Authors
CMUA, Department of Electrical and Electronics Engineering, Universidad de los Andes, Cra. 1E No. 19a – 40, Bogota, DC 111711, Colombia.
Abstract
Absorption and desorption properties of poly(ethylene glycol) diacrylate (PEGDA) have seen to greatly vary depending on the molecular weight of the polymer, suggesting a dependence of the wetting phenomena on its molecular weight. Here, two sets of polymeric submicron films (140 and 190 nm) were fabricated by free radical polymerization using Phenylbis (2, 4,
6-trimethylbenzoyl) phosphine oxide as the photoinitiator, and PEGDA (Mn 250 or 575). The films were spin coated on glass substrates to study their wetting phenomena by dynamic contact angle analysis. All films were characterized in terms of their thickness and transmittance. PEGDA Mn 250 films (Film-250) decreased the sliding time of water drops when compared to a clean glass substrate because of a decrement in the liquid-solid interface area. Nonetheless, when using PEGDA Mn
575 films (Film-575), an improvement in the adhesion forces between the coating and the drop of water was observed, avoiding the drop to slide down the substrate and leading to its later evaporation. In addition, Film-575 drastically
changed their morphology after water exposure, while Film-250 remained the same. These characteristics are of special interest in environments where a response towards small amounts of water is desired, or where water evaporation is craved. Copyright © 2018 VBRI Press.
Keywords
durable hydrophobic surfaces through surface texturing. Appl Surf
Sci 257:5688–5693.
DOI:10.1016/j.apsusc.2011.01.074
2.Gao S-H, Gao L-H, Zhou K-S (2011) Super-hydrophobicity and
oleophobicity of silicone rubber modified by CF 4 radio frequency
plasma. Appl Surf Sci 257:4945–4950.
3.Kumar D, Wu X, Fu Q, Ho JWC, Kanhere PD, Li L, Chen Z
(2015) Hydrophobic sol–gel coatings based on
polydimethylsiloxane for self-cleaning applications. Mater Des
86:855–862.
4.Holubová B, Cílová ZZ, Kučerová I, Zlámal M (2015)
Weatherability of hybrid organic–inorganic silica protective
coatings on glass. Prog Org Coatings 88:172–180.
5.Múgica-Vidal R, Alba-Elías F, Sainz-García E, Ordieres-Meré J
(2014) Atmospheric plasma-polymerization of hydrophobic and
wear-resistant coatings on glass substrates. Surf Coatings Technol
259:374–385.
6.Lopez-Barbosa N, Zuluaga N, Jumah S, Osma JF (2015)
Fabrication of folding polymeric thin films with hydrophilic
properties. Novos Saberes 2:71–83.
7.Bertola V, Wang M (2015) Dynamic contact angle of dilute
polymer solution drops impacting on a hydrophobic surface.
Colloids Surfaces A Physicochem Eng Asp 481:600–608.
8.Bonn D, Eggers J, Indekeu J, Meunier J, Rolley E (2009) Wetting
and spreading. Rev Mod Phys 81:739.
9.Ross AE, Tang MY, Gemeinhart RA (2012) Effects of Molecular
Weight and Loading on Matrix Metalloproteinase-2 Mediated
Release from Poly(Ethylene Glycol) Diacrylate Hydrogels. AAPS
J 14:482–490.
DOI:10.1208/s12248-012-9356-3
10.Yañez‐Soto B, Liliensiek SJ, Murphy CJ, Nealey PF (2013)
Biochemically and topographically engineered poly (ethylene
glycol) diacrylate hydrogels with biomimetic characteristics as
substrates for human corneal epithelial cells.J Biomed Mater Res
Part A 101:1184–1194
)