In-process thermochemical analysis of in situ poly (ethylene glycol methacrylate-co-glycidyl methacrylate) monolithic adsorbent synthesis
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Thermomolecular mechanisms associated with the synthesis of polymethacrylate monoliths are critical in controlling the physicochemical and binding characteristics of the adsorbent. Notwithstanding, there has been limited reported work on probing the underlining synthesis mechanism essential in establishing the relationship between in-process polymerization characteristics and the physicochemical properties of the monolith for tailored applications. In this article, we present a real-time thermochemical analysis of polymethacrylate monolith synthesis by free-radical polymerization to probe the effects on the physicochemical characteristics of the adsorbent. The experimental results show that an increase in the crosslinker monomer concentration from 30 to 70% resulted in a peak temperature increase from 96.3 to 114.3 °C. Also, an increase in the initiator (benzoyl peroxide) concentration from 1 to 3% w/v resulted in a temperature increase from 90.7 to 106.3 °C. A temperature buildup increases the kinetic rate of intermolecular collision associated with microglobular formation and interglobular interactions. This reduces the structural homogeneity and macroporosity of the polymer matrix. A two-phase reactive crystallization model was used to characterize the rate of monomeric reaction after initiation and microglobular formation from the liquid monomeric phase to formulate the theoretical framework essential for evaluating the kinetics of the polymer formation process.
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Acquah, C.; Danquah, Michael; Loo Chin Moy, Charles; Anwar, Mahmood; Ongkudon, C. (2017)The thermo-molecular mechanisms associated with free radical synthesis of polymethacrylate monoliths offer an effective pathway to tune their pore characteristics. In this work, thermogravimetric analyses were used for ...
Parametric investigation of polymethacrylate monolith synthesis and stability via thermogravimetric characterisationAcquah, C.; Danquah, Michael; Loo Chin Moy, Charles; Anwar, M.; Ongkudon, C. (2017)Polymethacrylate monoliths are synthetic adsorbents with macroporous and mesoporous interconnected channels that can be engineered to target the hydrodynamic features of a wide range of molecular species. However, rigorous ...
Roberts, M.; Ongkudon, C.; Forde, G.; Danquah, Michael (2009)Polymethacrylate monoliths, specifically poly(glycidyl methacrylate-co- ethylene dimethacrylate) or poly(GMA-co-EDMA) monoliths, are a new generation of chromatographic supports and are significantly different from ...