Journal ArticleDOI
The synthetic kinetics and underwater acoustic absorption properties of novel epoxyurethanes and their blends with epoxy resin
Weihong Sun,Xin Yan,Xi Zhu +2 more
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TLDR
In this article, reaction kinetics between isocyanate-terminated prepolyurethane (PPU) and glycidol using dibutyltin dilaurate (DBTDL) as a catalyst was investigated by monitoring the change in the intensity of the absorbance peak of NCO stretching band at 2,270 cm−1 on Fourier transform infrared spectrum at different temperatures.Abstract:
Reaction kinetics between isocyanate-terminated prepolyurethane (PPU) and glycidol using dibutyltin dilaurate (DBTDL) as a catalyst was investigated by monitoring the change in the intensity of the absorbance peak of NCO stretching band at 2,270 cm−1 on Fourier transform infrared spectrum at different temperatures. The results indicated that the reactions of TDI- and IPDI-type PPU with glycidol followed second-order kinetics, and their activation energies could be efficiently reduced by DBTDL. For TDI-type PPU, the reaction activation energies were 80.37 kJ mol−1 without catalyst, 49.86 kJ mol−1 with 0.1 % of DBTDLs, and 37.85 kJ mol−1 with 0.2 % of DBTDLs, respectively. For IPDI-type PPU, the reaction activation energies were 69.16 kJ mol−1 without catalyst, 63.05 kJ mol−1 with 0.1 % of DBTDLs, and 55.57 kJ mol−1 with 0.2 % of DBTDLs, respectively. This corresponding TDI- and IPDI-type epoxyurethane (EPU) were blended with epoxy resins (EPs) and cured by the Michael adduct of ethlylenediamine with butyl acrylate (molar ratio = 1:1) curing agent, to prepare EPU/EP blend elastomers for underwater acoustic absorption materials. The TDI-type EPUs had good acoustic absorption properties and the average acoustic absorption coefficient of TDI-type EPU was 0.75, the maximum acoustic absorption coefficient was 0.94; the EPUs blended with E-51 EP had better acoustic absorption properties than those from E-44; and the EPU from PPG-2000 had better underwater acoustic absorption properties than that from PPG-1000.read more
Citations
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Journal ArticleDOI
A review on polymer-based materials for underwater sound absorption
TL;DR: In this paper, different kinds of polymer-based materials for underwater sound absorption with regards to key factors associated with sound absorption properties, measurements, applications, and mechanisms are reviewed and summarized.
Journal ArticleDOI
Synthesis and properties of high-solids hybrid materials obtained from epoxy functional urethanes and siloxanes
TL;DR: In this paper, a series of novel high-solids crosslinked hybrid networks based on the epoxy-terminated polyurethane prepolymer and the comb-like structure co-poly(dimethyl)(methyl, 3-glycidoxypropyl)siloxane cured with diethylenetriamine, were obtained.
Journal ArticleDOI
Fabrication of an epoxy graft poly(St-acrylate) composite latex and its functional properties as a steel coating
Erjun Tang,Erjun Tang,Feng Bian,Andrew Klein,Mohamed S. El-Aasser,Shaojie Liu,Miao Yuan,Dishun Zhao +7 more
TL;DR: In this article, a method for preparing epoxy graft poly(St-acrylate) composite latex with high graft ratio has been devised, which will eliminate pollution arising from the organic solvent when solvent-borne systems are used.
Journal ArticleDOI
Thermal degradation studies of poly(urethane–siloxane) thermosets based on co-poly(dimethyl)(methyl, 3-glycidoxypropyl)siloxane and epoxy-terminated urethane oligomer
TL;DR: In this paper, a series of crosslinked hybrid poly(urethane-siloxane) networks based on comb-like structure co-poly(dimethyl)(methyl, 3-glycidoxypropyl) siloxane, epoxy-terminated urethane oligomer cured with diethylenetriamine, were obtained.
Journal ArticleDOI
One-Pot Synthesis and Characterization of Novel Shape-Memory Poly(ε-Caprolactone) Based Polyurethane-Epoxy Co-networks with Diels–Alder Couplings
TL;DR: It was demonstrated that the stress–strain curves for the EP-PUs could be interpreted based on the Standard Linear Solid (SLS) model, and a plateau-like region above the melting temperature (Tm) of PCL confirmed the presence of cross-linked structure.
References
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Journal ArticleDOI
Preparation and Properties of Aqueous Castor Oil-based Polyurethane–Silica Nanocomposite Dispersions through a Sol–Gel Process
Ying Xia,Richard C. Larock +1 more
TL;DR: Waterborne castor oil-based polyurethane-silica nanocomposites with the polymer matrix and silica nanoparticles chemically bonded have been successfully prepared through a sol-gel process, providing an effective and promising way to prepare biorenewable, high performance Nanocomposite coatings.
Journal ArticleDOI
Graft interpenetrating polymer networks of polyurethane and epoxy. I. mechanical behavior
Kuo-Huang Hsieh,J. L. Han +1 more
TL;DR: In this paper, a dynamic mechanical analysis (DMA) indicates that the PU introduced can be incorporated in either the α or β transition domain of the epoxy, which leads to more intimate interpenetration between the PU and epoxy in the graft-IPNs.
Journal ArticleDOI
Hydrogenated hydroxy-functionalized polyisoprene (H-HTPI) and isocyanurate of isophorone diisocyanates (I-IPDI): reaction kinetics study using FTIR spectroscopy
TL;DR: In this article, the reaction kinetics of a hydrogenated hydroxyl-functionalized polyisoprene (H-HTPI) and isophorone diisocyanate isocyanurate (I-IPDI) was studied using direct FTIR spectroscopy.
Journal ArticleDOI
Influence of number of functional groups of hyperbranched polyol on cure kinetics and physical properties of polyurethanes
Pradip K. Maji,Anil K. Bhowmick +1 more
TL;DR: In this article, a FTIR spectroscopy of polyurethane prepolymer with three hyperbranched polyol was used to study the second order kinetic equation and the reaction rate was enhanced with an increase in the number of functional groups of the polyol.
Journal ArticleDOI
Graft interpenetrating polymer networks of polyurethane and epoxy. II, Toughening mechanism
Kuo-Huang Hsieh,J. L. Han +1 more
TL;DR: In this article, a reinitiating crack in the plastic matrix is proposed as the main toughening mechanism and can be invoked to interpret the fracture behavior at high and low shear rates of the graft-IPNs.