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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
Published on: March 8, 2019
Synthesis and chromatographic applications of polysiloxane-based stationary phase containing nitrogen heterocyclic
Xue Han1, Jingchen Liu1, Bing Wang1
1College of Chemistry and Chemical Engineering, Shandong University, 27 Shanda South Road, 250100, China.
Abstract:
In this work, a novel kind of stationary phase called 2,5-diphenyl-3,4-bis(pyridin-2-yl) phenyl grafted polysiloxane (DPPP, containing 16.0% 2,5-diphenyl-3,4-bis(pyridin-2-yl) phenyl group) was synthesized and statically coated inside fused-silica capillary column. The thermo-stability of DPPP was evaluated by thermogravimetric analysis (TGA) and the result indicated that DPPP did not decompose slightly until 380 °C. The chromatogram of the polyethylene pyrolysis products showed that the upper working temperature of the DPPP column was about 370 °C. The column efficiency of the DPPP column was 3500-3800 plates/m. McReynolds contants of the DPPP revealed that its polarity was moderate. Abraham system contants revealed that H-bond basicity was the major interaction of DPPP, followed by dipole-induced dipole interaction and dispersion force. In particular, compared to DB-17 column, the DPPP showed superiority on separating pyridine derivatives, aromatic aldehydes, and fatty alcohols.
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