Authors:
Josiane de Lima Souza Instituto de Química de Araraquara, Universidade Estadual Paulista, UNESP Departamento de Química Analítica C. P. 355 Araraquara SP Brazil

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Marcelo Kobelnik Instituto de Química de Araraquara, Universidade Estadual Paulista, UNESP Departamento de Química Analítica C. P. 355 Araraquara SP Brazil

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Clóvis Ribeiro Instituto de Química de Araraquara, Universidade Estadual Paulista, UNESP Departamento de Química Analítica C. P. 355 Araraquara SP Brazil

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Jorge Capela Instituto de Química de Araraquara, Universidade Estadual Paulista, UNESP Departamento de Química Analítica C. P. 355 Araraquara SP Brazil

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Marisa Crespi Instituto de Química de Araraquara, Universidade Estadual Paulista, UNESP Departamento de Química Analítica C. P. 355 Araraquara SP Brazil

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Abstract  

Poly(3-hydroxybutyrate), PHB, has been structurally modified through reaction with hydroxy acids (HA) such as tartaric acid (TA) and malic acid (MA). The crystallization kinetic of the samples was evaluated by isoconversional method through nonlinear fitting to obtain the estimation for activation energy (Ea) and pre-exponential (A) values. The thermal behavior of the crystallization temperature, 44.8 and 58.9 °C at 5 °C/min, and results obtained to the average activation energy, 73 ± 9 kJ mol−1 and 63 ± 1 kJ mol−1, to PHB/MA and PHB, respectively, are suggesting that malic acid may be deriving plasticizer units from its own PHB chain. PHB/TA show increase in the medium value of Ea, 119 ± 2 kJ mol−1 and Tc = 48.2 °C (at 5 °C/min), indicating that tartaric acid is probably interacts in different way to the of PHB chain (Ea=73 ± 9 kJ mol−1, Tc = 44.8 °C at 5 °C/min).

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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