Toward Water and Oil Repellent Coating: Synthesis of Fluorinated Methacrylate-Glycidyl Methacrylate Copolymers.

The development of durable and eco-friendly coatings with excellent adhesion and remarkable surface properties remains a critical pursuit in various industries. This study introduces an innovative methodology for the synthesis of glycidyl methacrylate-co-fluorinated methacrylate (P(GMA-co-FMA)) random copolymers with variable fluorine contents derived from GMA and FMA monomers. The copolymerization of these constituents yields coatings with enhanced durability and unique surface characteristics. Particularly, the incorporation of FMA introduces novel surface functionalities, leading to high water and oil repellent properties. The copolymer-coated surfaces exhibited impressive water contact angles ranging from 105° to 125° and decane contact angles ranging from 50° to 85°. The wettability of the P(GMA-co-FMA) coatings demonstrated a strong dependence on the fluorine content in the copolymers, with higher fluorine content resulting in superior water and oil repellency. Through a comprehensive characterization, we demonstrate the exceptional adhesion and self-cleaning capabilities of the fabricated films. Notably, the self-cleaning efficacy of P(GMA-co-FMA)-coated surfaces persists even following a prolonged duration of 6 months. Furthermore, our investigation reveals the influence of copolymer composition on surface wettability and contact angle hysteresis, providing valuable insights for tailoring coating properties. Overall, the novelty of this study lies in the synthesis of P(GMA-co-FMA) copolymer coatings with superior adhesion and self-cleaning properties. These advancements present promising applications in various fields, including electronics, textiles, and medical supplies, where such durable and functional coatings can significantly enhance product performance and longevity.

Long-term antifouling surfaces for urinary catheters.

The presence of a variety of bacteria is an inevitable/indispensable part of human life. In particular, for patients, the existence and spreading of bacteria lead to prolonged treatment period with many more complications. The widespread use of urinary catheters is one of the main causes for the prevalence of infections. The necessity of long-term use of indwelling catheters is unavoidable in terms of the development of bacteriuria and blockage. As is known, since a permanent solution to this problem has not yet been found, research and development activities continue actively. Herein, polyethylene glycol (PEG)-like thin films were synthesized by a custom designed plasma enhanced chemical vapor deposition (PE-CVD) method and the long-term effect of antifouling properties of PEG-like coated catheters was investigated against Escherichia coli and Proteus mirabilis. The contact angle measurements have revealed the increase of wettability with the increase of plasma exposure time. The antifouling activity of surface-coated catheters was analyzed against the Gram-negative/positive bacteria over a long-term period (up to 30 days). The results revealed that PE-CVD coated PEG-like thin films are highly capable of eliminating bacterial attachment on surfaces with relatively reduced protein attachment without having any toxic effect. Previous statements were supported with SEM, XPS, FTIR spectroscopy, and contact angle analysis.

Towards a Long-Chain Perfluoroalkyl Replacement: Water and Oil Repellent Perfluoropolyether-Based Polyurethane Oligomers.

Original perfluoropolyether (PFPE)-based oligomeric polyurethanes (FOPUs) with different macromolecular architecture were synthesized (in one step) as low-surface-energy materials. It is demonstrated that the oligomers, especially the ones terminated with CF3 moieties, can be employed as safer replacements to long-chain perfluoroalkyl substances/additives. The FOPU macromolecules, when added to an engineering thermoplastic (polyethylene terephthalate, PET) film, readily migrate to the film surface and bring significant water and oil repellency to the thermoplastic boundary. The best performing FOPU/PET films have reached the level of oil wettability and surface energy significantly lower than that of polytetrafluoroethylene, a fully perfluorinated polymer. Specifically, the highest level of the repellency is observed with an oligomeric additive, which was made using aromatic diisocyanate as a comonomer and has CF3 end-group. This semicrystalline oligomer has a glass transition temperature (Tg) well above room temperature, and we associate the superiority of the material in achieving low water and oil wettability with its ability to effectively retain CF3 and CF2 moieties in contact with the test wetting liquids.

Highly Oil-Repellent Thermoplastic Boundaries via Surface Delivery of CF3 Groups by Molecular Bottlebrush Additives.

We fabricated thermoplastic surfaces possessing extremely limited water and oil wettability without employment of long-chain perfluoroalkyl (LCPFA) substances. Namely, by taking advantage of the structure and behavior of original oleophobic perfluoropolyether (PFPE) methacrylate (PFM) molecular bottlebrush (MBB) additive we obtained polymeric surfaces with oil contact angles well above 80° and surface energy on the level of 10 mN/m. Those angles and surface energies are the highest and the lowest respective values reported to date for any bulk solid flat organic surface not containing LCPFA. We show experimentally and computationally that this remarkable oil repellency is attributed to migration of small quantities of the oleophobic MBB additives to the surface of the thermoplastics. Severe mismatch in the affinity between the densely grafted long side chains of MBB and a host matrix promotes stretching and densification of mobile side chains delivering the lowest surface energy functionalities (CF3) to the materials' boundary. Our studies demonstrate that PFM can be utilized as an effective low surface energy additive to conventional thermoplastic polymers, such as poly(methyl methacrylate) and Nylon-6. We show that films containing PFM achieve the level of oil repellency significantly higher than that of polytetrafluoroethylene (PTFE), a fully perfluorinated thermoplastic. The surface energy of the films is also significantly lower than that of PTFE, even at low concentrations of PFM additives.

Attitudes toward the elderly among young family physicians in Turkey.

INTRODUCTION: General practitioners'(GPs) role is important as they are easily accessible especially for elderly. Young GPs need to improve their attitudes toward the elderly so that they can be a part of solution for health problems of elderly in the future. The aim of this study is to determine attitudes of young GPs toward elderly by the University of California at Los Angeles Geriatrics Attitude Scale (UCLA-GAS). METHODS: It is a cross-sectional study performed with questionnaires including UCLA-GAS. The study population was 260 young doctors (GP residents and GPs in their first 5 years after qualification). Statistical evaluation of the data included percentage, mean, and Kolmogorov-Smirnov test and analysis of variance test. RESULTS: Of the participants, 58.1% (n = 151) were women, 35.4% (n = 94) of them were GPs, and the remaining were GP residents. The mean age was 31.30 ± 5.40 years (range = 24-55 years). The mean score of UCLA-GAS was 46.85 ± 5.63 (range = 30-61). Participants ≤30 years of age had significantly higher scores (47.70 ± 5.99) than age above 30 years (45.68 ± 4.89) (P = 0.003). There was no statistically significant difference between GP residents and GPs (P = 0.989) and between participants who had rotation in elderly healthcare service (n = 63) or not (n = 197) (P = 0.383). However, as the duration of work increased, the score of UCLA-GAS decreased significantly (r = -0.216, P < 0.001). CONCLUSION: Young doctors who were interested in elderly showed more positive attitude as expected. However, the ones who were older and worked longer had less positive attitude. It seems important to understand and prevent this unfavourable attitude with formal education system about elderly healthcare during residency.

Brucella glomerulonephritis and prosthetic valve endocarditis: a case report.

Although brucellosis is an endemic disease in Mediterranean countries, there are few reported cases of Brucella endocarditis and glomerulonephritis. We report a case of Brucella prosthetic mitral valve endocarditis and glomerulonephritis that could be managed by using only antibiotic therapy, including rifampicin, doxycycline and ceftriaxone, without a surgical procedure.