Viscosity‐curing time behavior, viscoelastic properties, and phase separation of graphene oxide/epoxy asphalt composites

Zhao, Ruikang; Fan, Jing; Li, Chenxuan; Wang, Rui; Xi, Zhonghua; Cai, Jun; Wang, Qingjun; Xie, Hongfeng

doi:10.1002/pc.26848

Cited by 21 publications

(10 citation statements)

References 65 publications

(89 reference statements)

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“…Apart from the similar glass transition to EV50 and EV55 at ~25 °C, it is interesting to note that another broad peak appears between 40 °C and 100 °C in the tan δ–temperature curve of EV45. In a polymer blend, this shoulder indicates another glass transition and two distinct glass transitions indicate the immiscibility between two components [ 49 , 50 ]. As shown in Figure 8 a, no β glass transition peak appears after the α transition.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Epoxy/Acid Stoichiometry on the Cure Behavior and Mechanical Properties of Epoxy Vitrimers

Fan

Zhao

et al. 2022

Molecules

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Bisphenol A epoxy resin cured with a mixture of dimerized and trimerized fatty acids is the first epoxy vitrimer and has been extensively studied. However, the cure behavior and thermal and mechanical properties of this epoxy vitrimer depend on the epoxy/acid stoichiometry. To address these issues, epoxy vitrimers with three epoxy/acid stoichiometries (9:11, 1:1 and 11:9) were prepared and recycled four times. Differential scanning calorimetry (DSC) was used to study the cure behavior of the original epoxy vitrimers. The dynamic mechanical properties and mechanical performance of the original and recycled epoxy vitrimers were investigated by using dynamic mechanical analysis (DMA) and a universal testing machine. Furthermore, the reaction mechanism of epoxy vitrimer with different epoxy/acid stoichiometry was interpreted. With an increase in the epoxy/acid ratio, the reaction rate, swelling ratio, glass transition temperature and mechanical properties of the original epoxy vitrimers decreased, whereas the gel content increased. The recycling decreased the swelling ratio and elongation at break of the original epoxy vitrimers. Moreover, the elongation at break of the recycled epoxy vitrimers decreased with the epoxy/acid ratio at the same recycling time. However, the gel content, tensile strength and toughness of the original epoxy vitrimers increased after the recycling. The mechanical properties of epoxy vitrimers can be tuned with the variation in the epoxy/acid stoichiometry.

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Section: Resultsmentioning

confidence: 99%

Influence of the Epoxy/Acid Stoichiometry on the Cure Behavior and Mechanical Properties of Epoxy Vitrimers

Fan

Zhao

et al. 2022

Molecules

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“…Figure 5 shows the loss modulus versus storage modulus curves (also called Cole-Cole plots) of the unmodified and WCO-modified EAR binders. Cole-Cole plots of polymeric materials indicate the compatibility and homogeneity between individual components [ 60 , 61 ]. Due to the inhomogeneity between asphalt and cured epoxy, epoxy asphalt binder exhibits two smooth semicircular curves: the one at high moduli is attributed to cured epoxy and the one at low moduli is related to asphalt [ 15 ].…”

Section: Resultsmentioning

confidence: 99%

Waste Cooking Oil-Modified Epoxy Asphalt Rubber Binders with Improved Compatibility and Extended Allowable Construction Time

et al. 2022

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The application of crumb rubber from end-of-life tires and waste cooking oil (WCO) in road pavements is of significant importance from an economic and environmental viewpoint. However, the incorporation of crumb rubber greatly shortens the allowable construction time of epoxy asphalt binders due to the high viscosity of the epoxy asphalt rubber (EAR) binder and poor compatibility between crumb rubber and asphalt binder. To lower the viscosity of asphalt rubber, extend the allowable construction time and improve the compatibility of EAR binder, waste cooking oil (WCO) was introduced. The effect of WCO on the viscosity–time behavior, thermal stability, dynamic modulus, glass transitions, crosslink density, damping ability, compatibility, mechanical properties and phase separation of WCO-modified EAR binders was investigated by using the Brookfield viscometer, thermogravimetric analysis, dynamic mechanical analysis, universal testing machine and laser confocal microscopy. The test results demonstrated that the incorporation of WCO declined the viscosity and extended the allowable construction time of the unmodified EAR binder. The inclusion of WCO improved the compatibility between asphalt and crumb rubber and the damping ability and elongation at the break of the unmodified EAR binder. The presence of WCO had a marginal effect on the thermal stability of the unmodified EAR binder. Confocal microscopy observation revealed that asphalt rubber particles aggregated in the epoxy phase of the unmodified EAR binder. With the inclusion of WCO, co-continuous asphalt rubber particles became more spherical.

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“…% leads to a slight increase in dynamic viscosity. The introduction of graphene nanostructures often leads to a greater increase in dynamic viscosity at such concentrations, as was shown in [20,21]. Therefore, a study was made of the dispersion of FLG particles in a photopolymer resin before and after ultrasonic treatment at 50 °C.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Few-layer Graphene on the Complex of Hardness, Strength and Thermo Physical Properties of Polymer Composite Materials Produced by DLP 3D Printing

Кидалов¹,

Voznyakovskii²,

Vozniakovskii³

et al. 2022

Preprint

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The results of studying the effect of particles of few-layer graphene (FLG) synthesized by self-propagating high-temperature synthesis (SHS) on the complex of strength and thermo physical properties of polymer composite products obtained by DLP 3D printing are presented. It has been discovered to achieve an increase in thermo physical and strength parameters of polymers modified by FLG compared with samples made on the unmodified base resin. This result was achieved due to low defectiveness, namely the absence of Stone-Wales defects in the structure of FLG due to the homogeneous distribution of FLG over the volume of the polymer in the form of highly dispersed aggregates. It was possible to increase hardness by 120 %, bending strength by 102 %, Charpy impact strength by 205 %, and thermal conductivity at 25 °C by 572 % at concentrations of few-layer graphene of no more than 2 wt. %.

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Viscosity‐curing time behavior, viscoelastic properties, and phase separation of graphene oxide/epoxy asphalt composites

Cited by 21 publications

References 65 publications

Influence of the Epoxy/Acid Stoichiometry on the Cure Behavior and Mechanical Properties of Epoxy Vitrimers

Influence of the Epoxy/Acid Stoichiometry on the Cure Behavior and Mechanical Properties of Epoxy Vitrimers

Waste Cooking Oil-Modified Epoxy Asphalt Rubber Binders with Improved Compatibility and Extended Allowable Construction Time

The Effect of Few-layer Graphene on the Complex of Hardness, Strength and Thermo Physical Properties of Polymer Composite Materials Produced by DLP 3D Printing

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