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Evaluation of the production of PHBV/cellulose nanowhiskers nanocomposites in a thermokinetic mixer

Grant number: 19/15888-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): October 01, 2019
Effective date (End): September 30, 2020
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Ana Paula Lemes
Grantee:Vitor Siqueira de Faria
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Federal de São Paulo (UNIFESP). Campus São José dos Campos. São José dos Campos , SP, Brazil

Abstract

Nowadays, the biodegradable polymers are a recurrent object of study, because of the concern about the environment. Among those, the poly(3-hydroxybutyrate-co-3-hydroxyvalerate), or PHBV, stands out, belonging to the PHA family. The PHBV holds a great potential of application in packaging industry and in the medical field, in the production of scaffolds for tissue regeneration. However, the PHBV still has some limitations for these applications, such as low shear strength and a high cost. Thus, it's important and interesting the production of PHBV nanocomposites since the addition of a nanofiller may cause an increase of the polymer shear strength and/or entail changes in properties that increases the potential of application in a determined area. The cellulose nanocrystals (CNC) can be used as a reinforcement for the PHBV matrix, since it has desirable mechanical properties and meets the requirement of being, such as the PHBV, obtained from a renewable resource, as well being biocompatible and biodegradable. Nevertheless, because of a hydrophilic nature of the CNC, it is desirable the use of a compatibilizer agent to obtain a good adhesion between nanofiller/matrix. That way, nanocomposites of PHBV-g-MA and PHBV reinforced with CNC will be produced with 1, 3 and 5% weight concentrations of the CNC in a thermokinetic mixer. The composite specimen will be made by hot pressing and characterized by scanning electron microscopy (SEM), microtomography test, mechanical tensile strength test, differential scanning calorimeter (DSC) and in-vitro cell proliferation.