Novel method reveals swelling and slow release processes in gels formed by free radical copolymerization, suggesting potential applications in drug delivery.
A novel method based on steady state fluorescence (SSF) measurements is introduced for studying slow release and swelling processes in gels formed by free radical crosslinking copolymerization (FCC) of methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDM) in toluene. Gels were prepared at 75°C with various toluene contents with pyrene (P y ) as a fluorescence probe. After drying these gels, slow release and swelling experiments were performed in toluene at 50°C by real-time monitoring of the pyrene fluorescence intensity. Li-Tanaka and Fickian type equations were used to obtain swelling and slow release parameters. It was observed that slow release takes place after the gel is swollen. Cooperative and desorption (slow release) diffusion coefficients (D c and D) were measured and found to be 10 -6 cm 2 s -1 in both cases.
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Pekcan et al. (1997) studied this question.
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