A simple and efficient technique to prepare aromatic polyhydroxibutirate/polybutylene adipate terephthalate blends
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A simple and efficient technique to prepare aromatic polyhydroxibutirate/polybutylene adipate terephthalate blends Vagner Roberto Botaro1,2 · Roberta Ranielle Matos de Freitas2 · Karina Palmizani do Carmo2 · Ivan Freitas Raimundo1 Received: 11 May 2020 / Revised: 17 August 2020 / Accepted: 23 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Polyhydroxybutyrate (PHB) is a biodegradable polymer, and preparation of a blend with another biodegradable polymer, polybutylene adipate terephthalate or Ecoflex® (ECO) is described. Some works in the previous literature show the possibility of preparing blends involving both. The techniques normally used previously described normally an extrusion process or even mixers that require high investment such as HAAKE Rheomix, for example. The main contribution is use of an original and simple technique, especially with low cost in relation to the earlier works described elsewhere. Obtaining solutions of both polymers and studies of miscible mixtures is the basis of the blending preparation process. The mass percentage ratios used to prepare the blends were 5, 10 and 20% ECO in PHB. Fourier transform infrared spectroscopy, scanning electron microscopy (SEM) and dynamic-mechanical thermal analysis (DMA) were used for characterization of blends. It was observed an increase in the flexibility of blends when compared to PHB as pointed out in the recent literature. By using SEM, it was concluded that there is interaction between the phases present in the blend and this interaction benefits miscibility. The results obtained by the DMA analyses in flexion modulus and by the differential scanning calorimetry (DSC) curves showed miscibility is dependent on ECO concentration as expected. Keywords Blend · Polyhydroxybutyrate · Copolyester · DMA · ECOFLEX · PHB
* Vagner Roberto Botaro [email protected] Extended author information available on the last page of the article
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Polymer Bulletin
Introduction The use of polymers in society has increased more and more due to the wide variety of these materials on the current market linked to ease large-scale production that these materials present. The production of polymers has increased over the years driven mainly by the automotive, packaging, food and civil construction industries [1]. Currently, there is a demand for new engineering materials presenting a combination of strength, low density, processing easiness and reduced costs [2]. With the increase in the production and consumption of plastic materials in society, there is also a growing concern and awareness related to pollution and environmental problems that the disposal of these materials generates [3, 4]. Thus, is very important searching for materials that are from renewable sources and preferably biodegradable, for example. PHB is an alternative because of its biodegradability [5–10], but it is usually expensive and brittle, but these aspects can be improved through the formation of blends, such as with polyprop
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