Citation: Li-na Wang, Huan-huan Zhang, Lin Xu, Bin-yuan Liu, Tong-fei Shi, Shi-chun Jiang, Li-jia An. Viscosity of Blend Films of Linear and Ring Polystyrenes[J]. Acta Polymerica Sinica, ;2018, (6): 741-747. doi: 10.11777/j.issn1000-3304.2017.17315 shu

Viscosity of Blend Films of Linear and Ring Polystyrenes

  • Dewetting behaviors on PDMS substrate of linear polystyrene (LPS) film, ring polystyrene (RPS) film and the blended films with different mixing ratios are investigated. The radii of the holes exhibit exponential growth with time for the above mentioned types of films. The dewetting velocity of RPS film appears slower than that of LPS film, and the velocity of the blended films falls in between the above two. Moreover, the velocity of the blended films decreases with increasing RPS fraction. The surface energies of the films are calculated from the contact angles of two different liquids (water and ethylene glycol) on top of the corresponding films. Results show that the surface energies of the blended films are smaller than those of LPS film and RPS film. The surface energy reaches the lowest value for the blended film with 70% of RPS, which may be caused by the different roughness measurements for LPS film, RPS film and the blended films. The viscosities of these films are obtained through the radii of the dewetting holes, the dewetting velocities, the widths of the rims and the receding contact angles along dewetting process. Results show LPS film has a lower viscosity than RPS film. The viscosities of the blended films fall in between those of LPS film and RPS film, and increase with increasing RPS concentration. Moreover, the experimental viscosities of the blended films present lower values than those calculated from the pure-component viscosity using a binary mixing rule. The ratio of the experimental viscosity to the calculated viscosity reaches a lowest value with 70% of RPS. This may be attributed to the efficient packing ability of the ring chains, the effect of chain threading and the amount of free volume in the film.
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