Preparation and characterization of porous crosslinked microspheres of new aromatic methacrylates

Abstract

The aim of this work was to prepare a new group of aromatic methacrylate monomers, utilise them in preparation of porous microspheres and study the influence of their chemical structure on the textural properties of porous methacrylate microspheres. Polymeric microspheres were prepared by suspension-emulsion polymerisation of four aromatic monomers: methacryloiloxybenzene, 1,2-dimethacryloiloxybenzene, 1,3-dimethacryloiloxybenzene and 1,4-dimethacryloiloxybenzene with another crosslinking agent-trimethylolpropane trimethacrylate. Mass median diameters of obtained beads are in the range 22-35 lm. The polymerisation reactions were carried out in the presence of a pore forming diluent. The influence of the diluent system on the porous structure of microspheres was studied in detail. To determine the textural properties of the studied microspheres, nitrogen adsorption-desorption and inverse sized exclusion chromatography measurements were used. Specific surface area of the obtained microspheres achieves value from 185 to 510 m 2 /g. Since obtained polymeric materials can be used as chromatographic packings for HPLC their porous structure in a swollen state was investigated. Significant differences in the porous structure parameters for dry and swollen microspheres were observed.

Thermal properties of TRIM–GMA copolymers with pendant amine groups

“…7 Gram-Schmidt plot [1] and DTG curve [2] for TRIM-GMA1?A copolymer contain a considerable level of unreacted double bonds [25].They can undergo reaction of thermal polymerization as well as double bonds oxidation. What is more, exothermic reaction of thermal crosslinking of the epoxide groups with the carbonyl group of trimethylolpropane trimethacrylate can also occur.…”

Thermal and spectral analysis of copolymers with sulphur groups

“…After the reaction, the resulting precipitate was filtered off, and magnesium sulphate (25 g) was added to the filtrate. The obtained methacrylic derivative of thiophenol-S-phenyl 2-methylprop-2-enethioate, in the form of colourless liquid, was extracted with methylene chloride and purified on the chromatographic column (chloroform/hexane 80:20) [19]. Figure 1 shows the scheme of the synthesis.…”

TG/DSC/FTIR/QMS studies on the oxidative decomposition of terpene acrylate homopolymers

“…The acrylate monomers were prepared in the Department of Polymer Chemistry, UMCS laboratory according to the following procedure: 0.1 mol of geraniol, nerol or citronellol (Fluka) were reacted with 0.12 mol of acryloyl chloride (Fluka) under 0.12 mol of triethylamine (Fluka) as a catalyst in the presence of chloroform as a solvent. The reaction was carried out at 5°C for 1 h and then at room temperature for the next 1 h. After completion, the raw product was washed with 1 % Na 2 CO 3 , 10 % HCl and distilled water, dried over MgSO 4 and purified using a chromatographic column filled with silica gel (Merck) and chloroform as a solvent [28].…”