Synthesis and Characterization of UV-Curable Poly(dimethylsiloxane) Dimethacrylate

This paper presents a new route to the synthesis of UV-curable poly(dimethylsiloxane) dimethacrylate (PDMSDMA). PDMSDMA was essentially prepared by modification of poly(dimethylsiloxane), bis(3-aminopropyl) terminated (PDMS-NH₂) with methacrylic anhydride (MAA). The synthesized products were cured under UV in the presence of camphorquinone (CQ) used as a photoinitiator. The chemical structure of PDMSDMA samples was analyzed by FT-IR and ¹H-NMR spectroscopy. The ¹H-NMR spectrum of PDMSDMA revealed new peaks at 3.20 ppm, corresponding to methylene protons in ? CH₂? NH? , and 5.25 and 5.65 ppm, corresponding to vinylic protons in ? NH? CO? CCH₃?CH₂. The chemical structure of the cured products and the degree of curing were determined by solid state ¹³C CP/MAS NMR and FT-IR (Micro-ATR) spectroscopy. Various parameters, such as concentration of methacrylic anhydride, amount of camphorquinone, and curing time, were studied.