Effects of organophilic montmorillonite on hydrogen bonding, free volume and glass transition temperature of epoxy resin/polyurethane interpenetrating polymer networks

Jia, Qi; Zheng, Mingbo; Zhu, Yuchan; Li, J.B.; Xu, Cheng

doi:10.1016/j.eurpolymj.2006.10.016

Cited by 71 publications

(17 citation statements)

References 30 publications

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“…The dual-sized carbon fiber surface became smooth because the surface was coated with the secondary sizing layer. It may be expected that strong hydrogen bonds formed between epoxy and PU [ 42 ] contributed to binding the filaments together during dual-sizing process. The additionally sized surface was clearly found in both dual-sized carbon fiber cases.…”

Section: Resultsmentioning

confidence: 99%

Dual-Sizing Effects of Carbon Fiber on the Thermal, Mechanical, and Impact Properties of Carbon Fiber/ABS Composites

2021

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Dual-sizing effects with either epoxy or polyurethane (PU) on the thermal, mechanical, and impact properties of carbon fiber/acrylonitrile-butadiene-styrene (ABS) composites produced by extrusion and injection molding processes were investigated. The heat deflection temperature, dynamic mechanical, tensile, flexural, and impact properties of the composites reinforced with either (epoxy + epoxy) or (epoxy + PU) dual-sized carbon fiber were higher than those commercially single-sized with epoxy. The result indicated that the dual-sized carbon fiber significantly contributed not only to improving the heat deflection temperature and the storage modulus, but also to improving the tensile, flexural, and impact properties of carbon fiber/ABS composites. The highest improvement of the composite properties was obtained from the composite with (epoxy + PU) dual-sized carbon fiber. The improvement of the mechanical and impact properties was explained by the enhanced interfacial bonding between carbon fiber and ABS matrix and by the length distribution analysis of carbon fibers present in the resulting composites. The fiber–matrix interfacial behavior was qualitatively well-supported in terms of fiber pull-out, fiber breaking pattern, and debonding gaps between the fiber and the matrix, as observed from the fracture surface topography. This study revealed that the properties of carbon fiber/ABS composites prepared by extrusion and injection molding processes were improved by dual-sizing carbon fiber, which was performed after a commercial epoxy sizing process, and further improved by using PU as an additional sizing material.

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Section: Resultsmentioning

confidence: 99%

Dual-Sizing Effects of Carbon Fiber on the Thermal, Mechanical, and Impact Properties of Carbon Fiber/ABS Composites

2021

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“…41 When the weight ratio of FMWCNTs reached to 20%, the T g increased from 82.5°C to 117.7°C. The change of T g suggested the hydrogen bonding interaction between PAI/POMA and FMWCNTs was strengthened, 55 which could improve the dispersion of conductive fillers into the polymer matrix, as discussed below.…”

Section: Resultsmentioning

confidence: 98%

Conductivity enhancement of poly(amide-imide) composites based on the synergistic effect of poly(o-methoxyaniline) and functionalized multiwalled carbon nanotube

Fang

Wang

et al. 2020

Polymers and Polymer Composites

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A series of novel ternary conductive composites have been prepared by incorporating functionalized multiwalled carbon nanotubes (FMWCNTs) into the binary composites of poly(amide-imide) (PAI) and poly( o-methoxyaniline) (POMA) to further improve the conductivity of PAI composites. With increasing the weight ratio of FMWCNTs, the conductivity of PAI/POMA/FMWCNTs ternary composites has been significantly enhanced from 10−3 S m−1 to 90 S m−1, much higher than that of the sum of PAI/POMA and PAI/FMWCNTs binary composites. The enhanced conductivity is mainly ascribed from a much more intensive conductive network formed in the PAI/POMA/FMWCNTs ternary composites. It is found that the N–H bending of amide group in the Fourier transform infrared spectrometry spectra is observed at 3298 cm−1 for PAI, 3296 cm−1 for PAI/POMA binary composites, and further blue shifted to 3292 cm−1 for PAI/POMA/FMWCNTs ternary composites. Moreover, the glass transition temperature has been increased from 82.5°C to 117.7°C. These results suggested that the hydrogen bonding interaction has been strengthened among PAI, POMA, and FMWCNTs, which is useful for dispersion of condcutive fillers into the polymer matrix.

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“…T g is a significant parameter for the thermoset epoxy resins, and in most applications, the working temperature of epoxy-based materials is below their T g . 20,21 The glass transition of cured EP and BEP was determined by DSC. The DSC curves of all the cured samples are shown in Figure 3, and the T g of each cured sample is marked in Figure 3.…”

Section: Dsc Analysismentioning

confidence: 99%

Synthesis and characterization of a liquid oxygen-compatible epoxy resin

Liu

et al. 2014

High Performance Polymers

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The bromine element was introduced into an epoxy resin to improve the liquid oxygen compatibility of the epoxy resin. After curing using 4,4′-diamino diphenylmethane, the liquid oxygen compatibility of all specimens was measured by the liquid oxygen mechanical impact test (ASTM D2512-95). The results suggested that the bromine-modified epoxy resin (BEP) was compatible with liquid oxygen, whereas the bisphenol F epoxy resin (EP) had poor liquid oxygen compatibility. The results of thermogravimetric analysis indicated that the incorporation of tetrabromobisphenol A into EP could accelerate the second-stage thermal degradation of BEP, leading to improvement of the liquid oxygen compatibility. X-ray photoelectron spectroscopy analysis indicated that the C–C/H groups on the surface of specimens could be oxidized to C–O–H/C and C=O groups during the impact process. The mechanism of bromine enhancement on the liquid oxygen compatibility of epoxy resin is proposed.

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Effects of organophilic montmorillonite on hydrogen bonding, free volume and glass transition temperature of epoxy resin/polyurethane interpenetrating polymer networks

Cited by 71 publications

References 30 publications

Dual-Sizing Effects of Carbon Fiber on the Thermal, Mechanical, and Impact Properties of Carbon Fiber/ABS Composites

Dual-Sizing Effects of Carbon Fiber on the Thermal, Mechanical, and Impact Properties of Carbon Fiber/ABS Composites

Conductivity enhancement of poly(amide-imide) composites based on the synergistic effect of poly(o-methoxyaniline) and functionalized multiwalled carbon nanotube

Synthesis and characterization of a liquid oxygen-compatible epoxy resin

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