Wei-juan Ye, Wei-yang Lv, Qing-qing Mei, Hua-kang Fu, Miao Du, Qiang Zheng. Influence of Hydrogen-bond on the Rheological Behavior of Poly(vinyl alcohol). [J]. Acta Polymerica Sinica (10):1216-1222(2015)
DOI:
Wei-juan Ye, Wei-yang Lv, Qing-qing Mei, Hua-kang Fu, Miao Du, Qiang Zheng. Influence of Hydrogen-bond on the Rheological Behavior of Poly(vinyl alcohol). [J]. Acta Polymerica Sinica (10):1216-1222(2015) DOI: 10.11777/j.issn1000-3304.2015.15073.
Influence of Hydrogen-bond on the Rheological Behavior of Poly(vinyl alcohol)
poly(vinyl alcohol) (PVA) aqueous solutions showed distinctive rheological behaviors caused by the hydrogen bonded networks
which include hydrogen bonding between polymer chains and water
intra and inter macromolecular hydrogen bonding.The steady shear curves sof PVA aqueous solutions with the concentration of 10 wt% indicated four regions with increasing shear rate
the first plateau
the first shear thinning region
the second plateau and the second shear thinning region.The experimental results combined with the scaling theory exhibited that the occurrence of the first shear thinning region owed to the inter-macromolecular hydrogen bonding while the arising of the second shear thinning region was due to the disentanglement of PVA chains.The decreasing of viscosity and hydration number of PVA aqueous solutions with introduction of sodium dodecyl sulfate (SDS) also demonstrated the rheological behavior of PVA aqueous solutions in low shear range mainly depended upon the inter-macromolecular hydrogen bonding.In addition
changes in alcoholysis degree and shearing history produced remarkable effect on hydrogen bonded networks
making different rheological responds for PVA aqueous solutions.Since PVA is a semi-crystalline polymer
spinodal decomposition could be observed in PVA aqueous solutions
resulting in the appearance of polymer-rich and polymer-poor phases.The longer aging time benefited the formation of hydrogen bonding and the phase separation of PVA aqueous solutions
causing the increase of viscosity during the shear recovery process upon decreasing shear rate.
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