Towards Novel Fluorinated Methacrylic Coatings for Cultural Heritage: A Combined Polymers and Surfaces Chemistry Study

Abstract

In this work, new co- and ter-polymers of methyl methacrylate (MMA), ethyl methacrylate (EMA), and N-butyl methacrylate (nBuMA), containing just 1% mol × mol−1 of a fluorinated co-monomer, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-octyl methacrylate (POMA), were synthesized. After an UV accelerated aging test, the photo-chemical stability of the polymers prepared was determined by 1H NMR and FT-IR spectroscopy, size exclusion chromatography, differential scanning calorimetry and wettability measurements. The polymers were applied to Botticino tiles to achieve better performances in terms of water repellency and consequently deterioration resistance. One-year prolonged exposure to a real environment was conducted and the properties of the coated materials and their performances were studied using different surface techniques such as water contact angle (WCA) and colorimetric measurements (CIELaB), capillary absorption, permeability (RVP) tests and soluble salts determination. The effectiveness of the fluorinated methacrylic coatings was clearly demonstrated; among all the resins, the co-polymer MMA_POMA seems to be the most performing one. Furthermore, both the UV photo-chemical resistance and the easiness of removal was successfully studied.

The synthesis of monodispersed M-CeO2/SiO2nanoparticles and formation of UV absorption coatings with them

“…Fluorinated acrylics, which generally contain peruoroalkyl segments, are typical low surface energy materials with outstanding water/oil repellence characteristics, antifouling properties and satisfactory adhesion on different substrates. [1][2][3][4][5] These unique properties make them ideal candidates for outdoor coatings, which has attracted widespread attention from researchers. [6][7][8] The purpose of outdoor coatings is to protect the substrates from harsh environments, such as sunlight, rain, and air pollution.…”

Accelerated Ageing Procedures to Assess the Stability of an Unconventional Acrylic-Wax Polymeric Emulsion for Contemporary Art

“…Following the formation of the film, the peaks related to the absorption of the hydroxyl groups are no longer present. Besides, several absorptions from the Edelwachs binding media are more intensely visible [ 44 , 45 , 46 ]: The narrow and sharp peaks at 2954 cm −1 and 2869 cm −1 are associated with the asymmetric and symmetrical stretching of the methyl -CH 3 group, respectively, due both to the acrylic dispersion and the wax emulsion; Similarly, the narrow and sharp absorptions at 2917 and 2849 cm −1 related to the asymmetric and symmetric stretching of the methylene group are linked to acrylic copolymers and wax; The C=O stretching band at 1726 cm −1 and C-O-C stretching band at 1144 cm −1 of the ester absorptions are linked to the presence of the acrylic emulsion; they may also indicate the co-presence of a natural wax in the formulation; The peaks at 1450 cm −1 and 1461 cm −1 can be associated with -CH 2 bending vibration, together with 1385 cm −1 , which refers to out-plane CH bending; The absorptions at 1240 and 1167 cm −1 refer to the stretching of the group C-O and C-C; Two sharp rocking vibrations at 734 and 723 cm −1 of methylene groups characteristic of a compound with a long aliphatic chain, such as a wax; …”

Design of New Polyacrylate Microcapsules to Modify the Water-Soluble Active Substances Release

“…Moreover, the use of biopolymers is useful for applications involving the biodegradable nature of the protective shells, for example in the case of zootechnic probiotics [ 34 ]. However, the use of synthetic polymers as encapsulating materials is of particular interest in the field of porous and permeable microcapsules preparation [ 35 ] and, in this latter case, polyacrylates are the main protagonists [ 36 ], due to their easy and cheap preparation using both solvent and water-based dispersing media [ 37 , 38 , 39 ], the possibility to use ad hoc functionalized monomers to obtain smart shells [ 40 ] and, last but not least, the biocompatible and biodegradable nature of some acrylic monomers, such as acrylamide [ 41 ]. Thus, the fine modulation of pores dimension and distribution are the key properties of such enveloping materials [ 42 ].…”