Poly(vinyl alcohol)(PVA)is usually processed and used in a form of aqueous dispersion.A large number of inter-and intramolecular hydrogen bonds make it very difficult to obtain suitable rheological behavior for processing.In this study,carbon particles with different topological shapes were added into PVA aqueous dispersion to tune the steady and dynamic rheological behavior.The results show that the zero-dimensional particles(carbon black,CB)increase monotonically the zero-shear viscosity of PVA dispersion,while the one-dimensional particles(carbon nanotubes,CNTs)make it first increase,and then decrease and rise again,like an N-shape,and the two-dimensional particles(graphene oxide,GO)can make it first decrease and then increase,exhibiting a U-shape.It is believed that the topological shape of the carbon particles brought about these discrepancies.The zero-dimensional particles mainly act as physical crosslinking points due to their small size.While at a certain content,both CNTs and GO can destroy the intermolecular hydrogen bonds between PVA chains because the PVA chains can twine around the slim CNTs and the large planar size of GO prevents the adsorbed PVA from forming hydrogen bond with other chains.The high hydroxyl value of carbon particle surface could strengthen this effect.It is expected that the viscosity of polymer dispersion can be regulated by particles with different topological shape and the surface characteristic,so as to widen the operable concentration range during preparing composite functional materials.

Qing-Sheng Ni;Miao Du;Guo-Rong Shan;Yi-Hu Song;Qiang Zheng

State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,China

高分子科学（英文版）

[1]Qing-Sheng Ni;Miao Du;Guo-Rong Shan;Yi-Hu Song;Qiang Zheng-.Effect of Carbon Particles with Different Topological Shape on the Rheological Behavior of PVA Aqueous Dispersion)[J].高分子科学（英文版）,2022(11):1402-1410

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