Chemical recycling of carbon fibre composites using alcohols under subcritical and supercritical conditions

Piñero-Hernanz, Raúl; García-Serna, Juan; Dodds, Chris; Hyde, Jason R.; Poliakoff, Martyn; Cocero, Marı́a José; Kingman, S.W.; Pickering, Simon; Lester, Edward

doi:10.1016/j.supflu.2008.02.008

Cited by 227 publications

(133 citation statements)

References 19 publications

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“…The variations of crosslink density in the early period of exposure (and the associated changes of thermo-mechanical properties) are important in aging problems. In addition, knowing the degelation point and the characteristics of the soluble fraction can be very useful in the chemical recycling of polyesters, especially in nearcritical water (11)(12)(13)(14)(15) , or for delignification in paper processing (16)(17)(18) .…”

Section: Introductionmentioning

confidence: 99%

Crosslink Density Changes during the Hydrolysis of Tridimensional Polyesters

Richaud

Pierre

Coquillat

et al. 2014

Macro Theory & Simulations

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The hydrolysis of almost ideal networks based on macrodiols (poly(adipate of ethylene glycol)) of average molar mass about 2 kg/mol, with L=18 ester groups per chain has been studied. Tensile testing was used to evaluate the crosslink density through the statistical theory of rubber elasticity at two temperatures and three values of relative humidity. A kinetic model for ester consumption including an autocatalysis term was proposed and combined with two original approaches for modeling the crosslink density changes. This allowed kinetic parameters of hydrolysis to be determined, and very good predictions were obtained for the variations of crosslink density (or elastic modulus) in the three aging conditions considered.The initial curvature of elastic modulus vs. time was predicted positive for weak autocatalysis and negative for strong autocatalysis. The obtained conversion ratio at degelation was found to decrease sharply with the number of esters per elastically active chain.

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Section: Introductionmentioning

confidence: 99%

Crosslink Density Changes during the Hydrolysis of Tridimensional Polyesters

Richaud

Pierre

Coquillat

et al. 2014

Macro Theory & Simulations

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“…Additionally, the pressure of sc-isopropanol is about 2 MPa less than that of methanol and water, probably as the molecule of isopropanol has 3 atoms of carbon and a higher solvation capacity to attack to the polymer more effective [20]. Fig.…”

Section: Product Yieldsmentioning

confidence: 97%

“…Piñero-Hernanz et al [20] suggested that the degradation of polymer in supercritical solvents relied on two main steps as reaction and dissolution of polymer in the solvent, therefore the solvation capability of the solvent will be an important parameter. Polarity of the solvent was thought to be related to the solvation capability.…”

Section: Product Yieldsmentioning

confidence: 99%

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Degradation of brominated flame retardant in computer housing plastic by supercritical fluids

Wang

Zhang

2012

Journal of Hazardous Materials

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“…In recent years, supercritical fluid is focused as an effective medium for the conversion of waste materials into resources [11][12][13][14][15][16]. Supercritical fluid is the substance whose temperature and pressure are over its critical points.…”

Section: Introductionmentioning

confidence: 99%

Materials recovery from waste printed circuit boards by supercritical methanol

Xiu

Zhang

2010

Journal of Hazardous Materials

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a b s t r a c tThe recovery of valuable materials from waste printed circuit boards (PCBs) is quite difficult due to the heterogeneous mix of polymer materials, multiple kinds of metals and glass fiber. A feasibility study was conducted using supercritical methanol (SCM) to simultaneously recover polymers and metals from waste PCBs. The study focused on the characteristics of both oils and solid products obtained from the SCMtreated waste PCBs. The operation conditions were temperature range of 300-420• C, treatment time between 30 and 120 min and solid-to-liquid ratio (S/L) of 1:10-1:30 (g/mL) so as to understand the products and depolymerization mechanisms of waste PCBs in SCM. GC-MS results revealed that the oils mainly contained phenol and its methylated derivatives, and the methylated derivatives increased with the increase of reaction temperature. The methylated reaction occurred mainly above 400• C. The liquid products also contained a significant number of phosphated fire retardant additives such as triphenyl phosphate, which decreased significantly with the increase of reaction temperature. The solid product mainly consisted of Cu, Fe, Sn, Pb and Zn, as well as lower concentrations of precious metals such as Ag and Au.

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Chemical recycling of carbon fibre composites using alcohols under subcritical and supercritical conditions

Cited by 227 publications

References 19 publications

Crosslink Density Changes during the Hydrolysis of Tridimensional Polyesters

Crosslink Density Changes during the Hydrolysis of Tridimensional Polyesters

Degradation of brominated flame retardant in computer housing plastic by supercritical fluids

Materials recovery from waste printed circuit boards by supercritical methanol

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