Papers by Author: Xiao Chun Wang

Abstract: A γ-glycidyloxypropyltrimethoxysilane (GPTMS) modified titania hydrosol was prepared. The influence of GPTMS modification on the tatania sol was investigated by dimension dispersion, Zeta potential, FT-IR, and the ultraviolet transmittance of the treated PET fabric. The results show that the Zeta potential of nano-particles increased from 2.1mV to 35.6mV. And there was no obvious difference in dimension dispersion and FT-IR between the tatania gel and the modified-tatania gel. The ultraviolet transmittance of the PET fabric treated the modified-sol and the unmodified-sol also did not show significant shift.

Abstract: A novel Si/P flame retardant was prepared using tetraethyl orthosilicate (TEOS) and phosphoric acid (H₃PO₄). Cotton fabric treated with the flame retardant was characterized by cone calorimetry, thermogravimetric analysis (TGA), X-ray fluorescence spectroscopy, and Fourier transform infrared spectroscopy. The peak heat release rate (pHRR) and total heat release (THR) of the fabric treated with TEOS/H₃PO₄ are lower than those of the fabric treated with TEOS or H₃PO₄ alone. The HRR and THR of the treated fabric decrease from 145.66 kW/m² and 1.68 MJ/m² to 70.76 kW/m² and 0.67 MJ/m², respectively. Total smoke production decreases from 0.080 to 0.014 m²/m². TGA revealed that cellulose dehydration increases at low temperatures because of the addition of phosphoric acid and the production of charcoal. The generated charcoal is dense. The P and Si contents markedly increase, and exist in the charcoal in the form of P-O-C and Si-O bonds, respectively. On the basis of these results, we conclude that the main mechanism of TEOS/H₃PO₄ is that of a condensed-phase flame retardant. Good flame retardant synergism occurs between TEOS and H₃PO₄.

Abstract: In the present work, cone calorimetric technique has been widely used to study the flammability of polymer. But there are few reports about the cone calorimetric technique exploited for textile. The flammability of cotton fabrics selected in this study was tested by cone calorimeter. The factors, such as fabric layers, heat flux, whether subjoining grid, were discussed and the repeatability of cone calorimetric data was analyzed. In addition, Attempts had been made to establish the suitable methods for measuring the flammability of textiles by cone calorimeter.

Abstract: A Si/P flame retardant was prepared using tetraethyl orthosilicate (TEOS) and phosphoric acid (H3PO4). Original cotton fabric, treated fabric and its charcoal were examined by FT-IR, SEM, and EDS. Results showed that the TEOS/H3PO4 flame retardant has little affect on the cotton chemical structure and the surface morphology of cotton fiber. Main absorption peaks of the charcoal in the FT-IR are attributed to the P-O-C and the Si-O-Si bonds. And the surface of the charcoal was covered with white particles. EDS illustrates Si-O-Si bonds form on the surface and exhibit white particles in the SEM image.