Preparation of HNTs‐d‐GO hybrid nanoparticles for gallic acid epoxy composites with improved thermal and mechanical properties

Abstract

KH550 modified halloysite nanotubes (m-HNTs) were hybridized with sulfoxide chloride acylated graphene oxide (m-GO) to prepare hybrid nanoparticles (HNTs-d-GO). The microstructure and morphology analysis of HNTs-d-GO hybrid nanoparticles showed that the ordered lamellar structure of GO after acyl chlorination was stripped, and the organic groups on the surface of the lamellar increased. HNTs-d-GO hybrid nanoparticles were formed through the amidation of m-HNTs and m-GO. Then HNTs-d-GO hybrid nanoparticles were incorporated in galic acid epoxy resin to improve the thermal and mechanical properties. HNTs-d-GO/galic acid epoxy resin (HNTs-d-GO/GAER) bio-based nanocomposites were prepared with methyl tetrahydrophthalic anhydride as curing agent. The galic acid epoxy composites with the addition of HNTs-d-GO exhibited significant enhancements of impact strength, tensile strength, storage modulus, and glass transition temperature. The initial thermal decomposition temperature (T 5% ) decreased, and the mass retention at 800 C increased, thermal stability of HNTs-d-GO/GAER composites were enhanced. At an optimum concentration of 0.75 wt% HNTs-d-GO, a simultaneous increase in strength and toughness was observed in comparison to the unfilled cured resin, the impact strength is 2.87 kJ/m 2 , which is 30.4% higher than pure GAER, and the tensile strength is 42.62 MPa, which is 29.2% higher than pure GAER. Compared with pure gallic acid epoxy resin, the content of HNTs-d-GO is 0.25 wt%, T g increased by 28.9 C.

Structural performance evaluation of hybrid polymer composites for critical infrastructure pick-and-place robot grippers using silica nanoparticles

“…Figure 2 (a) illustrates the detailed arrangement of the quasi-static sequence 45⁰C1/45⁰SG2/45⁰EG2/45⁰C1/45⁰EG2/45⁰SG2/45⁰C1 method of stacking polymer fiber matrices, representing an innovative approach for constructing polymer composite structures. This technique involves the layer-by-layer continuation of the process until the desired thickness, consisting of 11 layers, and configuration are achieved (Zhao et al ., 2022). Figures 3 (a) and (b) illustrate the schematic representation of the dimensions for the interply bidirectional hybrid polymer composite specimens used in ASTM standard tensile, and flexural test.…”

“…Among these mechanical tests, flexural and tensile tests are frequently employed to achieve this objective. Figures 4 (a) and (b) show the fabricated structure of the hybrid polymer composite matrix for the tensile, and flexural test specimens (Zhao et al ., 2022). These tests enabled a comprehensive assessment of the mechanical properties of the composites, facilitating the identification of potential structural defects.…”

A New Strategy to Improve the Toughness of Epoxy Thermosets—By Introducing Poly(ether nitrile ketone)s Containing Phthalazinone Structures

“…However, it significantly reduces the strength and modulus of the material [ 8 , 9 ]. Another strategy is incorporating secondary components such as rubbers [ 10 , 11 ], nanoparticles [ 12 , 13 , 14 ], the thermotropic liquid crystalline polymer [ 15 , 16 , 17 ], and thermoplastic resins [ 18 , 19 , 20 , 21 ] into epoxy resins. Unfortunately, adding rubber particles can significantly reduce the system’s modulus and glass transition temperature [ 22 ], and the uneven distribution of nanoparticles can lead to defects in the material [ 23 ].…”

Preparation of HNTs‐e‐POSS hybrid nanoparticles and modification of gallic acid epoxy resin

“…Tarzia et al 15 synthesized glycidol ethers (GEGA) of gallic acid by two-step method and analyzed the curing mechanism of three amine curing agents. In our previous studies, 16,17 gallic acid reacted with excessive epichlorohydrin to form a polyphenolic epoxy resin (GAER), which was used as a matrix to prepare highperformance nanocomposites. The research results indicate that the GAER structure contains multiple epoxy functional groups and has good mechanical and thermal properties after curing, making it a good matrix choice for composite materials.…”