodiphenyl sulfone (denoted DDS) was investigated.
Journal ArticleDOI
Damping properties and morphology of polyurethane/vinyl ester resin interpenetrating polymer network
TL;DR: In this article, a series of polyurethane/vinyl ester resin simultaneous and gradient interpenetrating polymer networks (PU/VER IPN and gradient IPN), cured at room temperature, were synthesized by introducing acrylic esters as VER's comonomers.
Journal ArticleDOI
Gradient copolymers with broad glass transition temperature regions: Design of purely interphase compositions for damping applications
TL;DR: In this paper, the effect of composition gradient steepness is studied by designing "constant" or "increasing" gradients via the comonomer addition rate during semibatch polymerization.
Journal ArticleDOI
Performance of polyurethane modified asphalt and its mixtures
TL;DR: In this article, a disk-based serrated mixer was used to combine polyurethane (PU), base or styrene-butadiene-styrene (SBS) modified asphalt and its mixtures.
Journal ArticleDOI
Nonisocyanate Thermoplastic Polyhydroxyurethane Elastomers via Cyclic Carbonate Aminolysis: Critical Role of Hydroxyl Groups in Controlling Nanophase Separation
Emily K. Leitsch,Goliath Beniah,Kun Liu,Tian Lan,William H. Heath,Karl A. Scheidt,John M. Torkelson +6 more
TL;DR: In this article, the authors used polypropylene glycol-based or polytetramethylene oxide (PTMO)-based soft segments, which reduce hydrogen bonding by steric hindrance and dilution of oxygen atom content and result in nanophase-separated PHUs with robust, tunable mechanical properties.
References
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Book
Mechanical Properties of Polymers and Composites
TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Journal ArticleDOI
Interpenetrating Polymer Networks
TL;DR: Interpenetrating polymer networks (IPN) are a unique type of polyblend, synthesized by swelling a crosslinked polymer (I) with a second monomer (II), together with crosslinking and activating agents, and polymerizing monomer II in situ as discussed by the authors.
Journal ArticleDOI
Characterization of the area under loss modulus and tan δ–temperature curves: Acrylic polymers and their sequential interpenetrating polymer networks
Journal ArticleDOI
Effect of morphology, crosslink density, and miscibility on interpenetrating polymer network damping effectiveness
TL;DR: In this paper, the areas under the linear loss modulus versus temperature curves (loss area, LA) and tan δ versus temperature curve (TA) were evaluated for a number of acrylic, methacrylic, styrenic and butadiene based copolymers and interpenetrating polymer networks.
Journal ArticleDOI
Group contribution analysis of the damping behavior of homopolymers, statistical copolymers, and interpenetrating polymer networks based on acrylic, vinyl, and styrenic mers
TL;DR: In this paper, the integral of the loss modulus versus temperature plots in the vicinity of the glass transition temperature (loss area, LA) was characterized for various homopolymers, statistical copolymers and interpenetrating polymer networks, based on acrylics, vinyls, and styrenic mers.
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