Preparation and physical properties of functionalized graphene/waterborne polyurethane UV-curing composites by click chemistry

Luo, Xiaomin; Zhang, Peng; Liu, Rui; Li, Weihu; Ge, Binghui; Cao, Min

doi:10.1002/pi.5070

Cited by 26 publications

(14 citation statements)

References 41 publications

(53 reference statements)

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“…The modification of GO with isophore diidocyanate (IPDI) and octadecylamine (ODA) [23], titane coupling agent [24], 3-aminopropyl triethoxysilane (APTES) [25,26], and hydramines (MEA-monorthanolamine, DEA-diethanolamine and TEA-triethylamine) [27] has been reported to improve the compatibly with a WPU matrix. The applications of graphene (pristine, oxidized, or functionalized)/WPU composites as electromagnetic interference (EMI) shielding devices [28][29][30][31][32], textiles [33,34], anticorrosives [24,[35][36][37][38], and flame retardant coatings [39] have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Composite Films of Waterborne Polyurethane and Few-Layer Graphene—Enhancing Barrier, Mechanical, and Electrical Properties

Cunha

Paiva

2019

J. Compos. Sci.

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Graphene has excellent mechanical, thermal, and electrical properties. Graphene can serve as potential reinforcement in polymer-based nanocomposites. In order to achieve this goal, graphene has to be distributed homogeneously and dispersed throughout the polymer matrix, establishing a strong interface with the polymer. Solution mixing is an interesting method for the preparation of homogeneous nanocomposites, in particular when using environmentally friendly solvents such as water. The major difficulty met in the production of graphene/polymer composites concerns the preparation and stabilization of graphene in aqueous suspension. In the present work three different graphite-based materials, with different crystallinity and purity grades, were exfoliated in aqueous solution of an amphiphilic pyrene derivative, forming few-layer graphene (FLG). The FLG prepared was dispersed in waterborne polyurethane (WPU) to produce composite films. The composite films were produced by solvent casting and spray coating, forming free-standing films that were characterized in terms of its distribution of FLG through the composite, its permeability to water vapor, its electrical resistivity, and its mechanical properties. The studies demonstrated the influence of different factors on the composite film properties such as the use of graphite vs. FLG, the FLG lateral dimensions, and the FLG composition and composite preparation method.

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Section: Introductionmentioning

confidence: 99%

Composite Films of Waterborne Polyurethane and Few-Layer Graphene—Enhancing Barrier, Mechanical, and Electrical Properties

Cunha

Paiva

2019

J. Compos. Sci.

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“…This indicates clearly that the effect of GO on the final epoxy conversion depends on GO content and therefore has to be understood well. The effect of fillers on the UV curing phenomena of the resins has been investigated in several studies with a diversity of reasons suggested for the observations. The decrease of final epoxy conversion has been proposed to be due to either a free‐volume decrease or vitrification of the on‐cure resin .…”

Section: Resultsmentioning

confidence: 99%

The effect of graphene oxide on UV curing kinetics and properties of SU8 nanocomposites

Sharif

Pourabbas

Sangermano

et al. 2016

Polymer International

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In the present study SU8 nanocomposites were prepared by incorporating graphene oxide (GO), and its effect on the UV curing kinetics, morphology, electrical, hardness and thermal properties of the nanocomposites were investigated at different loading levels of GO (0.1 − 3 wt%). Studying the reaction kinetics of the UV curing process by means of real-time infrared spectroscopy showed that the polymerization rate and the final conversion of epoxy groups was related to the loading level of GO in the nanocomposites. An autocatalytic kinetics model of the curing reaction confirmed the effect of GO nanoparticles on the curing rate constant (k), the order of the initiation reaction (m) and the ultimate conversion of the UV-cured nanocomposites. Appropriate experimental observations indicated that dispersion of GO within the resin plays a critical role on the cure kinetics and final conversion. The results of the kinetics modeling and morphological observations showed that the curing rate constant of the nanocomposites is highly dependent on the GO content and its dispersion state, indicating that GO prevents epoxy resin crosslinking by photoinitator deactivation. Moreover, oxygen functionalities, such as hydroxyl and carboxyl groups, on the surface of GO facilitate interfacial interactions between epoxy groups from the matrix and GO. Electrical conductivity measurements demonstrated that the UV-induced photo-cured GO filled resins are conductive SU8 nanocomposites. It was observed that the thermal stability of the nanocomposites is enhanced due to the dispersion of GO in the matrix. Moreover, the microhardness analysis showed that addition of GO to neat SU8 increases the mechanical hardness of the nanocomposite.

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“…The decrease of the mechanical properties above a certain GO content was observed in many studies 26,27) . In many studies 13,18,19,28,29) , the incorporation of GO or functionalized graphene results in the decreased EB. Thus, it is meaningful that both stiffness and toughness increase with the incorporation of GO nanosheets in this study.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties, Thermal Stability, and Glass Transition Behaviors of a Waterborne Polyurethane/Graphene Oxide Nanocomposite

2017

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We synthesized anionic waterborne polyurethane (aWPU) from IPDI (di-isocianate), PTMG (diol), DMPA (anionic ionomer), TEA (neutralizer), and BD (chain extender). Cationic WPU (cWPU) was also prepared using MDEA (cationic ionomer) and HCl (neutralizer) instead of DMPA and TEA. Since the graphene oxide (GO) is anionic due to the -COOH group, GO and aWPU are not compatible because of the repulsive force between identical ionic charges. Thus, we fabricated cationic surfactant treated GO/aWPU to increase the compatibility. cWPU/GO, where attractive forces act between anionic GO and cationic WPU, was also prepared. The thermal stability, glass transition temperature, and mechanical properties of the nanocomposites were investigated. The thermal stability of the WPU was enhanced with the incorporation of GO nanosheets. The glass transition temperature of the hard segment of WPU was increased by the incorporation of GO. These results are attributed the ne dispersion of GO in WPU and strong interfacial interactions between GO and WPU. Enhanced dispersion and interfacial interaction lead to better mechanical properties. Tensile strength, initial modulus, and elongation-at-break of WPU/GO nanocomposites were increased with the incorporation of GO nanosheets. By a simple method (anion-cation matching) we could prepare WPU/GO nanocomposites with enhanced stiffness and toughness.

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Preparation and physical properties of functionalized graphene/waterborne polyurethane UV-curing composites by click chemistry

Cited by 26 publications

References 41 publications

Composite Films of Waterborne Polyurethane and Few-Layer Graphene—Enhancing Barrier, Mechanical, and Electrical Properties

Composite Films of Waterborne Polyurethane and Few-Layer Graphene—Enhancing Barrier, Mechanical, and Electrical Properties

The effect of graphene oxide on UV curing kinetics and properties of SU8 nanocomposites

Mechanical Properties, Thermal Stability, and Glass Transition Behaviors of a Waterborne Polyurethane/Graphene Oxide Nanocomposite

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