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- 저자 : Mingcun Wang (검색결과 2 건)
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Mingcun Wang,Mathew Leitch,Chunbao Charles Xu 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.6
For the synthesis of biomass-based resol resins, cornstalk powders were liquefied in a hot-compressed phenol–water (1:4, wt./wt.) medium at 300–350 8C. It was observed that essentially no phenol was reacted with the cornstalk degradation intermediates during the liquefaction process. The cornstalkderived bio-oils contained oligomers of phenol and substituted phenols, originated primarily from the lignin component of the cornstalk feedstock. Using the cornstalk-derived bio-oils, resol resins were readily synthesized under the catalysis of sodium hydroxide. The biomass-derived resol resins were brown viscous liquids, possessing broad molecular weight distributions. In comparison with those of a conventional phenol resol resin, the properties of the bio-based resins were characterized by GPC, FTIR, DSC and TGA. The as-synthesized bio-oil resol resin exhibited typical properties of a thermosetting phenol–formaldehyde resin, e.g., exothermic curing temperatures at about 150–160℃, and an acceptable residual carbon yield of ca 56% at 700℃ for the cured material.
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Preparation, thermal cure and ceramization of liquid precursors of SiC–ZrC
Chuanjin Huang,Zhehui Wang,Mingcun Wanga 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Liquid PEPSI–PZO, as precursor of SiC–ZrC multi-component ceramic, was prepared by facile reactiveblending method, using phenylethynylpolysilane (PEPSI) as silicon and carbon source and polyzirconoxanesal(PZO) as zirconium source. The processing capability of PEPSI–PZO met the demands ofPrecursor-infiltration–pyrolysis technique (PIP) in ceramic composites fabrication. The thermal cure wasrealized at 130–330 8C by ethynyl polymerization and condensations. The thermal cure of PEPSI–PZOprecursor was promoted by catalyst Ni(acac)2, and the curing initiation and curing peak temperaturesdecreased by 25 and 70 8C, respectively. Evidenced by ceramic yields and XRD results, the thermalpyrolysis was catalyzed by Ni(acac)2, (ceramic yield was improved by 5–10%). XRD and SEM-EDS resultsshowed that SiC–ZrC by 1600 8C pyrolysis was highly crystalline, due to the occurrence of carbothermalreduction reaction. The liquid precursor of SiC–ZrC is an ideal candidate of low cost precursors for hightemperatureceramics and ceramic matrix composites.
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