Polímeros: Ciência e Tecnologia
http://revistapolimeros.org.br/article/doi/10.1590/0104-1428.12416
Polímeros: Ciência e Tecnologia
Original Article

Effect of heat cycling on melting and crystallization of PHB/TiO2 compounds

Nichollas Guimarães Jaques; Ingridy Dayane dos Santos Silva; Manoel da Cruz Barbosa Neto; Andreas Ries; Eduardo Luis Canedo; Renate Maria Ramos Wellen

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Abstract

Abstract: Compounds of poly(3-hydroxybutyrate) (PHB) and titanium dioxide (TiO2) with filler content between 1% and 10% were prepared in a laboratory internal mixer. The effect of heating and cooling rates on the crystallization and melting of PHB/TiO2 compounds was investigated by differential scanning calorimetry (DSC). Melt and cold crystallization rates rise with increasing cooling/heating rates. A higher cooling rate translates to a lower melt crystallization temperature, while a higher heating rate results in a higher cold crystallization temperature. TiO2 promotes melt crystallization of PHB, behaving as a nucleant agent. The total crystallinity developed after melt and cold crystallization decreases for low levels of TiO2, i.e. 2% per weight, and is almost independent of the heating/cooling rate. The melting temperatures and rates are minimally affected by both the heating rate and filler content. The results suggest that the desired PHB microstructure can be controlled by filler content and adjusted heating/cooling rate.

Keywords

crystallization, DSC, melting, PHB, titanium dioxide

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