Synthesis And Adsorption Performances Of A New Chloromethyl Polystyrene Supported Validoxylamine A Amphiphilic Polymer Networks

Validoxylamine A, the aglycone of validamycin A, has secondary amino groups and many hydrophilic hydroxyl groups in the molecular structure. In this paper, validoxylamine A was prepared using sulfuric acid-catalyzed hydrolysis of validamycin A, based on the synthesis of hydrophobic macroporous crosslinked chloromethyl polystyrene networks(CMPS), a new intelligent chloromethyl polystyrene supported validoxylamine A amphiphilic polymer networks(VACMPS) was synthetized by chemical modification. It was an amphiphilic network because of hydrophobic benzene ring and hydrophilic hydroxies in the polymer microsphere. Using amphiphilic properties in the new adsorbent and amphiphilic structure in the adsorbate, their adsorption properties for vanillin, salicylic acid and resveratrol from Polygonum cuspidatum were investigated.1. A new intelligent chloromethyl polystyrene supported validoxylamine A amphiphilic polymer networks(VACMPS) was obtained form the amination reaction of macroporous crosslinked chloromethyl polystyrene(CMPS) with validoxylamine A into DMF. The structure of the new adsorbent was evaluated through analysis of the residual chlorine content, BET specific surface area, and FT-IR spectrum. All the experimental data indicated that validoxylamine A had grafted successfully to macroporous crosslinked chloromethyl polystyrene(CMPS).2. Adsorption behaviors of vanillin onto VACMPS were tested in aqueous solution. Compared the adsorption capacities of vanillin onto VACMPS with chloromethyl polystyrene supported ethanolamine amphiphilic polymer networks(EACMPS) and CMPS, it was found that the adsorption capacities of vanillin onto VACMPS was greatly improved. Further research on the adsorption mechanism indicated that hydrogen bonding-led, π-π staking and hydrophobic interaction participation were the main diving forces for the adsorption process for vanillin onto VACMPS in aqueous solution.3. Adsorption behaviors of salicylic acid onto VACMPS were tested in aqueous solution and normal hexane. At the same equilibrium concentration and temperature, by comparing the adsorption capacities for salicylic acid onto VACMPS with EACMPS and CMPS, it was shown that adsorption capacities for salicylic acid onto VACMPS was greater. Further investigation about the adsorption mechanism suggested that hydrogen bonding, π-π staking and hydrophobic interaction were the main diving forces for the adsorption process for salicylic acid onto VACMPS in aqueous solution, while the adsorption in normal hexane was primary due to hydrogen bonding.4. Adsorption behaviors of resveratrol from Polygonum cuspidatumonto VACMPS were studied in alcohol solution. Experiment results showed that adsorption capacity of from Polygonum cuspidatumonto VACMPS in alcohol solution approached34.18mg/g (wet resin), content of resveratrol from6.33%to38.24%.