By Taufiq Yap Yun Hin
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Extra resources for Advanced Materials and Engineering
The catalysts were characterized by FT-IR, SEM/TEM, elements analysis, TG/DSC and acid base titration. Experimental Catalyst preparation. Scheme 1 showed the synthetic process of PS-[SO3H-PMIM][HSO4] [10, 13]. 1g) and toluene (5mL) at 40 ℃. 01mol, –CH2Cl), prepared according to the previous report , in acetonitrile (15mL) was added to the formed imidazole sodium salt solution, the reaction was carried out at 65 ℃ for 48 h. The PS-CH2-imidazole product was ﬁltered off and washed by soxhlet extraction using ethanol as solvent and dried under vacuum.
Therefore the optimum reaction temperature is 80 oC. 0 Influence of the pH value. The pH value could affect both the hydrolysis and gelling of silicate. The sodium silicate would hydrolyze rapidly at a low pH value, which might lead to self-nucleation of silicate. 0. The relationship of gelling time with pH was following N curve . 4-b. 4-c. 0. Advanced Materials Research Vol. 10 mol/L sodium silicate solution, in 80 oC Conclusions The SiO2-coated α-Al2O3 pearlescent pigment was prepared by liquid phase deposition (LPD).
69mmol/g respectively. 30 PS-CH2-imidazole3 “VBC:St:DVB, vol%”was the feed composition of PS-CH2Cl beads. “VBC, St and DVB” are the abbreviation of “4-vinylbenzyl chloride, styrene and divinyl benzene” respectively. SEM/TEM and TG-DSC. It can be seen that PS-CH2Cl (Fig. 2 A and C) was uniform globular in the size of ~600 nm. After the introduction of [SO3H-PMIM][HSO4], the catalyst became big a little, about ~700nm and the surface became smooth (Fig. 2 B and D), which is in accord with other report .
Advanced Materials and Engineering by Taufiq Yap Yun Hin