Papers by Author: Yu Sun

Abstract: Boric acid and glycerol were adopted as the starting materials to react with cation exchange resin (CER) as the catalyst. The conversion of the products was characterized by acid value, titrated by potassium hydroxide (KOH) ethanol solution. It showed that the yield of the optimum products got to about 89%. Then they were modified with EO, gaining more than four carbon chains, and hydrolytic time was prolonged to 48 h. The structures of the unmodified and modified products were further confirmed by IR. The results indicated that hard hydrolytic borate ester surfactants with C-O-C bond were synthesized.

Abstract: In this article, acrylic fiber which was from factory production lines was chosen as samples. The method consisted of extraction of Diethyl Formamide (DMF) via using solid-liquid extraction technique and Gas Chromatograph (GC) analysis. DMF in acrylic fiber were extracted by distilled water, separated though DB-17 capillary column and detected by Flame Ionization Detector (FID). By means of external standard method quantitative analysis was accurately investigated. Detection limit was 3 ppm and recovery rate of DMF was in the range of 94% and 98%. These results showed that this test method was of high precision and sensitivity, which achieved the enterprise production requirements.

Abstract: Polyurethane (PU) prepolymer with the isocyanine-based were synthesized by toluene -2, 4-diisocyanate (TDI), polyethylene glycol (PEG-400) and polyethylene glycol (PEG-1000) with N-methylpyrrolidone as the solvent. The effects of temperature and time on the synthesis of polyurethane prepolymer were examined in this paper. The structures of PU, unmodified epoxy resin and modified epoxy resin were identified by FI-IR spectra. It was shown that polyurethane prepolymer was synthesized at 70°C for 5 hours and modified epoxy resin was synthesized successfully.

Abstract: Dodecyl polyglucoside was synthesized by glucose and dodecanol using P-toluenesulfonic acid as catalyst. The effects catalyst type, proportion of material, reaction temperature and pressure were discussed in this paper. The most appropriate reaction conditions: mole ratio of laurel alcohol and glucose 6:1, mass of ratio of P-toluenesulfonic and glucose 0.008:1, reaction temperature 120°C and reaction pressure 5.0kPa.