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- 저자 : Lianwei Ye (검색결과 2 건)
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Lianwei Ye,Ke Wang,Hai Feng,Yu Wang 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
High-efficiency recycling of carbon fiber-reinforced epoxy resin-based composites is difficult because of theirthree-dimensional network structure. In this article, a benzyl alcohol/alkaline system was used to recycle carbon fiberreinforcedepoxy resin-based composites cured by an anhydride. The degradation rate, mechanical properties and degradationmechanism of the recycled carbon fiber were determined by gas chromatography-mass spectrometry, Fourier transforminfrared spectroscopy, liquid chromatography-mass spectrometry, scanning electron microscope and X-ray photoelectronspectroscopy. The experimental results indicated that there were two steps in benzyl alcohol/K3PO4 degradation system. Thefirst was transesterification by benzyloxy selective attack to give small-molecule esters. Then the esters were saponified bythe alkaline materials. After degradation, the stratification of resin and benzyl alcohol occurred, which was conducive to theirseparation. The optimal degradation time was 40 min under the weight ratio of alkaline material to benzyl alcohol of 1:10,atmospheric pressure, and temperature of 195 oC and the decomposition efficiency exceeded 90 %. A clean carbon fibersurface was obtained with an oxygen content comparable to that of the original carbon fiber. The tensile strength of therecycled carbon fiber was above 90 % of the original value.
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Zhong-yu Si,Zhong-xiao Sun,Lianwei Ye,Ai-jun Gao,Yu Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
In recent years, with the increasing demand for carbon fiber-reinforced polymer (CFRP), the recycling of its wastehas become a serious problem that restricts the wider application of CFRP. This study used a benzyl alcohol/NaOH system atatmospheric pressure to degrade the CFRP of epoxy-resin matrix cured by anhydride, and the influence of NaOH dosage ondegradation rate was investigated. The degradation mechanism of the resin was analyzed using Fourier transform infraredspectroscopy, gas chromatography-mass spectrometry and Electro-Spray Ionization-Mass Spectroscopy. The structure andproperties of the recycled carbon fibers were characterized using scanning electron microscopy, X-ray photoelectronspectroscopy and a monofilament tensile strength test. The experimental results indicated that the benzyloxy nucleophilicgroup produced by benzyl alcohol in alkaline conditions selectively attacked the cross-linking ester bond of the resin andbroke the c ross-linking point. Finally, the resin was degraded by removing the curing agent. When the m ass ratio of NaOH toCFRP (w(NaOH):w(CFRP)) was not under 1:1 and the reaction conditions were 190 °C, 1 h and atmospheric pressure, thedegradation rate of the resin reached 98.4 %. The degradation products of the resin were insoluble in benzyl alcohol andprecipitated, which was conducive to the recovery and reuse of the benzyl alcohol. The surface oxygen content of therecycled carbon fiber was similar to that of the original carbon fiber, and the tensile strength of recycled carbon fibermonofilament remained above 95 % of the original.
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