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Abstract-In this paper we report the synthesis of a new hindered organosilicon derivative of styrene monomer, homo-polymer and co-polymers. This new monomer was synthesized from reaction of the lithiated derivative of para-methyl styrene with tris(trimethylsilyl)silylchloride in room temperature. Homo-polymerization or co-polymerization was done using a free radical polymerization method using α,α -azobis(isobutyronitrile) (AIBN) as a initiator. Incorporation of this bulky group to polymers showed a high glass transition temperature compared to polystyrene without this group. Monomer and polymers and compositions of poly(para-sisylmethylstyrene) in co-polymers was characterized by spectroscopy. Since, some important polymer properties have been modified by incoporating silyl groups, this work can be an important case in polymer chemistry.

Some silyl ethers of acetaminophen and methylsalicylate of general formula ArOSiRR 0 R 00 ArOH ¼ parahydroxyacetanilide or 2-hydroxybenzoic acid methyl ester; SiRR 0 R 00 ¼ trimethylsilyl, triethylsilyl, dimethyltert(Bu)silyl, triphenylsilyl, dimethylsilyl, tris(trimethylsilyl)silyl (sisyl) or dimethylvinylsilyl have been prepared and fully characterized. The compounds were prepared from the combination of either acetaminophen or methylsalicylate with the silyl chloride of these groups. Two methods were employed. In the first Et 3 N was used in THF to remove HCl in coupling the silyl group to the organic substrate. In the other method imidazole as a base in dimethylformamide (DMF) were used. The effect of the silyl groups in providing stability to the compounds preventing or enhancing hydrolysis of the silicon-containing group was determined. The compounds were characterized by: NMR, IR, mass spectroscopy and elemental analysis (CHN) methods.