Tailoring the crystallization, viscoelastic, and thermal degradation properties of polypropylene by nano‐tungsten carbide and multiwalled carbon nanotubes

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 30, 2025

Abstract The study investigates the individual and collaborative effect of tungsten carbide (WC) multi‐walled carbon nanotubes (MWCNTs) on surface characteristics, viscoelastic, thermal properties polypropylene (PP). uniform dispersion dual nanofillers was observed from TEM analysis, topography revealed using atomic force microscopy (AFM). From dynamic mechanical analysis (DMA), hybrid sample (1 wt% WC 2 MWCNT) exhibited highest storage modulus (75% increase at 20°C compared with PP) further verified by several theoretical models. Cole‐Cole plot composite deviation semi‐circle geometry due to effective mixing in matrix. also manifested creep resistance 67% reduction critical rate neat PP. XRD DSC that P/1W/2C has more thermodynamically stable α crystals. showed rapid cooling resulted formation imperfect non‐uniform impeccable degradation lowest weight loss activation energy (say 10°C/min, T max : 472°C, E a 269 kJ/mol). Highlights Investigated combined MWCNT bi‐nanofillers PP Explored roughness AFM. Evaluated mechanical, viscoelastic behavior nanocomposite. Estimated for nanocomposites different Demonstrated crystallization analysis.

Language: Английский

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Hyperbranched Thiol-Capped Polyurethane: A Toughening Curing Agent for High-Performance Epoxy Adhesives

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Thermosetting epoxy resins are widely used in the fields of adhesives, coatings, electronic encapsulation, and aerospace. However, their inherent brittleness, due to high cross-link density, has limited application advanced, high-precision fields. To address this, we designed synthesized a series thiol-terminated branched polyurethanes with varying molecular weights act as curing agents for resins. This approach addresses issues like compatibility, dispersion, optimal mixing ratio associated adding separate toughening agents. By adjusting weight cross-linking density agent, optimized rate, chain mobility, toughness, adhesion resin. The cured adhesive demonstrated lap shear strength 27 MPa, tensile 47 fracture toughness 4.1 MPa m1/2, while also exhibiting broad substrate compatibility excellent solvent resistance. Compared conventional commercially available polysulfide agents, polyurethane-cured displays superior mechanical properties.

Language: Английский

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Novel frictional heat‐assisted mechanochemical residual curing of epoxy nanocomposites by silicon nitride nanofiller

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

Abstract The final properties of the epoxy (EP) based composites are influenced by hardener used and curing conditions. This study explores a novel mechanism in which nano‐silicon nitride (SiN) integration within matrix facilitates residual under cyclic abrasion tribological tests revealed that including 0.5 wt% SiN into EP improves wear resistance 192% quickly enables nanocomposite to achieve steady COF. Friction energy models modified Archard equation were employed assess stability specimens when subjected sliding. Raman spectroscopy prior‐ post‐worn surfaces confirmed nanofiller induces minimizes exposure new surface layers during test. Further analysis using FESEM with EDS DSC supports these findings. neat exhibited tribochemical mechanism, resulting significant oxide formation. In contrast, EP/SiN composite showed superior oxidation resistance, attributed an increased crosslinking density attained near‐to‐complete is credited for improved resistance. proposed introduces promising avenue research aimed at extending product lifespan sliding‐induced service. Highlights activates friction induced hotball mechanism. Fleishcher's model suggests enhanced thermal stability. indicated due nano thermograms prior post prove process EDAX absence layer formation nanocomposites.

Language: Английский

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Study on the Properties of Plastic Fillers in Carbon Dioxide Capture System Under High Temperature and High Pressure

Coatings, Journal Year: 2025, Volume and Issue: 15(3), P. 360 - 360

Published: March 20, 2025

In the CO2-amine solution system, metal packings in purification devices face corrosion risks, while plastic have garnered attention due to their lightweight nature, ease of processing, and excellent resistance. Since different varying applicable temperature ranges, exceeding tolerance limits can significantly reduce Therefore, selecting suitable at temperatures is crucial for ensuring safety. This study selected four materials–PVC-C, PP, FEP, PEEK–and systematically tested performance indicators, such as volume, mass, strength, elongation, thermal stability, a system experimental ranging from 60 130 °C. The results show that PEEK outperformed other three materials within 60–130 °C range, making it packing material high-temperature environments. Although FEP demonstrated good under same conditions, its tendency deform may limit applicability. PP PVC-C exhibited poor high temperatures, with particularly failing above 100 °C, rendering unsuitable applications. research provides important insights future selection systems devices.

Language: Английский

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A DETAILED INVESTIGATION INTO THE CURING KINETICS OF ZINC BORATE-EPOXY COMPOSITES

Solid State Sciences, Journal Year: 2025, Volume and Issue: 165, P. 107926 - 107926

Published: April 25, 2025

Language: Английский

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