Rigid Adherent-Resistant Elastomers (RARE): Nano-, Meso-, and Microscale Tuning of Hybrid Fluorous Polyoxetane鈥揚olyurethane Blend Coatings

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• 作者：Souvik Chakrabarty ; Chenyu Wang ; Wei Zhang ; Kenneth J. Wynne
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：April 23, 2013
• 年：2013
• 卷：46
• 期：8
• 页码：2984-2996
• 全文大小：545K
• 年卷期：v.46,no.8(April 23, 2013)
• ISSN：1520-5835

文摘

A series of hybrid elastomers were prepared by a combination of (1) condensation cured, 鈭扴i(OC₂H₅)₃ end-capped, poly(3-trifluoroethoxymethyl-3-methyloxetane), 鈥?F鈥? and a siliceous domain 鈥渂uilder鈥? bis(triethoxysilyl)ethane, and (2) a linear 3F polyurethane 鈥淯-3F鈥? Hybrid compositions U-3F-x are designated by polyurethane weight percent 鈥?i>x鈥? Bulk characterization includes thermal transitions (DMA, DSC), mechanical properties (DMA, tensile), and susceptibility to swelling by a hydrocarbons (hexadecane). Increased mechanical properties, particularly toughness, was found with increasing U-3F wt %. Near surface U-3F depletion was established by ATR-IR spectroscopy with Ge and diamond crystals. To describe the length scale for near surface U-3F depletion, the term mesosurface is introduced, which in this context is a depth of 1000 nm. Peak removal force in shear (P_c-s) for a rigid adherent, namely epoxied aluminum cylinders (ECs), was determined with a TA Instruments RSA III. A striking compositional dependence was found for EC adhesion. A U-3F-50 hybrid coating had the lowest adhesion (P_c-s = 0.078 MPa) with good toughness (6.2 MPa). Bulk and surface characterization together with adhesion measurements established U-3F-x hybrid coatings, and U-3F-50 in particular, as new fluorous rigid adherent-resistant elastomers (RARE) that are tough, oil resistant, and optically transparent.