Thermal, mechanical, and tribological properties of epoxy polymer/EPU blends reinforced by low concentration of octaaminophenyl POSS

Yi, Hongling; Zhang, Mingfei; Yao, Donggang; Gong, Weiguang

doi:10.1002/pen.25620

Cited by 12 publications

(7 citation statements)

References 35 publications

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“…The crosslinked ER network was examined by Fourier-transform infrared (FTIR) spectroscopy (Figure b). The IR signal at ∼910–914 cm –1 , which corresponds to the epoxide group of DGEBA, disappeared after curing, confirming the successful ring-opening reaction of the DGEBA induced by the curing agents to form a crosslinked ER network Figure S2) showed low intensity. − …”

Section: Results and Discussionmentioning

confidence: 83%

Cellulose Nanocrystal Chiral Nematic Composites with Wet Mechanical Adaptability

Walters

D’Acierno

et al. 2022

Chem. Mater.

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Cellulose nanocrystal (CNC)-based chiral nematic films are important optical materials due to their ability to selectively reflect circularly polarized light but are often limited in application by their instability in water. Improving the mechanical performance and stability of photonic CNC-based materials in water is therefore of great importance for advancing the utility of CNCs. Here, water-resistant covalently crosslinked chiral photonic composite films of CNCs were formed by the incorporation of an epoxy resin (ER). The resulting materials can adapt their stiffness and toughness through the mediation of inter-CNC and CNC−water interactions upon exposure to water. Dry films of CNC− ER exhibit improved mechanical strength and toughness, likely related to the uniform and continuous chiral nematic structures in which stress transfer is facilitated by interrod interactions. In water, the interrod interactions are switched off by establishing rod−water interactions, resulting in up to ∼4-fold increase in toughness relative to the dry composites. Moreover, the composite films display tunable chiral photonic properties across the visible spectrum and moderate red shifting of reflection in response to slight swelling in water. The switchable rod−rod/water interaction enabled by a hydrogen-bonded/covalent dual network opens a path to develop CNC-based materials with mechanical adaptability and responsive chiral optical properties.

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Section: Results and Discussionmentioning

confidence: 83%

Cellulose Nanocrystal Chiral Nematic Composites with Wet Mechanical Adaptability

Walters

D’Acierno

et al. 2022

Chem. Mater.

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“…The parameters T m , t m , and a are calculated by the least-squares method so that the theoretical dependence (7) would best fit the experimental data. We calculate the following values of parameters of Equation ( 7) in the cases of various compositions, which are presented in Table 2.…”

Section: Kinetics Of Heat Release During the Curing Processmentioning

confidence: 99%

“…[1,2] The properties of epoxy composites can be changed largely by using various epoxy resins, hardeners, fillers, plasticizers, and changing the quantitative content. [3][4][5][6][7][8] The fillers are used to obtain the desired viscosity, reduce shrinkage, and reduce the temperature coefficient of expansion, to reduce the cost of the product and its coloring. [9][10][11][12][13][14][15] In the development of composite compositions, the polymerization process and the cure rate are important.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic features of polymerization of epoxy resin modified by silicon‐containing additives and mineral fillers

Kovaleva

Савотченко

2021

Polymer Engineering & Sci

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In this article, we study the process of polymerization of a modified ED-20 epoxy binder under conditions of highly filled systems. It is found that modifying additives affect the process of polymerization of the binder, increasing the degree of conversion of epoxy groups of ED-20 resin, speeding up the process of polymerization, and increasing the exothermic effect of the reaction. Curing in the presence of a modifying silicon-containing additive takes place in a mode that promotes the formation of a more ordered structure, creating opportunities for relaxation of internal stresses and favorable conditions for the formation of an ordered microstructure. The equations sufficiently fitting the measured points of the concentration of epoxy groups are calculated. We obtain the kinetic curves of curing, which illustrate the process of heat release of the ED-20 binder and the same system modified with mineral fillers. It is found that the heat release occurs more intensively when modifiers are introduced into the epoxy binder. It is derived that the experimental data of kinetics of heat release at considered time range can be sufficiently described by a parabolic equation.

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“…Nanocomposites with different extended functions such as corrosion protection, 12 electrical conductivity, 13 thermal conductivity, 14 and self‐healing 15 are receiving great attention. Common nanomaterials include silica, 16,17 graphene, 18,19 and carbon nanotubes (CNT) 20,21 . Among them, silica nanoparticles are a popular material which offers advantages such as cost effectiveness and versatility.…”

Section: Introductionmentioning

confidence: 99%

Mechanically robust and self‐healing waterborne polyurethane nanocomposites based on inorganic organic hybrid materials and reversible covalent interaction

Wang

et al. 2021

Polymer Engineering & Sci

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Endowing waterborne polyurethane (WPU) materials with mechanically reinforced and self‐healing property is a pressing issue for expanding practical applications. In this article, we proposed a simple method to give WPU with self‐healing properties while improving the mechanical properties. First, furfuryl‐modified silica nanoparticles (furan@SiO2) with high functionality and excellent dispersibility were prepared by the sol–gel method. Furan@SiO2 was then introduced into the side‐hanging maleimide WPU to form a thermally reversible inorganic–organic network (WMSPUS‐x) based on the Diels‐Alder reaction. The morphologies and properties of furan@SiO2 and WMSPUS‐x emulsions were analyzed by TEM and DLS, demonstrating the excellent dispersion of furan@SiO2 and the storage stability of emulsions. The cross‐linking density of the nanocomposites was varied by the furan@SiO2 contents, and the effects of cross‐linking density on mechanical and self‐healing properties were systematically investigated. In addition, the thermal stability of WMSPUS‐x nanocomposites was significantly improved shown by TGA results. Finally, qualitative and quantitative studies of the self‐healing process were carried out to verify that WMSPUS‐x nanocomposites possess great self‐healing capacity. The outcomes indicate that WMSPUS‐x nanocomposites have great potential for application as a smart material.

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Thermal, mechanical, and tribological properties of epoxy polymer/EPU blends reinforced by low concentration of octaaminophenyl POSS

Cited by 12 publications

References 35 publications

Cellulose Nanocrystal Chiral Nematic Composites with Wet Mechanical Adaptability

Cellulose Nanocrystal Chiral Nematic Composites with Wet Mechanical Adaptability

Kinetic features of polymerization of epoxy resin modified by silicon‐containing additives and mineral fillers

Mechanically robust and self‐healing waterborne polyurethane nanocomposites based on inorganic organic hybrid materials and reversible covalent interaction

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