A Review on Thickness Dependence of Surface Free Energy in Ultrathin Polymer Films

Document Type : compile

Authors

1 Department of Polymer Engineering, Petroleum and Chemical Engineering Faculty, Science and Research Branch, Islamic Azad University,Tehran, I.R. Iran

2 2 Department of Polymer Engineering, Petroleum and Chemical Engineering Faculty, Science and Research Branch, Islamic Azad University, Tehran, I.R. Iran

Abstract

In recent years, thin and ultrathin polymer films coated on solid surfaces have been widely used in various industries such as coatings, adhesives, membranes, sensors, etc. However, as the film becomes thinner, the effect of the interfaces increases, so that in thicknesses below 100 nm, the structure and properties of such ultrathin films, including surface properties such as surface free energy, undergo significant changes relative to the bulk of the same polymer. Considering the importance of surface free energy as a controlling factor in many industrial and theoretical phenomena such as adsorption, wettability, lubrication, etc. in polymers, this article aims to review the changes in surface free energy of ultrathin polymer films with changing their thicknesses. Two main factors have been identified in the literatures for surface free energy changes with changing films thicknesses in ultrathin polymer films. First, the long-range forces acting on the chains from the substrate as well as on the droplet placed on the film surface in order to measure the contact angle, and second, the finite size effect that in thicknesses comparable to the gyration radius of polymer chains, along with the intra- and intermolecular entanglements, can strongly affect the conformation of polymer segments as well as the chain mobility in ultrathin films which are slightly screening out with increasing the film thickness.

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References

1.  Iqbal Z., Moses W., Kim S., Kim E.J., Fissell W.H., and Roy S., Sterilization Effects  on Ultrathin Film Polymer  Coatings 
for  Silicon-Based Implantable  Medical  Devices.,  J. Biomed. Mater. Res. Part B: Appl. Biomater, 106, 2327-2336, 2017. 
2.  Ju Y.H., Lee H.J., Han C.J., Lee C.R., Kim Y., and Kim J.W., Pressure-Sensitive Adhesive with Controllable Adhesion 
for Fabrication of Ultrathin Soft Devices, ACS Appl. Mater. Interfaces,  12, 40794-40801, 2020.
3.  Jiang C., Zhang L., Li P., Sun H., Hou Y., and Niu Q.J., Ultrathin-Film Composite Membranes Fabricated by Novel 
In Situ Free Interfacial Polymerization for Desalination, ACS Appl. Mater. Interfaces,  12, 25304-25315, 2020.
4.  Liang J., Song Z., Wang S., Zhao X., Tong Y., Ren H. et al., Cobweb-like, Ultrathin Porous Polymer Films for Ultrasensitive NO2 Detection, ACS Appl. Mater. Interfaces, 12, 52992-53002, 2020.
5.  Park M., Harrison C., Chaikin P.M., Register R.A., and Adamson D.H., Block Copolymer Lithography: Periodic Arrays of Holes n 1 Square Centimeter, J. Sci., 276, 1401-1404, 1997.
6.  Liu Y. and Sakurai K., Slow Dynamics in Thermal Expansion of Polyvinyl Acetate Thin Film with Interface Layer, Polym. 
J., 51, 1073-1079, 2019.
7.  Dee G.T. and Sauer B.B., The Surface Tension of Polymer Liquids,  Adv. Phys.,  47, 161-205, 1998.
8.  Hamaker H.C., The London-van der Waals Attraction between Spherical Particles, Physica, 4, 1058-1072, 1937.
9.  Israelachvili J.N., Intermolecular and surface forces, Academic, California, 3, 415-417, 2011.
10. Ashley K.M., Raghavan D., Douglas J.F., and Karim A., Wetting-Dewetting Transition Line in Thin Polymer Films, 
Longmuir,  21, 9518-9523, 2005.
11. Sperling L.H., Introduction to Physical Polymer Science, John Wiley and Sons, New Jersey, 615-620, 2006.
12. de Gennes P.G., Wyart F.B., and Quere D., Capillarity and Wetting Phenomena, Springer, New York, 1-6, 2004. 
13. Sell P.J. and Neumann A.W., The Surface Tension of Solids, Angew. Chem. Int., 5, 299-307, 1996.
14. Wenzel R.N., Resistance of Solid Surfaces to Wetting by Water,  J. Ind. Eng. Chem.,  28, 988-994, 1936.
15. Starov V.M. and Velarde M.G., Surface Forces and Wetting Phenomena,  J. Phys.: Condens. Matter,  21, 464121, 2009.
16. Fox R.B., Price T.R., and Cain D.S., Wettability and Constitution of Photooxidized Polystyrene and other 
Amorphous Polymers,  J. Adv. Chem.,  78, 72-84, 1968.
17. Shimizu R.N. and Demarquette R.N., Evaluation of Surface Energy of Solid Polymers Using Different Models,  J. Appl. 
Polym. Sci.,  76, 1831-1845, 2000.
18. Shimizu R.N. and Demarquette R.N., Evaluation of Surface Energy of Solid Polymers Using Different Models,  J. Appl. 
Polym. Sci.,  76, 1831-1845, 2000. 
19. Ebnesajjad S.,  Surface Treatment of Materials for Adhesion Bonding, William Andrew, USA, 9-11, 2006.
20. Tadmor R., The London–van der Waals Interaction Energy between Objects of Various Geometries,  J. Phys.: Condens. 
Matter,  13, 191-202, 2001.
21. Extrand C.W., Continuity of Very Thin Polymer Films, Langmuir, 9, 475-480, 1993. 
22. Stojimirovic B., Vis M., Tuinier R., Philipse A.P., and Trefalt G., Experimental Evidence for Algebraic Double-Layer 
Forces,  Langmuir,  36, 47-54, 2020.
23. Xiang L., Zhang J., Gong L., and Zeng H., Surface Forces and Interaction Mechanisms of Soft Thin Films under Confinement: A Short Review, Soft Matter, 16, 6697-6719, 2020. 
24. Wu J. and Mate C.M., Contact Angle Measurements of Lubricated Silicon Wafers and Hydrogenated Carbon Overcoats, Langmuir,  14, 4929-4934, 1998. 
25. Abbasian A., Ghaffarian S.R., Mohammadi N., and Fallahi D., The Contact Angle of Thin-Uncured Epoxy Films: Thickness Effect, Colloid. Surfaces A: Physicochem. Eng. Asp., 236, 133-140, 2004. 
26. Hato M., Attractive Forces between Surfaces of Controlled “Hydrophobicity” across Water: A Possible Range of 
“Hydrophobic Interactions” between Macroscopic Hydrophobic Surfaces Across Water, Phys. Chem., 100, 18530-18538, 1996.
27. Tsao Y.H., Yang S.X., and Evans D.F., Interactions between Hydrophobic Surfaces Dependence on Temperature and Alkyl Chain Length, Langmuir, 7, 3154-3159, 1991. 
28. Woodward J.T., Gwin H., and Schwartz D.K., Contact Angles on Surfaces with Mesoscopic Chemical Heterogeneity, 
Langmuir,  16, 2957-2961, 2000. 
29. Faghihnejad A. and Zeng H., Hydrophobic Interactions between Polymer Surfaces: Using Polystyrene as a Model System, Soft. Matter., 8, 2746-2759, 2012.
30. Li Y., Pham J.Q., Johnston K.P., and Green P.F., Contact Angle of Water on Polystyrene Thin Films: Effects of CO2 
Environment and Film Thickness, Langmuir, 23, 9785-9793, 2007. 
Basparesh
Volume 13, Issue 2 - Serial Number 47
September 2023
Pages 71-78

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