Perfluoropolyether-based oleophobic additives: Influence of molecular weight distribution on wettability of polyethylene terephthalate films

A New Sustainable PPT Coating Based on Recycled PET to Improve the Durability of Hydraulic Concrete

“…These results are similar to those reported for coatings elaborated with resins synthesized from glycolized PET products on glass and metal substrates [9,11]. The average WCA of PPT coating was 72.90° + 1.51, this measurement indicates a hydrophilic behavior, similar to that reported for PET sheets (78°) [55], PET films (60°), PET/fluorinated oligomeric polyester composite coatings (70-88°) [56], and PET coatings (68-78°) [57]. A tendency to decrease the permeability of the samples as the number of coating layers increases is observed; BC3 indicates that it has a greater ability to reduce the movement of chloride ions through concrete, but BC2 also has a similar behavior to BC3, because its permeability is at the lower to moderate limit and very close to the upper limit of low permeability.…”

Toward the Replacement of Long-Chain Perfluoroalkyl Compounds: Perfluoropolyether-Based Low Surface Energy Grafted Nanocoatings

“…Low surface energy coatings, decreasing/preventing the spreading of oil and water, have drawn considerable interest for numerous practical applications, including self-cleaning surfaces, antifouling and anticorrosion coatings, oil/water separation, and textiles. − The preparation of surfaces with low oil wettability is more challenging than the fabrication of hydrophobic ones because the surface tension (ST) of water (72 mN/m) is much higher than ST of oils (25–40 mN/m), resulting in the virtually complete spreading of oils on practically any nonfluorinated substrate. Only when the surface energy of substrates or coatings is lower than that of oils the substrates/coatings exhibit various degrees of oil repellency. ,− …”

“…Thus, for the fabrication of oil-repellent surfaces, fluorocarbon groups (−CF 2 and −CF 3 ) are used since they reduce the surface tension of the materials more than hydrocarbons do (CF 3 < CF 2 H < CF 2 < CH 3 < CH 2 ). − For decades, long-chain perfluoroalkyl compounds (C n F 2n+1 –, n ≥ 7, LCPFAs) have been used to obtain water- and oil-repellent surfaces in a number of applications, including membranes and polymer films, as well as surfactants. ,,− However, LCPFAs (frequently mentioned as ″forever chemicals″ in popular media), owing to their bioaccumulative and toxicological effect on the environment, humans, and wildlife, have been phased out of production and applications. − Currently, low surface energy perfluoropolyethers (PFPEs) are being considered as the replacement for long-chain perfluoroalkyl substances because of the presence of oxygen between the fluorinated units in their backbone. ,,,− Perfluoropolyethers are projected to be safer than LCPFAs because of the materials’ low toxicity and high oxidative/thermal stability. ,− PFPEs are biocompatible and present on the FDA list for food contact products . In addition, during the thermal degradation, PFPEs release in the environment significantly fewer compounds in comparison with other fluoropolymers …”

Additive Effect of Graphene and Lignin‐Derived Graphene on Radical Polymerization Behaviors of Methacrylate Monomers

“…The structure and molecular weight of polymers strongly influence various properties of polymers. [1][2][3][4][5] Chain polymerizations with the fast polymerization rate have often been applied to the development of polymer materials. Among various chain polymerization techniques, living polymerization is an excellent method for producing polymers with a well-defined structure and a narrow molecular weight distribution (MWD).…”

“…We have focused on graphene, consisting of a single layer of sp 2 -bonded carbon atoms, interacts with vinyl monomers, and is considered as a novel additive candidate for producing polymers with a wide MWD. Graphene is one of the most useful carbon materials to be applied to next-generation materials, [13][14][15] and its composite materials with polymers tend to exhibit greater properties compared to the precursor polymers, owing to the excellent characteristics of graphene.…”