Morphological and thermal analyses of flexible polyurethane foams containing commercial calcium carbonate

Abstract

One filler often utilized in flexible polyurethane foams is calcium carbonate (CaCO3) because it is non-abrasiveness, non-toxicity and facilitated pigmentation. However, it is observed that the excess of commercial CaCO3 utilized in industry possibly causing permanent deformations and damaging the quality of the final product. The effect of different concentrations of commercial CaCO3, in flexible foams, was studied. Different concentrations of CaCO3 were used for the synthesis of flexible polyurethane foams, which were submitted to morphological and thermal analyses to verify the alterations provoked by the progressive introduction of this filler.

Effect of Polyethylene-Grafted Maleic Anhydride (PE-g-MAH) on Properties of Low Density Polyethylene/Eggshell Powder (LDPE/ESP) Composites

“…This result shows that higher filler loading give composites with more thermal stability than lower filler loading. The similar observation was reported by other researchers, [17][18][19][20] due to the presence of large content of inorganic materials in the composites.…”

The Effect of NCO-Polyol on the Properties of Low-Density Polyethylene/Water Hyacinth Fiber (Eichhornia crassiper) Composites

“…This result shows that higher filler loading give LDPE=WHF composites with more thermal stability than lower filler loading. A similar observation was reported by other researchers [10,11] . It can be seen that the temperature of 1% weight loss (T À1%wt ), final decomposition temperature (FDT), and residual mass of modified LDPE=WHF composites are higher than unmodified LDPE=WHF composites.…”

Estudo da influência de tratamentos químicos da fibra de sisal nas propriedades de compósitos com borracha nitrílica

“…Até cerca de 350 °C, a adição de carbonato de cálcio não influenciou de forma significativa a estabilidade térmica dos materiais obtidos, sendo que o processo de degradação observado a partir de 350 °C é devido a decomposição da borracha, das fibras e à hidrofilicidade do carbonato. O carbonato de cálcio comercial apresenta temperatura de início de decomposição em 600 °C, liberando CO 2, gerando CaO com conteúdo final de resíduo de cerca de 63%, resultados semelhantes para compósitos com carbonato são relatados na literatura [23][24][25] . A partir dos resultados obtidos nas análises de TG vê-se que as temperaturas usadas nos tratamentos das fibras e na obtenção das mantas dos compósitos (máximo de 135 °C) são inferiores às temperaturas de degradação destes materiais, podendo ser usados para o seu processamento.…”