Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (4): 829.

• Articles • Previous Articles     Next Articles

Frictional Behavior of Poly(2-acrylamido-2-methylpropanesulfonic acid) Hydrogel-gss SystemInfluence of Compressive Modulus

DU Miao*, ZHANG Yan, ZHENG Qiang   

  1. Department of Polymer Science and Engineering, Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027, China
  • Received:2009-06-16 Online:2010-04-10 Published:2010-04-10
  • Contact: DU Miao. E-mail: dumiao@zju.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20674072)资助.

Abstract:

The frictional behavior of poly( 2-acrylamido-2-methylpropanesulfonic acid )( PAMPS ) hydrogel sliding against glass plate in water were studied over a wide sliding velocity region. It reveals that the frictional stress(f) increases with increase sliding velocity(v) at high velocity region, and fv prevails, which is considered as the hydrodynamic lubrication. However, at small v region, fv failed and f decreases slightly as v increase, which does not obey the hydrodynamic lubrication mechanism. The decrease of f with v in small v region does not arise from the stress relaxation of PAMPS hydrogel during the measurement but the shearing thinning of PAMPS hydrogel surface network and the mixed lubrication. PAMPS gel with high compressive modulus(E) exhibits high f than that of hydrogel with small E at slow v region, which is not coincide with the model′s expectation. At the same time, PAMPS hydrogel with small E is observed to be easy to form hydrodynamic lubrication than that with large E. This is believed to be related to the excellent deforming ability of PAMPS hydrogel with small E.

Key words: Poly(2-acrylamido-2-methylpropanesulfonic acid) hydrogel; Frictional behavior; Compressive modulus

TrendMD: