The FE-SEM analysis revealed that the cured products with C=C ratio 2/1 and 1/1 are homogeneous, whereas phase separation occurs for the 1/2 product. The glass transition temperature, 5% weight loss temperature, Nutlin-3 concentration and tensile modulus of the cured DCO/BMI
increased with increasing BMI content. Regarding the tensile strength, the cured DCO/BMI 1/1 product showed the highest value. To evaluate the reaction of DCO and BMI, the model reaction products of DCO and N-phenylmaleimide (PMI) in DMI were analyzed by (1)H NMR spectroscopy. The (1)H NMR data of DCO revealed that DCO has about 4.8 CH=CH bonds per triglyceride and that the ratio of conjugated and nonconjugated diene moieties is about 41/59. The NMR data of the reaction products Of DCO/PMI with the C=C ratio 2/1. and 1/1 at 200 degrees C for 24 h revealed that both Diels-Alder and ene reactions occurs in addition to radical polymerization. (C) 2009 Wiley Periodicals,
Inc. J Appl Polym Sci 114: 1033-1039, 2009″
“A model is discussed for magnetoelectric (ME) coupling in a nanobilayer of ferromagnetic and piezoelectric phases on a substrate. The theory is applied to a specific case, nickel ferrite and lead zirconate titanate bilayer on strontium titanate substrate. Both low-frequency coupling and ME interactions at frequencies corresponding to bending oscillations have been considered. The www.selleckchem.com/products/BKM-120.html influence of lattice mismatch between the substrate and piezoelectric and piezomagnetic layers on material parameters has been estimated using the Landau-Ginsburg-Devonshire phenomenological thermodynamic theory. At low frequencies, the model Selleckchem Stem Cell Compound Library predicts a maximum in the ME coupling strength when the substrate is of the same thickness
as the bilayer. The ME voltage coefficient drops with further increase in substrate thickness due to clamping effects. The bending oscillations in nanobilayers are expected to occur at ultralow frequencies (< 5 Hz) compared to longitudinal acoustic modes at 100-200 kHz for bilayers of nominal dimensions. The mode frequency shows an increase with increasing substrate thickness, and the resonance value of the ME coefficient is predicted to show a minimum when the substrate-to-bilayer thickness ratio is 0.3.”
“Exfoliation of polymer layered silicate nanocomposites based upon epoxy resin has previously been reported to be enhanced by allowing some homopolymerization of the resin to occur, catalyzed by the onium ion of the organically modified clay, before the addition of the crosslinking agent and the curing of the nanocomposite. In this work we examine the effects of homopolymerization induced by pre-conditioning the resin/clay mixtures by storing them at various temperatures, from room temperature to 100 degrees C, prior to curing.