Epoxy polymers reinforced with carbon microfibre wastes

Dias, Thaís da Costa; Panzera, Túlio Hallak; Santos, Júlio César dos; Freire, Rodrigo Teixeira Santos; Thomas, Carlos; Scarpa, Fabrizio

doi:10.1016/j.matpr.2019.02.027

Cited by 6 publications

(2 citation statements)

References 8 publications

(13 reference statements)

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“…Notably, substantially higher elastic modulus values (2.1–2.3 GPa) were achieved for DGEBA‐ and BEDB‐based formulations at 2 wt% phosphorus (the maximum concentration investigated) relative to the networks without DMMP. Typically, this degree of elastic modulus enhancement relies on rigid inorganic fillers or fiber reinforcement; [ 35,36 ] however, improvements in these networks result from added DMMP, which is liquid at room temperature. These results suggest that DMMP facilitates intermolecular interactions within the polymer network which, in turn, provides resistance to deformation.…”

Section: Resultsmentioning

confidence: 99%

Combining Mechanical Fortification and Ultralow Flammability in Epoxy Networks

Saraf

Stubbs

et al. 2020

Macro Materials & Eng

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Multifunctional organophosphorus additives present opportunities to engineer epoxy networks with both enhanced mechanical properties and ultralow flammability. This paper describes a systematic investigation of the effect of dimethyl methylphosphonate (DMMP) on the mechanical and heat release properties of both conventional and inherently low flammability epoxy resins. The findings demonstrate that integration of DMMP into epoxy networks produces materials with outstanding flame retardance and increased stiffness. Thermogravimetric analysis of DMMP‐containing networks show that DMMP promotes considerable char formation, with char residue reaching very high levels, up to 55%, for DMMP‐containing deoxybenzoin networks. Microscale combustion calorimetry of all the DMMP‐containing networks exhibit 50% lower heat release capacity and total heat release rate values relative to formulations without DMMP. Moreover, vertical burn tests demonstrate that DMMP‐containing formulations burn slowly and self‐extinguish. Morphological analysis of the charred DMMP‐containing formulations shows a porous structure and mechanical characterization reveals 50% higher elastic modulus, and comparable yield stress, for networks containing DMMP relative to those without DMMP. Overall, this organophosphorus additive represents an opportunity to combine materials chemistry with mechanical enhancement mechanisms to achieve low heat release properties without the need for halogenated flame‐retardant additives.

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Section: Resultsmentioning

confidence: 99%

Combining Mechanical Fortification and Ultralow Flammability in Epoxy Networks

Saraf

Stubbs

et al. 2020

Macro Materials & Eng

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“…Due to the inherent high strength and toughness of thermoset composites, they can further confer high compression and corrosion resistance 193 to building materials when pulverized 188,189,193 or chopped into certain shapes. 192 Panzera 196 studied the incorporation of waste carbon microfibres (CMF) derived from the cutting process of laminated composites into epoxy polymers of various mass fractions (0, 2.5, 5, 7.5, and 10 wt%). The addition of CMF resulted in a gradual increase in tensile (compressive) modulus to 36.6% (28.6%).…”

Section: Recycling Of Bio-based Hyperbranched Epoxy Resinsmentioning

confidence: 99%

Bio-based hyperbranched epoxy resins: synthesis and recycling

Jiang,

Li,

et al. 2024

Chem. Soc. Rev.

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Recyclable Technology of Thermosetting Resins for High Thermal Conductivity Materials Based on Physical Crushing

Zhong,

Xie,

Gou

et al. 2024

Energy & Environ Materials

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Epoxy resin, characterized by prominent mechanical and electric‐insulation properties, is the preferred material for packaging power electronic devices. Unfortunately, the efficient recycling and reuse of epoxy materials with thermally cross‐linked molecular structures has become a daunting challenge. Here, we propose an economical and operable recycling strategy to regenerate waste epoxy resin into a high‐performance material. Different particle size of waste epoxy micro‐spheres (100–600 μm) with core‐shell structure is obtained through simple mechanical crushing and boron nitride surface treatment. By using smattering epoxy monomer as an adhesive, an eco‐friendly composite material with a “brick‐wall structure” can be formed. The continuous boron nitride pathway with efficient thermal conductivity endows eco‐friendly composite materials with a preeminent thermal conductivity of 3.71 W m−1 K−1 at a low content of 8.5 vol% h‐BN, superior to pure epoxy resin (0.21 W m−1 K−1). The composite, after secondary recycling and reuse, still maintains a thermal conductivity of 2.12 W m−1 K−1 and has mechanical and insulation properties comparable to the new epoxy resin (energy storage modulus of 2326.3 MPa and breakdown strength of 40.18 kV mm−1). This strategy expands the sustainable application prospects of thermosetting polymers, offering extremely high economic and environmental value.

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Epoxy polymers reinforced with carbon microfibre wastes

Cited by 6 publications

References 8 publications

Combining Mechanical Fortification and Ultralow Flammability in Epoxy Networks

Combining Mechanical Fortification and Ultralow Flammability in Epoxy Networks

Bio-based hyperbranched epoxy resins: synthesis and recycling

Recyclable Technology of Thermosetting Resins for High Thermal Conductivity Materials Based on Physical Crushing

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