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Sharkskin mechanism of high‐impact polystyrene (HIPS) and rheological behavior of HIPS/TiO 2 composites
Author(s) -
Wang Xin,
Wang Zhaobo,
Wu Qiye
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.21517
Subject(s) - materials science , composite material , rheology , polystyrene , rheometry , rheometer , slip (aerodynamics) , polymer , thermodynamics , physics
The rheological behaviors of high‐impact polystyrene (HIPS) and HIPS/TiO 2 composites were investigated by use of a rheometer in the present article. HIPS exhibited a constant critical stress of the sharkskin in various temperatures, and the analysis indicated that the mechanism of sharkskin of HIPS was wall–slip and its special temperature dependency was determined by weak wall–melt adsorption. The experimental results also showed that the introduction of TiO 2 into HIPS only slightly influenced the apparent viscosity (η a ) of the composites. Moreover, TiO 2 exhibited an unusual effect on the non‐Newtonian index of the composites at high shear rate. Both phenomena indicated the increase of inner free volume induced by TiO 2 in molecularly rigid HIPS. Moreover, it was noteworthy that a featured stress could be used to label the dispersion of TiO 2 in the HIPS matrix, and the numeric affinity of this featured stress and the critical stress of sharkskin revealed that both processes were relevant to the same molecular relaxation. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 802–807, 2005