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Bu çalışmada, yan grupta kalkon ve hidroksil grubu bulunan yeni metakrilat polimerinin dielektrik ve termal özelliklerinin incelenmesi amaçlanmıştır. Bu amaç için ilk olarak 1-(4-hidroksifenil)-3-(4-metoksifenil)prop-2-en-1on) bileşiği ile epiklorhidrin etkileştirilerek 3-(4-metoksifenil)-1-(4-(oksiran-2-ylmetoksi) fenil)prop2-en-1-on (EP-MKAL) bileşiği sentezlendi. İkinci olarak EP-MKAL ile metakrilik asitin reaksiyonundan 2-hidroksi-3-(4-3-(4-metoksifenil)akriloil)fenoksi)propil metakrilat (MKAL-MET) monomeri elde edildi. Daha sonra bu monomerin serbest radikalik polimerizasyon yöntemi ile homopolimeri P(MKAL-MET) hazırlandı. Sentezlenen bileşiklerin ve polimerin yapı karakterizasyonları FT-IR, 1H ve 13C-APT NMR yöntemleri kullanılarak yapıldı. Polimerin termal davranışları DSC ve TGA termal analiz metotları ile belirlendi. Farklı ısıtma hızlarında (5, 10, 20, 30 ve 40 oC/dk) ölçülen TGA sonuçlarından Flynn-Wall-Ozawa (F-W-O) yöntemine göre polimerin ortalama aktivasyon enerjisi 141,26 kJ/mol olarak hesaplandı. P(MKAL-MET)’in dielektrik sabiti, dielektrik kayıp faktörü ve ac iletkenlik değerleri farklı sıcaklıklarda (298K, 318K, 333K, 353K) frekansın bir fonksiyonu olarak (100 Hz ile 30 kHz arasında) empedans analizör cihazı ile belirlendi. Polimerin 1 kHz sabit frekans ve oda sıcaklığındaki dielektrik sabiti, dielektrik kayıp faktörü ve ac iletkenlik değerleri sırasıyla 5,34; 3,73 ve 1,08x10-8 S/cm olarak bulundu. Ayrıca polimerin EuCl3 ile farklı oranlarda (ağırlıkça %3, %5 ve %10) kompozitleri hazırlanarak dielektrik özellikler üzerindeki etkisi araştırıldı. EuCl3 konsantrasyonu arttıkça dielektrik sabiti, dielektrik kayıp ve ac ilektkenlik değerlerinde, saf polimere göre önemli artış gözlendiği görülmüştür.
In this study, the aim is to study the dielectric and thermal properties of the new metacrylat polymer, which contains the calcon and hydroxyl group in the side group. For this purpose, the first composition of 1-(4-hydroxyfenil)-3-(4-metoxifenil)prop-2-en-1on) was synthesized by the 3-(4-metoxifenil)-1-(4-(oxidant-2-ylmetox) fenil)prop2-en-1-on (EP-MKAL) composition by interaction with epichlorhydrin. Secondly, from the reaction of metacrylic acid with EP-MKAL, the 2-hydroxy-3-(4-3-(4-metoxifenyl)acryloil)fenoxy)propyl metacrylate (MKAL-MET) monomers were obtained. The homopolymers P (MKAL-MET) were then prepared by the free radical polymerization method of this monomer. The structural characteristics of synthetic compounds and polymers were made using the FT-IR, 1H and 13C-APT NMR methods. The thermal behavior of the polymer was determined by the thermal analysis methods of DSC and TGA. From TGA results measured at different heating rates (5, 10, 20, 30 and 40 oC/min), the average activation energy of the polymer was calculated by Flynn-Wall-Ozawa (F-W-O) method at 141.26 kJ/mol. P(MKAL-MET)'s dielectric stability, dielectric loss factor and ac conductivity values were determined by the empedance analyzer device as a function of the frequency at different temperatures (298K, 318K, 333K, 353K). The dielectric stability, dielectric loss factor and ac conductivity values of the polymer at 1 kHz fixed frequency and room temperature were found at 5.34; 3.73 and 1.08x10-8 S/cm respectively. In addition, the effect of polymer on dielectrial properties was studied by preparing composites in different proportions (3, 5% and 10% of weight) with EuCl3. As the EuCl3 concentration increases, the dielectric stability, dielectric loss and ac deactivity values have been observed significantly increased compared to pure polymers.
The aim of this study is to determine the dielectric and thermal properties of the new methacrylate polymer with chalcone and hydroxyl groups at side group. For this purpose, firstly 3-(4-methoxyphenyl)-1-(4-(oxiran-2-ylmethoxy)phenyl)prop2-en-1-one (EP-MKAL) was synthesized by reacting (1-(4-hydroxyphenyl)-3-(4-methoxyphenyl)prop-2-en-1-yl) (OH-MKAL) compound and epichlorohydrin. Afterwards, 2-hydroxy-3-(4-3-(4-methoxyphenyl)acryloyl)phenoxy)propyl methacrylate (MKAL-MET) monomer was obtained from the reaction of EP-MKAL with methacrylic acid. Homopolymer P(MKAL-MET) was prepared in the presence of AIBN in dioxane solvent by the free radical polymerization method. The structures of compounds were characterized by FT-IR, 1H and 13C-APT NMR spectroscopy methods. The thermal behaviors of the polymer were determined by using DSC and TGA thermal analysis methods. According to the Flynn-Wall-Ozawa (F-W-O) method, the average decomposition activation energy of the polymer was determined as 141.26 kJ / mol with using of the TGA thermograms at different heating rates (5, 10, 20, 30 and 40 oC/min). The dielectric and electrical properties of P(MKAL-MET) were determined by the impedance analyzer (between 100 Hz and 30 kHz) as a function of frequency against increasing temperature. It was observed that the dielectric properties of the polymer were high in the structure with the effect of hydroxyl and chalcone groups and the dielectric properties changed with increasing frequency. In addition, 3%, 5% and 10% by weight EuCl3 composites were prepared, and their effects on dielectric properties were investigated. The increasing EuCl3 concentration, dielectric properties were significantly increased compared to pure polymer.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Ulusal
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