Preparation of 3‐aminopropyltriethoxy silane modified cellulose microcrystalline and their applications as flame retardant and reinforcing agents in epoxy resin

Wang, Minghang; Yu, Ting; Feng, Zhang‐Qi; Sun, Jun; Gu, Xiaoyu; Li, Hongfei; Fei, Bin

doi:10.1002/pat.4863

Cited by 30 publications

(17 citation statements)

References 36 publications

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“…Among the chemical‐containing flame retardant, APP is preferred due to its high flame‐retardant performance 18,19 . Its capability to improve the flame retardancy of aerogels and polymer resins has been proven 20‐22 . Typically, APP can provide the acid source as well as blowing source, which are two fundamental factors in an intumescent flame‐retardant system 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Thermally induced fire early warning aerogel with efficient thermal isolation and flame‐retardant properties

Yuan

2021

Polymers for Advanced Techs

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Due to the energy‐saving demands in chemical industries and building fields, thermal isolation materials (TIMs) are widely used. The general exploitation of combustible TIMs calls for timely fire alerts as well as flame‐retardant modifications. This work provides a novel paradigm to address the issues simultaneously by preparing a multifunctional aerogel via a facile and environmentally friendly freeze‐drying method. With the doping of ammonium polyphosphate and graphene oxide (GO), cellulose nanofiber‐based aerogel exhibits excellent thermal‐isolating as well as flame‐retardant properties. The composite aerogel displays flameless pyrolysis as well as increased residue char. A fire‐warning detector is designed to reliably monitor the early fire. Based on the flame‐induced electrical resistance transformation characteristic of GO, it endows the composite aerogel with an ultra‐fast fire‐response time of ~2.6 s and a durable alarm signal. The flame‐retardant and fire‐alarm mechanisms are concluded. Overall, these results suggest that this composite aerogel has an enticing prospect in chemical industries and high‐rise buildings, which may lay the foundation for designing multifunctional TIMs. The modified aerogel broadens its application territory by intrinsic fire‐alarm characteristics, which covers the deficiency of delaying reaction as well as restricted application scenarios in traditional fire detectors.

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Section: Introductionmentioning

confidence: 99%

Thermally induced fire early warning aerogel with efficient thermal isolation and flame‐retardant properties

Yuan

2021

Polymers for Advanced Techs

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“…The characteristic bands of the epoxy resin appeared in all composites, at 3500, 2928–2863, 1600, 1510, 1460, and 1240 cm −1 , related to, respectively, ν C─H ox, ν C─H ar, ν ─C═C─ ar, ν C─C ar, ν C─N e ν ─C─O─C (ν: stretching; ox: oxirane; ar: aromatic) 26,28 . The spectra also show characteristic bands of the amine‐based hardener used at 1460 and 574 cm −1 21,22 …”

Section: Resultsmentioning

confidence: 85%

“…Barari et al 18 silanized CNF using trimethoxy‐octadecyl silane (TMOS), Yue et al 19 treated CNC with amino‐trimethoxysilane (APTMS), and Yeo et al 20 silanized CMF with triethoxy(3‐glycidylpropyl)silane (GPS). Regarding amino‐silane modification of MCC, Wang et al 21 studied the incorporation into epoxy of functionalized MCC allied with ammonium polyphosphate as a flame retardant. Furthermore, Bessa et al, 22 studied the influence of amino‐silane modified MCC on the curing kinetics, thermomechanical properties, and thermal degradation, of a benzoxazine resin.…”

Section: Introductionmentioning

confidence: 99%

Enhancing thermal and dynamic‐mechanical properties of epoxy reinforced by amino‐functionalized microcrystalline cellulose

Neves

Zattera

Amico

2021

J of Applied Polymer Sci

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In this study, microcrystalline cellulose (MCC) was chemically modified with 3‐(aminopropyl)triethoxysilane and added to epoxy to improve chemical, thermal and dynamic‐mechanical characteristics of the composites. The composites were manufactured aided by sonication with 1.0%, 2.5%, or 5.0% wt/wt of untreated MCC or amino‐functionalized MCC (MCC‐Si). The epoxy/MCC‐Si composites showed a decrease in the ─OH band by Fourier‐transform infrared spectroscopy, and X‐ray diffraction analysis indicated better dispersion. The incorporation of MCC‐Si in epoxy resin decreased the heat of reaction, increased activation energy values (Ea) and pre‐exponential factor (A), and did not affect thermal degradation. All conversion degree (α) versus temperature curves for the composites showed a sigmoidal shape. MCC‐Si composites showed better dynamic‐mechanical properties than the MCC counterparts, and the functionalization effect was evidenced in storage modulus (E') and loss modulus (E"). At 2.5% wt/wt of MCC‐Si content an increase of 119% in E' at the glassy region, 127% in E' at the rubbery region and 173% in E" was observed compared to the neat resin, whereas the Tg barely changed among samples. Good adhesion between the amino‐functionalized MCC and the epoxy matrix was observed at the fracture surface, evidencing that surface modification of MCC improves their chemical interaction.

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“…However, carbon nanotubes have the disadvantages of poor compatibility with polymer matrix and easy agglomeration 17 . Therefore, it is necessary to modify the surface of carbon nanotubes, and many different kinds of modifier can be used such as silane coupling agent, 18 polydopamine 19 and gelatin 20 …”

Section: Introductionmentioning

confidence: 99%

Preparation of flame retardant and conductive epoxy resin composites by incorporating functionalized multi‐walled carbon nanotubes and graphite sheets

Zhang

Jiang

Sun

et al. 2021

Polymers for Advanced Techs

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This work reports our recent efforts on the preparation of functionalized multi‐walled carbon nanotubes (f‐CNTs) and its application in improving the fire, conductive, and mechanical performance of epoxy resin (EP) composites in combination with graphite sheets (GSs). The addition of hybrid carbon nanomaterials can effectively improve the mechanical properties of epoxy. Consequently, when the mass fraction of f‐CNTs/GSs is 3.9 wt%, the limiting oxygen index (LOI) value is increased to 27.4%, and the tensile strength and notched impact strength of epoxy are increased by 33.5% and 44.8%, respectively. Increasing the content of carbon nanomaterials can further improve the flame retardancy and electrical conductivity of EP composites. For the sample containing 11.0 wt% f‐CNTs/GSs, the electrical conductivity is further increased to 1.7 × 10−3 S/cm, which can be regarded as conductive materials. The LOI value is reached to 28.6%, with peak heat release and total heat release reduced by 26.4% and 16.4%, respectively.

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Preparation of 3‐aminopropyltriethoxy silane modified cellulose microcrystalline and their applications as flame retardant and reinforcing agents in epoxy resin

Cited by 30 publications

References 36 publications

Thermally induced fire early warning aerogel with efficient thermal isolation and flame‐retardant properties

Thermally induced fire early warning aerogel with efficient thermal isolation and flame‐retardant properties

Enhancing thermal and dynamic‐mechanical properties of epoxy reinforced by amino‐functionalized microcrystalline cellulose

Preparation of flame retardant and conductive epoxy resin composites by incorporating functionalized multi‐walled carbon nanotubes and graphite sheets

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