Investigation of Thermal Behaviors of Poly(3-Chloro-2-Hydroxypropyl Methacrylate) modified with Amine-Rich Groups

Abstract

Poly(3-chloro-2-hydroxypropyl methacrylate) (p(HPMA-Cl)) microgels was synthesized through surfactant-free emulsion polymerization technique (SFEP) by addition of ethylene glycol dimethacrylate (EGDMA) as a cross-linker. Then, p(HPMA-Cl) microgel was modified by using tris(2-aminoethyl)amine (TAEA) and poly(ethyleneimine) (PEI) as modifying agents. After modification, the synthesized microgels were named as poly(3-chloro-2-hydroxypropyl methacrylate)-tris(2-aminoethyl)amine (p(HPMA)-TAEA) and poly(3-chloro-2hydroxypropyl methacrylate)-poly(ethyleneimine) (p(HPMA)-PEI) microgels. Thermal decomposition kinetics of microgels based on the p(HPMA-Cl) were evaluated using thermogravimetric analysis. The kinetic parameters for the degradation reactions of p(HPMA-Cl)-based microgels, including the correlation coefficients, activation energy and mechanisms, were determined from TGA-DTA data. Experimental data for p(HPMA-Cl), p(HPMA)-TAEA and p(HPMA)-PEI microgels were computed through twenty four different thermal degradation models to evaluate the best fitted model. The activation energies (Ea) of p(HPMA-Cl), p(HPMA)-TAEA and (p(HPMA)-PEI) microgels composites determined by the Kissinger-Akahira Sunose (KAS), Flynn-Wall-Ozawa (FWO), Coats-Redfern, Ozawa and Friedman methods. It was apparently concluded that nucleation-nuclei growth models was suitable for these microgels.