H-Bonding Self-Assembled Template-Controlled Synthesis Of A Complete Ladder Polyvinylsiloxane

Research in microstructure-controllable ladderlike polymer is the advanced and interdisciplinary study for polymer science, supramolecular chemistry and material science. In this thesis, a novel high regularity m-phenylenediamino-Bridged Ladder Polyvinylsiloxane (addr. Vi-OLPS) was synthesized successfully by means of Supramolecular architecture-directed stepwise-coupling polymerization. Then ladderlike Polyvinylsiloxane (Vi-T) was prepared by the way of subsection hydrolysis , TEA as the catalyzer, to remove the m-phenylenediamine which act as a template. The structure of the polymer was characterized by FT-IR, X-ray diffraction ²⁹Si-NMR and DSC. The data show that both Vi-OLPS and Vi-T have ordered ladderlike molecular structure. The Vi-T has a comprehensive applied perspective in misalignment optical material and liquid-crystal display material, which provide a novel method to synthesize polymer and make it funtional.2,4-Dimethoxybenezoyl chloride was prepared by the reaction of 2,4-dihydroxybenezoyl acid, dimethyl sulfate and thionyl chloride by means of methylation and chlorination. The reaction was tracked by thin-layer chromatography(TLC). And the optimal reaction condition of chlorination determined by orthogonal design methods. The influence of several purification methods on the purity and productivity of the products was discussed. The experiment result showed when the method of recrystallization undergone in pertroleum ether (90～120℃) , the total yield reached 74.1%. And the structure of the product was characterized by FT-IR and ¹H-NMR. The 2,4-Dimethoxybenezoyl chloride could inarch to the Vi-T as a reactivity functional group to enhance the activity of the ladder ploymer.