Role of Graphene Oxide on the Mechanical Behaviour of Polycarbonate-Urethane/Graphene Oxide Composites

Author(s)

Maestrelli, L. M. D. ^[1] ; Oyama, H. T. T. ^[2] ; Munoz, P. A. R. ^[1] ; Cestari, I. A. ^[2] ; Fechine, G. J. M. ^[1]

Affiliation

^[1] Univ Presbiteriana Mackenzie, Mackenzie Inst Pesquisa Grafeno & Nanotecnol, Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Fac Med, Hosp Clin HCFMUSP, Inst Coracao, Lab Bioengn, Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 24, n. 3 2021.
• Web of Science Citations: 0

Abstract

A new generation of carbon-based materials such as graphene and graphene oxide (GO) have been widely studied due to their potential in a variety of applications including biomedical materials and devices. This work investigates the appropriate GO morphology and content to be used as a filler for a poly(carbonate urethane) (PCU) polymer in order to mechanical properties improvements. Two graphene oxides with different levels of oxidation and morphology were blended into a PCU matrix to obtain high mechanical performance and good flexibility. Nanocomposites of PCU and GO were produced with a filler content of 0.2 wt%, 0.4 wt%, and 2.0 wt%. Polymeric membranes were obtained using solvent evaporation and characterised by their thermal properties (Differential Scanning Calorimetry), thermo-mechanical (Dynamic-Mechanical Thermal Analysis), and mechanical test results (tensile). The results indicated that GO platelets tend to interact strongly with the hard segments (HS) of PCU chains due to the polar chemical similarity of GO and HS structures. Two mechanical behaviours were found for the PCU/GO-2 nanocomposites, at small and large deformations. Improvements in the Secant Modulus and values of stress until 350% of strain are observed for low filler content while high filler content is needed for improvements at break point (stress and strain). PCU/GO nanocomposites with high mechanical performance can be produced by adjusting the GO content and characteristics to reach different application possibilities. (AU)

• FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
• Grantee: Antonio Helio de Castro Neto
• Support Opportunities: Research Projects - SPEC Program
• FAPESP's process: 12/50283-6 - Circulatory support in pediatric patients: ventricular assist device and extracorporeal membrane oxygenation
• Grantee: Idágene Aparecida Cestari
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/10910-8 - Photodegradation and photostabilization of polymer nanocomposites based on two-dimensional fillers
• Grantee: Guilhermino José Macêdo Fechine
• Support Opportunities: Regular Research Grants