![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Metal poly(styrene-co-butyl methacrylates) copolymers were obtained by radical polymerization with benzoyl peroxide (BPO) and azodiisobutylonitrile (AIBN). The monomers were codeposited with the metals: Pd, Cu, Ag, Au, Zn, Cd, Ga, In, Ge, Sn, Sb and Bi at 77 K. The metals were evaporated to produce atoms and with the monomers they can generate a matrix on the reactor walls at low temperature. During the warm up process, metal co-monomers colloids can be obtained. The colloids were polymerized with BPO and AIBN at 65°C for 3.0 h. Four different initiator concentrations (1, 1.5, 3.0 and 5.0 mol%) were used. The yields are fairly low (30–60%) and the viscosimetric molecular weight range from 104–105 g/mol.
The higher Mv are Ga-SBMA and Ag-poly(styrene-co-butyl methacrylate) for AIBN series and Sn-SBMA and Pd-SBMA for BPO series. The thermal stabilities of these metal polymers have been studied by thermogravimetry (TG) between 25 and 550°C under nitrogen flow. The decomposition temperatures were obtained from the first derivative from TG curve.
The kinetic parameters of the thermal decomposition were determined by the Arrhenius equation. All these copolymers degrade in a single step process around 300°C. The kinetic data thus obtained show the thermostabilities decrease in the order: Cu-SBMA > Ge-SBMA > Ag-SBMA > In-SBMA > Zn-SBMA > Bi-SBMA > Ga-SBMA > Cd-SBMA > Sb-SBMA > Sn-SBMA > Pd-SBMA for AIBN series and Ga-SBMA > Ag-SBMA > Au-SBMA > In-SBMA > Ge-SBMA > Zn-SBMA > Sn-SBMA > Bi-SBMA > Cd-SBMA > Pd-SBMA > Cu-SBMA > Sb-SBMA for BPO series.
The thermal stability is strongly dependent on the metal cluster incorporated in the polymer matrix. The decomposition reaction order is zero either for AIBN or BPO series of metal copolymers. The pre-exponential factor and the activation energy of the decomposition reaction for all the copolymers have been determined.