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Qian J.,East China University of Science and Technology | Qian J.,Sino Polymer Co. | Liu Z.,East China University of Science and Technology | Liu Z.,Sino Polymer Co. | And 5 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2015

Tetraglycidyl 4,4'-diaminodiphenylmethane (TGDDM) was toughened by reactive blending and physical blending respectively with multifunctional vinyl ester resin (MVER). Novel multifunctional hybrid oligomer (MVEO-2) containing two different reactive groups was synthesized through the esterfication of TGDDM with acrylic acid (AA)[n(TGDDM)/n(AA)=1∶ 2] while MVEOmix was obtained by physical blending TGDDM with MVER. The structures and properties of MVEO-2 and MVEOmix were studied. FTIR and 1H NMR show that two oligomers have same structural components. It was found that MVEOmix presented bimodal and narrow molecular weight distribution while MVEO-2 had multimodal and broad molecular weight distribution. MVEO-2 showed obvious improvement in thermal stability than MVEOmix from thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) analysis. The strength and toughness of MVEO-2 were improved than those of MVEOmix: flexural strength improved 17%, tensile strength improved 38%, elongation improved 35% and impact strength improved 24%. The excellent performance of MVEO-2 was attributed to the formation of close and even interpenetrating polymer network (IPN), which was demonstrated by scanning electron microscope (SEM). ©, 2015, Higher Education Press. All right reserved. Source


Qian J.,East China University of Science and Technology | Qian J.,Sino Polymer Co. | Liu Z.,East China University of Science and Technology | Liu Z.,Sino Polymer Co. | And 5 more authors.
Journal of Applied Polymer Science | Year: 2015

Novel multifunctional hybrid vinylized epoxide oligomers (MVEOs) containing two different reactive groups were synthesized through the esterification of tetraglycidyl 4,4′-diaminodiphenylmethane (TGDDM) with acrylic acid (AA) at various molar ratios. The changes of vinyl ester and epoxy groups in MVEOs were studied by Fourier Transform Infrared Spectroscopy, Nuclear Magnetic Resonance, and Gel permeation chromatograph. It was found that more amount of AA in the reactant would increase the contents of vinyl ester and molecular weight. The curing behavior of MVEOs has been studied by scanning differential scanning calorimetry (DSC). Two distinct exothermic peaks were observed in the MVEOs which can be attributed to the radical polymerization of vinyl ester/styrene and condensation polymerization of epoxy/MeTHPA, respectively. Two different kinds of curing programs have influenced each other which makes the exothermic peaks overlapped. The DSC scan of MVEO-2 indicated that the radical initiated curing reaction of vinyl ester won't notably affect the curing of epoxy without MeTHPA. However, the thermal curing of vinyl ester in MVEO-2 without MEKP/Co would be occurred with the temperature rising. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42276. © 2015 Wiley Periodicals, Inc. Source

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