Nonisothermal cocuring behavior and kinetics of epoxy resin/3‐glycidyloxypropyl‐POSS with MeTHPA

Gao, Jungang; Kong, Dejuan; Li, Shurong

doi:10.1002/pc.20766

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…However, E a increased at 1% CNC, this can be explained by the steric hindrance generated by well‐dispersed CNC in the MA matrix [Fig. (c)], which retarded the postpolymerization of MA resin . The E a at 4% CNC was higher than that of 2% CNC [Fig.…”

Section: Resultsmentioning

confidence: 99%

Dynamic postpolymerization of 3D‐printed photopolymer nanocomposites: Effect of cellulose nanocrystal and postcure temperature

Yang

Wang

et al. 2018

J Polym Sci B Polym Phys

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Cellulose nanocrystal (CNC) reinforced methacrylate (MA) resin nanocomposite was prepared by 3D stereolithography printing. A postcure process, where the printed nanocomposite was heat-treated under different temperatures, was applied to improve the property of the printed nanocomposites. To investigate the effect of CNC and postcure temperature on the kinetic behavior of the postpolymerization of printed nanocomposites, Fourier-transform infrared spectroscopy and differential scanning calorimetry measurement of the printed nanocomposites before and after postcure were analyzed. The postpolymerization of MA nanocomposites was promoted at a postcure temperature of 140 8C for the printed 0.5% CNC/MA nanocomposites compared to the printed MA resin. The addition of CNC retarded the polymerization of MA resin during 3D printing, resulting in poorer mechanical properties of the printed nanocomposites compared to the printed MA resin. However, after postcure, the mechanical properties of the printed nanocomposites were improved by the postpolymerization of the MA nanocomposites. V C 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 935-946

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Section: Resultsmentioning

confidence: 99%

Dynamic postpolymerization of 3D‐printed photopolymer nanocomposites: Effect of cellulose nanocrystal and postcure temperature

Yang

Wang

et al. 2018

J Polym Sci B Polym Phys

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“…The solution viscosity was 5 × 10 4 mPa·s at room temperature. POSS was synthesized according to the literature by the hydrolytic condensation of 3‐glycidyloxypropyltrimethoxysilane catalyzed with tetramethylammonium hydroxide firstly in isopropyl alcohol and secondly in toluene. 3‐Glycidyloxypropyltrimethoxysilane was purchased from Yuanye Biotech Co. (China).…”

Section: Methodsmentioning

confidence: 99%

Polyurethane electrospun mats strengthened and toughened by physically blended polyhedral oligomeric silsesquioxane

Hao

Fang

Jixian

et al. 2014

J of Applied Polymer Sci

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In this work, polyfunctional polyhedral oligomeric silsesquioxane (POSS) with glycidyl ether groups was physically blended with end‐capped polyurethane (PU) to improve the mechanical strength of PU electrospun mats. It was found that not only the tensile strength was elevated, but also the elongation‐at‐break was greatly improved. Fourier transform infrared spectroscopy results suggested that no chemical reaction happened, and there was no hydrogen bonding between POSS and PU, but the mobility of the PU chains was restricted. Wide‐angle X‐ray diffraction patterns showed that POSS aggregated inside the PU electrospun fibers. Scanning electron microscopy observation showed apparent die‐swelling, indicating that the elasticity of PU chains was enhanced. This was always the result of strengthened chain–chain interactions. From the experimental observations, it was speculated that a physical polymer–particle network was established through attachment of PU chains onto the POSS nanoparticles and embedment of PU chains inside the POSS aggregates, which results in the simultaneous improvements in strength and extensibility. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40902.

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“…Assuming the maximum conversion being independent of the heating rate, the accurate E a can be determined. 34,35 In the present study, the reactions were conducted at four different heating rates: 5, 10, 15, and 20 C min À1 . Ozawa…”

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confidence: 99%

Biowaste chicken eggshell powder as a potential cure modifier for epoxy/anhydride systems: competitiveness with terpolymer-modified calcium carbonate at low loading levels

et al. 2017

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Biowaste chicken eggshell (ES) powder was applied as a potential cure modifier in epoxy/anhydride systems. Cure behaviour and kinetics of composites filled with very low content (0.1 wt% based on epoxy resin) of ES, calcium carbonate (CaCO 3 ), and terpolymer-modified fillers, mES and mCaCO 3 , were discussed comparatively. Surface analysis was performed by X-ray photoelectron spectroscopy. Cure kinetics was investigated by differential (Friedman) and integral (Ozawa and Kissinger-Akahira-Sunose) isoconversional methods using dynamic differential scanning calorimetry (DSC) data. Overall, protein precursors naturally existing in the structure of pristine ES facilitated crosslinking of epoxy and hardener of anhydride with functional groups resulting from terpolymer attachment to CaCO 3 particles. Accelerated/hindered cure was observed depending on the filler type and surface characteristics, as investigated via the autocatalytic/non-catalytic nature of reactions and comparison of activation energy values of four types of composites. An enhanced cure was identified for composites containing untreated ES, which could be inferred on account of the lower competitive cure of carboxyl groups in the terpolymer backbone with epoxy compared to peptide groups existing in microporous pristine ES.On the other hand, mCaCO 3 revealed low values of activation energy compared to pristine CaCO 3 , but still of the same order as ground biowaste ES.

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Nonisothermal cocuring behavior and kinetics of epoxy resin/3‐glycidyloxypropyl‐POSS with MeTHPA

Cited by 18 publications

References 27 publications

Dynamic postpolymerization of 3D‐printed photopolymer nanocomposites: Effect of cellulose nanocrystal and postcure temperature

Dynamic postpolymerization of 3D‐printed photopolymer nanocomposites: Effect of cellulose nanocrystal and postcure temperature

Polyurethane electrospun mats strengthened and toughened by physically blended polyhedral oligomeric silsesquioxane

Biowaste chicken eggshell powder as a potential cure modifier for epoxy/anhydride systems: competitiveness with terpolymer-modified calcium carbonate at low loading levels

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