Preparation and Characterization of Blends of Polyaniline with Poly(Hydroxybutyrate-Co-Valerate)
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Preparation and Characterization of Blends of Polyaniline with Poly(Hydroxybutyrate-CoValerate) David C. da Silva Jr1, Ana Paula Lemes1, Lilia M. Guerrini1, Fernando H. Cristovan1* 1 Universidade Federal de São Paulo, Instituto de Ciência e Tecnologia, São Paulo, Brazil ABSTRACT In this study the PANI/PHBV blends were prepared and thermal properties, crystallization behavior, microstructure of the blends were investigated. The PANI/PHBV blends were prepared by dissolution of PANI (emeraldine base doped with dodecylbenzenesulphonic acid, DBSA) and PHBV in chloroform and films were obtained by casting. PANI amount in the blend was varied from 0.1 to 1% wt. PANI/PHBV blends were characterized by FTIR spectroscopy and the thermal behavior were analyzed by differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). FTIR spectra of the pure PHBV and PANI/PHBV blend had similar peaks. However, blends spectra show an enlargement of bands, due interaction of the chain PANI with PHBV matrix. The crystallization behaviors were investigated using DSC, with at a scanning rate of 10oCmin-1. Curve of pure PHBV showed two melting peaks (159.1oC and 172.3oC). With the increase of PANI amount in the PHBV matrix, both of the melting peaks became wider and shifted to lower temperatures. The decrease trend of first and second melting points with increase of PANI amount, suggests a reduction in the crystallinity of the blends. INTRODUCTION Non-biodegradable polymers are extensively used in now a day in the automotive industry, plastic bags and electronic industry. This materials generate pollution problems because remain in the soil for several years. Biodegradable polymers can help overcome reduce petroleum dependency and pollution problems. Among the biodegradable polymers the Polyhydroxyalkanoates (PHA) family is a candidate to solve these problems. A typical example of PHA is poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), which is produced by bacteria from agricultural raw materials and has good biodegradability, thermoplasticity and biocompatibility [1,2]. PHBV is a derivate of poly-hydroxybutyrate (PHB) the is the most study biodegradable polymer, but often been limited by its narrow processing window and brittleness [3,4], whereas, PHBV is more flexible than PHB due to the presence of the hydroxyvalerate units (HV) in its structure [5]. To improve the properties and range of applications in these materials, the blending of polymers is an alternative way of acquiring a new material with desired properties. There are some studies about a blending of PHBV with semicrystalline polymers such as poly(ε-caprolactone) [6], poly(L-lactic acid) [7], poly(butylene adipate-co-terephthalate) [8]. However, there are not any studies about conducting polymers blends with PHBV. Among conducting polymers the polyaniline (PANI) is the most studied because its unique properties. PANI can be used for development many electronic devices such as sensor [9,10], varistors [11], antistatic protection [12]. For many years it was believed
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