Improvement of the thermal properties of poly(3-hydroxybutyrate) (PHB) by low molecular weight polypropylene glycol (LMWPPG) addition

Authors

  • Juan P. B. Roa,

    Corresponding author
    1. Departamento de Química, Universidade Federal de Minas Gerais, UFMG, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, Brazil. 31270-901
    2. Instituto de Ciência e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, UFVJM, Campus JK, Rod. MGT 367, km 583, 5000, Alto da Jacuba, Diamantina, MG, Brazil. 39100-000
    • Departamento de Química, ICEx, Universidade Federal de Minas Gerais, UFMG, Belo Horizonte—MG, Brazil 31270-901
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  • Patrícia S. de O. Patrício,

    1. Departamento de Química, Centro Federal de Educação Tecnológica de Minas Gerais—CEFET-MG, Av. Amazonas, 5253, Belo Horizonte, MG, Brazil. 30421-169
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  • Rodrigo L. Oréfice,

    1. Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal de Minas Gerais, UFMG, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, Brazil. 31270-901
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  • Rochel M. Lago

    1. Departamento de Química, Universidade Federal de Minas Gerais, UFMG, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, Brazil. 31270-901
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Abstract

In this work, blends of poly(3-hydroxybutyrate) (PHB) with 5, 10, 15, and 20 wt % low molecular weight poly(propylene glycol) (LMWPPG) have been prepared and characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) with attenuated total reflectance (ATR) accessory and simultaneous thermal analysis (TG/DTA). FTIR and thermal analyses suggested that the presence of LMWPPG led to a maximum crystallinity for the blend PHB/PPG (90/10) blend. The presence of LMWPPG also caused a significant increase of the PHB processability window, i.e., the difference of the melting and degradation temperature, of PHB from 105 to 134°C, which is extremely important for the industrial uses of PHB. This PHB stabilization effect is discussed in terms of an intermolecular interaction of the PHB carbonyl with LMWPPG methyl groups which probably hinders the classical radon β-scission PHB intramolecular decomposition mechanism. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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