Abstract
Here, environmental polyaniline graft epoxy-functionalized poly(vinyl alcohol) (PANI-g-EPVA) nanocomposites of enhanced storage stability and performance were obtained by building chemical bonds between PANI and PVA based on graft polymerization, using water as the medium. The performance of PANI-g-EPVA greatly depended on the epoxy content in PVA chains. With the increasing of the epoxy content, the morphology of colloidal particles changed from inhomogeneous spherical morphology to uniform rice-like morphology; the particle size decreased from 1333 to 153.9 nm; the turbiscan stability index (TSI) increased and the increasing rate of TSI dropped by 0.08 with time, certifying the enhanced storage stability. With incorporating appropriate amount of epoxy groups, PANI was able to distribute uniformly in nanocomposites and films with smooth morphology were obtained. As a result, the tensile strength increased from 24 to 64 MPa, the elongation at break rose from 51 to 166%, and the conductivity increased from 0.4 to 7.3 S/cm. The as-prepared waterborne PANI-g-EPVA nanocomposites can be well dispersed in waterborne epoxy resin to produce anticorrosive coatings. Subsequently, the corrosion current density decreased by two orders and the corrosion potential shifted from −0.67 to −0.54 V, demonstrating improved anticorrosive properties.
Original language | English |
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Pages (from-to) | 585-594 |
Number of pages | 10 |
Journal | Colloid and Polymer Science |
Volume | 296 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Mar 2018 |
Funding
Acknowledgments The authors express sincere thanks to the National Natural Science Foundation of China (No. 51373091), sponsorship by scientific research foundation (SRF) for returned overseas Chinese scholars (ROCS) and State Education Ministry (SEM), Shaanxi Province Science and Technology Research and Development Program of China (No. 2015KJXX-35, 2017GY-154), and support by the Key Laboratory of Education Bureau of Shaanxi Province (No. 2011JS057).
Keywords
- Conductive films
- Graft copolymerization
- Nanocomposites
- Poly(vinyl alcohol)
- Polyaniline
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Polymers and Plastics
- Colloid and Surface Chemistry
- Materials Chemistry