Thickness Dependence of Ice Removal Stress for a Polydimethylsiloxane Nanocomposite: Sylgard 184
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- 作者：Chenyu Wang ; Trae Fuller ; Wei Zhang ; Kenneth J. Wynne
- 刊名：Langmuir
- 出版年：2014
- 出版时间：November 4, 2014
- 年：2014
- 卷：30
- 期：43
- 页码：12819-12826
- 全文大小：372K
- ISSN：1520-5827
文摘
Minimizing adhesion of ice has been the subject of extensive studies because of importance to applications such aircraft wings, spacecraft, and power transmission wires. A growing interest concerns coatings for wind turbine blades and refrigeration. Herein, a new laboratory test was employed to obtain the thickness dependence of ice adhesion for Sylgard 184鈥攁 filled polydimethylsiloxane elastomer. A correlation between ice adhesion and coating thickness (t) was found that follows a relationship developed by Kendall over 40 years ago for removal of a rigid object from an elastomer. With a 0.05 mm/s probe speed a nearly linear relationship between peak removal stress (Ps) and 1/t1/2 was obtained with Ps 鈭?460 kPa for an 18 渭m coating, decreasing to 鈭?20 kPa for 533 渭m. Preliminary results suggest that below 鈭?0 渭m Ps departs from the 1/t1/2 correlation while above 鈭?00 渭m a limiting value for Ps may be reached. We previously reported that probe speed has negligible effect on the glassy polymer PMMA. In contrast, probe speed is identified as an important variable for testing ice release on elastomeric Sylgard 184 coatings. While work of adhesion, which is related to surface free energy, is recognized as an important factor that can affect ice release, the results reported herein show that coating thickness can override this single parameter for elastomeric substrates.