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Browsing by Author "Coplan, Meryem"

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    Article
    Citation - WoS: 8
    Citation - Scopus: 7
    Anti-Fogging Surfaces Produced by Plasma Polymerization of Acrylic Acid
    (Elsevier Science Sa, 2024) Coplan, Meryem; Gürsoy, Mehmet; Karaman, Mustafa
    In this paper, plasma enhanced chemical vapor deposition (PECVD) of acrylic acid (AA) was employed as a onestep and solvent-free technique to prepare durable organic anti-fogging coatings on mirror and glass surfaces. The effects of important PECVD parameters including substrate temperature and plasma power on the deposition kinetics, as well as on the structural and morphological properties of the as-deposited films were investigated. Employing a low substrate temperature (5 C-degrees) and a high plasma power (30 W) combination resulted in the highest observed deposition rate of 27.7 nm/min. Fourier-transform infrared (FTIR) spectroscopy showed high structural resemblance between PECVD-PAA and reference poly(acrylic acid) (PAA). The PAA-deposited surfaces showed excellent and durable anti-fogging performance without any loss in their optical transparencies. Successive antifogging tests showed that the PAA thin film exhibited high functional durability without delamination, indicating that it can be used in real-world applications.
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    Master Thesis
    İtakonik Asidin Organofosforik Özütleyiciler Kullanılarak Sulu Çözeltilerden Tepkimeli Özütlenmesi
    (Konya Teknik Üniversitesi, 2021) Coplan, Meryem; Martı, Mustafa Esen
    İtakonik asit, biyobozunur polimerik malzemelerin sentezinde kullanılabilen çok yönlü bir dikarboksilik asittir. Buna ek olarak ilaç, boya, reçine, biyo-yakıt ve medikal ürünlerin sentezinde yaygın olarak kullanılmaktadır. Artan talep ve mevcut yöntemlerin ekonomik ve çevresel yetersizlikleri yeni üretim ve ayırma yöntemlerinin geliştirilmesini gerektirmiştir. Bu tez çalışmasında itakonik asidin sulu çözeltilerden tepkimeli özütleme yöntemi ile ayrımı araştırılmıştır. Çalışmada bir organofosforik özütleyici olan trioktilfosfin oksit (TOPO) kullanılmıştır. İtakonik asit derişimi 0,05-0,5 mol/L arasında iken TOPO derişimi 0,2 ile 0,8 mol/L aralığında olmuştur. Organik fazda çözücü olarak toluen, metil izobütil keton (MIBK), oktanol ve dekanol test edilmiştir. Fiziksel özütleme deneylerinde toluen ile itakonik asidin organik faza aktarılamadığı fakat MIBK, oktanol ve dekanol ile aktarıldığı gözlenmiştir. Sabit özütleyici derişiminde artan başlangıç pH değeri ile birlikte geri kazanım verimi çözeltinin doğal pH değerine kadar yükselmiş sonrasında düşmüştür. En yüksek geri kazanım verimine çözeltinin doğal pH değerinde (pH= 2,14) erişilmiştir. Sistem 60 dakikada dengeye ulaşmıştır. Üç farklı sıcaklık noktasında elde edilen bulgular sıcaklık artışının ayırma verimine olumsuz etkisini göstermiştir. En yüksek ayırma verimleri toluen ve MIBK ile sırasıyla %96,08 (KD= 24,50) ve %94,12 (KD= 16,00) olmuştur. Bu iki çözücü için TOPO derişiminin artmasıyla geri kazanım verimi artarken asit derişiminin artması ile verim düşmüştür. Yükleme değerleri birden düşük olmuştur. Sonuçlar TOPO özütleyicisinin itakonik asit geri kazanımı için uygun bir çözücü ile birlikte kullanılabileceğini göstermiştir.
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    Article
    Pressure-Sensitive Adhesive Thin Films with Tailored Properties via Solvent-Free Plasma Deposition of EHA/AA Copolymers
    (Elsevier, 2025) Coplan, Meryem; Gursoy, Mehmet; Mercan, Emine Sevgili; Karaman, Mustafa
    This study employs plasma-enhanced chemical vapor deposition (PECVD) to address the limitations of conventional techniques in fabricating pressure-sensitive adhesive (PSA) thin films and to introduce advanced functionalities. PECVD provides a solvent-free, environmentally sustainable approach, allowing precise control over film composition and properties. PSA thin films were synthesized using varying feed ratios of 2-ethylhexyl acrylate (EHA) and acrylic acid (AA) monomers. The optimized PSA film was synthesized at a substrate temperature of 5 degrees C, reactor pressure of 150 mTorr, plasma power of 50 W, and an AA/EHA monomer flow rate ratio of 1.5. The chemical, physical, and mechanical characteristics of the films were systematically evaluated. The optimized film demonstrated a shear strength of 158 N/cm2 and a peel strength of 0.87 N/25 mm. Furthermore, the film exhibited excellent solvent resistance and high durability.
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    Article
    Citation - Scopus: 1
    Synthesis and Characterization of Stretchable Isoprene-Acrylic Acid Copolymer Thin Films
    (Elsevier Science Sa, 2024) Coplan, Meryem; Yorulmaz, Merve; Gursoy, Mehmet; Karaman, Mustafa
    Copolymer thin films of isoprene with acrylic acid were synthesized using PECVD. In that way, the stretchable functionality of polyisoprene (PI) was combined with the hydrophilic functionality of poly(acrylic acid) (PAA) to obtain stretchable thin films with adjustable wettabilities. Deposition rates were found to change between 9 and 5.5 nm/min depending on the monomer flowrates. The analysis of water contact angle (WCA) values indicated that films having more AA units in their structures were more wettable. The stretchability of the films was assessed on laboratory gloves through stretch-release test and on PET sheet through bend-release test. No significant changes in the WCA values with no observable cracks and failures after successive tests were indication of stretchability of the copolymer films.
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