Waterborne Poly(urethane-urea)s Nanocomposites Reinforced with Clay, Reduced Graphene Oxide and Respective Hybrids: Synthesis, Stability and Structural Characterization

Journal of Polymers and the Environment - Tập 28 - Trang 74-90 - 2019
Italo Rennan Sousa Vieira1, Larissa de Fátima de Oliveira Costa1, Gisele dos Santos Miranda2, Stefania Nardecchia3, Mariana Sato de Souza de Bustamante Monteiro4, Eduardo Ricci-Júnior4, Marcia Cerqueira Delpech1
1Instituto de Química, Universidade do Estado do Rio de Janeiro (IQ/UERJ), Rio de Janeiro, Brazil
2Colégio Universitário Geraldo Reis da Universidade Federal Fluminense (COLUNI/UFF), Niterói, Brazil
3Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro (PUC-RIO), Rio de Janeiro, Brazil
4Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro (FF/UFRJ), Rio de Janeiro, Brazil

Tóm tắt

Nanocomposites based on waterborne poly(urethane-urea)s (NWPUU) containing hydrophilic montmorillonite (MMT) clay, reduced graphene oxide (rGO) or MMT/rGO hybrids were produced by a green synthesis method. Polymer matrices were based on poly(ethylene glycol-block-propylene glycol) (PEG-b-PPG) (with different contents of PEG-based segments), poly(propylene glycol) (PPG), isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA) and hydrazine. Aqueous dispersions were characterized in terms of particle hydrodynamic diameter (DH) and rheological parameters and respective cast films were investigated by X-ray diffraction (XRD), low-field nuclear magnetic resonance (NMR) relaxometry and Fourier-transform infrared spectrometry (FTIR). Pseudoplastic dispersions with DH < 200 nm were stable for more than 12 months. The formation of exfoliated structures suggested the homogeneous nanodispersion of MMT silicate layers and rGO nanosheets. MMT/rGO synergism and layer-to-layer interactions suggested segregation of phases. Hydrogen bonds between polar groups of nanoloads and rigid segments of WPUU influenced the structure and molecular dynamics of the chains.

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