نتایج جستجو برای: phenolic resin
تعداد نتایج: 54548 فیلتر نتایج به سال:
In this research, solid state carbothermal synthesis of HfB2 Nano powders was investigated. For this purpose, HfO2,H3BO3, carbon active or phenolic resin were used as raw materials for carbothermal reaction. After 2-4 hours of milling the raw materials by a planetary ball in an ethanol media, the mixture was heat dried and pressed in to disks under pressure of 20-30 bar. The disks were then pla...
To provide a high-strength, non-resin organic plugging agent for water shutoff in carbonate fracture and cave reservoirs, high-strength gel was prepared with polyvinyl alcohol 1788 as gelant p-phthalaldehyde crosslinker this study. By selecting latent acids rather than strong acid such hydrochloric sulfuric catalysts, by adding clay sulphonated phenolic resin stabilisers to the gelation, drawba...
Solid-phase microextraction (SPME) coupled to high-performance liquid chromatography (HPLC) has been applied to the analysis of priority pollutant phenolic compounds in water samples. Two types of polar fibers [50 microm Carbowax-templated resin (CW-TPR) and 60 microm polydimethylsiloxane-divinylbenzene (PDMS-DVB)] were evaluated. The effects of equilibration time and ionic strength of samples ...
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