Browsing by Author "RETAMAL, C"

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    THERMAL STUDIES OF METAL POLYSTYRENES .4.
    (1992) CARDENAS, G; RETAMAL, C; TAGLE, LH
    The thermal stability of metal polystyrene was determined by thermogravimetric analyses (TGA) from 25 to 250-degrees-C under nitrogen flow.
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    THERMAL-ANALYSIS OF METAL POLYACRYLONITRILES
    (1991) CARDENAS, G; RETAMAL, C; TAGLE, LH
    The thermal stabilities of metal polyacrylonitriles (MPAN) were studied by thermogravimetric analysis (TGA) between 25 and 550-degrees-C under nitrogen flowing at 10-degrees-C min-1. The metal contents of the polymers and their molecular weights are also reported. The kinetic data obtained by TGA showed that the thermostabilities of these polymers decrease in the order: Ge-PAN > Ga-PAN > Au-PAN > Sn-PAN > Bi-PAN > In-PAN > Pd-PAN > Sb-PAN. The experimental data suggest that the thermal stability of these polymers depends on the metal and the amount of metal incorporated. The reaction order for the one-step thermal decomposition of the polymers was found to be zero. The pre-exponential factor, the reaction order and the activation energies for the decomposition of the metal polyacrylonitriles were determined.
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    THERMOGRAVIMETRIC STUDIES OF METAL POLY(METHYL METHACRYLATES)
    (ELSEVIER SCIENCE BV, 1991) CARDENAS, G; RETAMAL, C; TAGLE, LH
    The thermal stabilities of metal poly(methyl methacrylate)s (PMMA) have been studied by thermogravimetry (TG) between 25 and 550-degrees-C under nitrogen flow. The kinetic data thus obtained show that the thermostabilities decrease in the order, Au-PMMA > Bi-PMMA > In-PMMA > Cu-PMMA > Ge-PMMA > Sb-PMMA > Pd-PMMA > Sn-PMMA > Ga-PMMA, suggesting that thermal stability is dependent upon the metal incorporated in the backbone. The order of reaction for the thermal decomposition of these metal polymers was found to be zero. The pre-exponential factor, the reaction order and the activation energy of the decomposition for metal poly(methyl methacrylates) have been determined and the reactions found to be zero order.