|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 19 van 20 gevonden artikelen
| Titel: |
Thermal Studies of Metal Poly(4-methyl styrene-co-styrene) with BPO. Part XVII |
| Auteur: |
Galo, Cardenas T. Elizabeth, Salgado C. Marcela, Gonzalez G. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 32 (1996) nr. 1-4 pagina's 163-171 |
| Jaar: |
1996-02-01 |
| Inhoud: |
Metal poly(4-methyl styrene-co-styrene) copolymers were obtained by radical polymerization with benzoyl peroxide. The monomers were cocondensed simultaneously with the metals: Pd, Cu, Ag, Au, Zn, Ga, In, Ge, Sn, Sb, and Bi. The metals were evaporated to produce atoms and with the monomer they can generate a matrix at 77 K. After the warm up process, metal comonomer colloids can be obtained. The colloids were polymerized with benzoyl peroxide at 70°C for 0.5 h at 70°C. Four different initiator concentrations (0.1, 0.5, 1.0 and 2.5 mol%) were used. The yields are around 25% and the viscosimetric molecular weight ranges from 104-105 g/mol. The higher Mv are Ag, Ga and Sn-poly(4-methyl styrene-co-styrene). The thermal stabilities of these metal polymers have been studied by thermogravimetry (TG) between 25 and 550°C under nitrogen flow. The decomposition temperature was obtained from the maximum of 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 around 300°C. The kinetic data thus obtained show the thermostabilities decrease in the order: Ga-(4-MeS-S) > Sb-(4-MeS-S) > Ge-(4-MeS-S) > In-(4-MeS-S) > Zn-(4-MeS-S) > Ag-(4-MeS-S) > Pd-(4-MeS-S) > Cu-(4-MeS-S) > Sn-(4-MeS-S) > Au-(4-MeS-S) > Bi-(4-MeS-S). The thermal stability is depending upon the amount and metal incorporated in the polymer matrix. The decomposition reaction order is zero and we are in the presence of a single decomposition reaction. The pre-exponential factor, the activation energy, the reaction order and the decomposition temperature for all the copolymers have been determined. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 19 van 20 gevonden artikelen
| << vorige | volgende >> |