Non-Isothermal Crystallization Kinetics of Injection Grade PHBV and PHBV/Carbon Nanotubes Nanocomposites Using Isoconversional Method

Autor(es)

Montanheiro, Thais Larissa do Amaral ^[1] ; de Menezes, Beatriz Rossi Canuto ^[1] ; Montagna, Larissa Stieven ^[2] ; Beatrice, Cesar Augusto Gonsalves ^[3] ; Marini, Juliano ^[3] ; Lemes, Ana Paula ^[2] ; Thim, Gilmar Patrocinio ^[1]

Afiliação do(s) autor(es)

^[1] Technol Inst Aeronaut ITA, Plasmas & Proc Lab LPP, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Fed Univ Sao Paulo Unifesp, Technol Lab Polymers & Biopolymers TecPBio, BR-12231280 Sao Jose Dos Campos, SP - Brazil

^[3] Fed Univ Sao Carlos UFSCar, Mat Engn Dept DEMa, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF COMPOSITES SCIENCE; v. 4, n. 2 JUN 2020.
• Citações Web of Science: 0

Resumo

Carbon nanotubes (CNT)-reinforced polymeric composites are being studied as promising materials due to their enhanced properties. However, understanding the behavior of polymers during non-isothermal crystallization is important once the degree of crystallinity and crystallization processes are affected when nanoparticles are added to matrices. Usually, crystallization kinetics studies are performed using a model-fitting method, though the isoconversional method allows to obtain the kinetics parameter without assuming a crystallization model. Therefore, in this work, CNTs were oxidized (CNT-Ox) and functionalized with gamma-aminobutyric acid (GABA) (CNT-GB) and incorporated into a poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) matrix. The influence of the addition and functionalization of CNT in the crystallization kinetics of PHBV was evaluated using the isoconversional method with differential scanning calorimetry (DSC), and by polarized light optical microscopy (PLOM) and Shore D hardness. The incorporation and functionalization of CNT into PHBV matrix did not change the Sestak and Berggren crystallization model; however, the lowest activation energy was obtained for the composite produced with CNT-GB, suggesting a better dispersion into the PHBV matrix. PLOM and Shore D hardness confirmed the results obtained in the kinetics study, showing the smallest crystallite size for CNT-containing nanocomposites and the highest hardness value for the composite produced with CNT-GB. (AU)

• Processo FAPESP: 17/02846-5 - Nanocompósito AgVO3/PMMA: Efeito da funcionalização com acrilamida nas propriedades mecânicas e antimicrobianas
• Beneficiário: Beatriz Rossi Canuto de Menezes Rodrigues
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/24873-4 - Nanocompósito de PHBV e NTC funcionalizado com hidroxibutirato: estudo cinético da cristalização e correlação com as propriedades mecânicas
• Beneficiário: Thaís Larissa do Amaral Montanheiro
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/12035-7 - Propriedades mecânicas e antimicrobianas de nanocompósito Ag/PMMA
• Beneficiário: Gilmar Patrocínio Thim
• Linha de fomento: Auxílio à Pesquisa - Regular