Thermal degradation of Pb(Zr0.53Ti0.47)O3/poly(vinylidene fluoride) composites as a function of ceramic grain size and concentration

Poly(vinylidene fluoride)/Pb(Zr0.53Ti0.47)O3,([PVDF]1−x/[PZT]x) composites of volume fractions x and (0–3) type connectivity were prepared in the form of thin films. PZT powders with average grain sizes of 0.2, 0.84, and 2.35 μm in different volume fraction of PZT up to 40 % were mixed with the polymeric matrix. The influence of the inorganic particle size and its content on the thermal degradation properties of the composites was then investigated by means of thermo-gravimetric analysis. It is observed that filler size affects more than filler concentration the degradation temperature and activation energy of the polymer. In the same way and due to their larger specific area, smaller particles leave larger solid residuals after the polymer degradation. The polymer degradation mechanism is not significantly modified by the presence of the inorganic fillers. On the other hand, an inhibition effect occurs due to the presence of the fillers, affecting particularly the activation energy of the process.

Tribunal Constitucional: hora de cortar nas PPP’s, contratos futuros-swap…

Veja-se aliás a recente indagação formal da Procuradoria-Geral da República junto do Governo para colocar, se necessário for, em Tribunal, todos os contratos futuros swap. A maior parte dos quais com fortes prejuízos para o Estado português. Vide art.s 227º, 334º, 437º, 762º, entre outros, do Código Civil português. Abstract: See moreover the recent formal inquiry of the Attorney General's Office with the Government to place, if necessary, in court, all future swaps. Most of them with heavy losses to the Portuguese State. See art.s 227, 334, 437, 762º, among others, the Portuguese Civil Code.

Tribunal de Contas: defesa do dinheiro público também no caso-BES

Numa altura em que continuam em vigor uma série de misteriosos e injustos contratos de PPP’s, contratos futuros-swap e rendas artificiais outorgadas a lucrativos grupos económicos – e mais desfavoráveis às contas do Estado e contribuintes, como várias instituições e personalidades têm alertado em público incluindo a imprensa internacional -, a defesa dos dinheiros públicos assume cada vez maior importância. Abstract: At a time when still in force a series of mysterious and unjust PPP contracts, future swap contracts and artificial rents granted to profitable economic groups - and more unfavorable to the state and taxpayers of all, as several institutions and personalities have warned in public including the international press - the defense of public money is increasingly important.