Synthesis, characterization, thermal and electrical behaviors of a new methacrylate polymer bearing chalcone and hydroxyl side groups

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-(4metoksifenil)prop-2-en-1on) bileşiği ile epiklorhidrin etkileştirilerek 3-(4-metoksifenil)-1-(4-(oksiran-2ylmetoksi) 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.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-(4hydroxyphenyl)-3-(4-methoxyphenyl)prop-2-en-1-yl) compound and epichlorohydrin. Afterwards, 2hydroxy-3-(4-3-(4-methoxyphenyl)acryloyl)phenoxy)propyl methacrylate (MKAL-MET) monomer was obtained from the reaction of EP-MKAL with methacrylic acid. The homopolymer P(MKAL-MET) was prepared by the free radical polymerization method. The structures of compounds were characterized by FT-IR, 1H and 13C-APT NMR 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 (298K, 318K, 333K, 353K). Dielectric constant, dielectric loss and ac conductivity of P(MKAL-MET) were determined 5.34, 3.73 and 1.08x10-8 S/cm, respectively at room temperature and 1 kHz. 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

Synthesis, structural characterization and dielectric behavior of new oxime-cyclotriphosphazene derivatives

The cyclotriphosphazene compound (2) bearing formyl groups as side groups was obtained from the reaction of 2,2-Dichloro-4,4,6,6-bis[spiro(2′,2″-dioxy-1′,1″-biphenylyl)]cyclotriphosphazene (1) with 4-hydroxy-3-methoxybenzaldehyde in the presence K2CO3 in tetrahydrofuran. Oxime-cyclotriphosphazene compound (3) was synthesized from the reaction of compound 2 with hydroxylamine hydrochloride in pyridine. The synthesized oxime-phosphazene compound (3) was reacted with alkyl and acyl halides. As a results, the cyclotriphosphazene compounds (1–10) bearing oxime ether and ester as side groups were obtained. The chemical structures of these compounds (1–10) were determined by elemental analysis, FT-IR, 1H, 13C and 31P NMR spectroscopic methods. Dielectric constant, dielectric loss factors and conductivity properties of cyclotriphosphazene compounds were measured over the frequency range from 100 Hz to 2 kHz at 25 °C and compared with each other. It is found that ester substituted cyclotriphosphazenes have higher dielectric constant. Our study suggests that these phosphazenes promising candidate materials in multifunctional optoelectronic devices.Sponsor Kurum: Fırat Üniversitesi Finansman Kodu: FF.11.2

Eu+3-doped chalcone substituted cyclotriphosphazenes: Synthesis, characterizations, thermal and dielectrical properties

A series of new cyclotriphosphazene derivatives (2a-e) were prepared from the reactions of substituted chalcone compounds (1a-e) containing different organic side groups at para position with cyclotriphosphazene (2) bearing dioxybiphenyl. The structures of 2a-e were approved by microanalysis and spectroscopic techniques (MS, FT-IR, 31P, 1H, 13C, and 13C-APT NMR). The thermal behaviors of compounds 2a-e were investigated by thermogravimetric analysis (TGA). These compounds were found to be stable up to about 300 °C. Dielectric properties of 2a-e were measured against temperature (between 25 and 160 °C at 1 kHz) and frequency (range from 100 Hz to 5 kHz at 25 °C) using means of an impedance analyzer. Among them dielectric properties of methoxy substituted cyclotriphosphazene 2e were found to be higher than other phosphazenes. The compound 2b, which has the lower dielectric property values than other phosphazenes, was selected to determine the influence of Eu+3-doping on the dielectric properties of phosphazenes and doped with Eu+3 at different mole ratios. At the dielectric properties of Eu+3-doped compound 2b (with increasing molar ratios of Eu+3) was observed an excellent increasing according to Eu+3-undoped phosphazene compounds.Sponsor Kurum: Fırat Üniversitesi Finansman Kodu: FF.12.1

Preparation and Characterization of Styrene Bearing Diethanolamine Side Group, Styrene Copolymer Systems, and Their Metal Complexes

The two copolymer systems of styrene bearing diethanol amine side group and styrene were prepared by free radical polymerization method at 60°C in presence of 1,4-dioxane as solvent and AIBN as initiator. Their metal complexes were prepared by reaction of the copolymer used as ligand P(DEAMSt-co-St)L′′ and Ni(II) and Co(II) metal ions, which was carried out in presence of ethanol and NaOH at 65°C for 48 h in pH = 7.5. The structures of the copolymers used as ligand and metal complexes were identified by FT-IR, 1H-NMR spectra, and elemental analysis. The properties of the copolymers used as ligand and metal complexes were characterized by SEM-EDX, AAS, DSC, TGA, and DTA techniques. Then, the electrical properties of the copolymers and metal complexes were examined as a function of the temperature and frequency, and the activation energies (Ea) were estimated with conductivity measurements

Effects of Waste Polypropylene Additive on the Properties of Bituminous Binder

2nd International Materials, Industrial, and Manufacturing Engineering Conference, MIMEC2015 -- FEB 04-06, 2015 -- Bali, INDONESIAWOS: 000380490700029In this study, a polymer which have a content of 80% wasted polypropylene and other materials, such as maleic anhydride and styrene known as compatible with bitumen was synthesised and employed as a modifier in bitumen. After the polymer (PPr) synthesizing, base and polymer modified bitumens were investigated by means of florescent microscope, penetration, softening point, rotational viscometer (RV) and dynamic shear rheometer (DSR) tests. The results indicated that PPR modifier provides an increased stiffness for bitumen. For instance, the binder having % 6 PPR has a penetration of 27 dmm, softening point value of 76 degrees C, viscosity of 687.5 cP whereas base bitumen has a penetration of 62dmm, softening point of 50.5 degrees C and viscosity of 412 cP. Stiffening effect of the PPr was also approved by complex modulus (G*) values in DSR tests. Better viscoelastic behaviour was observed by means of DSR test after the modification. In addition to importance of employing waste polymers in pavements in terms of economic and environmental care, the results indicate the positive effect of the waste polymer on the performance of bitumen and against of rutting in asphalt concrete. (C) 2015 The Authors. Published by ELsevier B.V

Yeni 2,2,4,4-tetra(4′- oksi-ssübstitüe-kalkon)-6,6-difenilsiklotrifosfazen türevlerinin, sentezi, yapısal ve termal karakterizasyonu, dielectrik özellikleri ve in vitro sitotoksik aktiviteleri

In this study, we aimed to investigate the relationship between the cytotoxic and dielectric properties of newly synthesized 2,2,4,4-tetra(4′-oxy-substituted-chalcone)- 6,6-diphenylcyclotriphosphazene derivatives (3–10). Firstly, 2,2,4,4-tetrachloro-6,6-diphenyl cyclotriphosphazene (2) was obtained through Friedel Crafts alkylation in the presence of hexachlorocyclotriphosphazene, benzene and triethylamine and anhydrous AlCl3. The compounds 3–10 were synthesized from the reaction of the hydroxychalcone compounds (1a–h) with 2 in the presence of K2CO3 and within the acetone solvent for the first time and their dielectric constant, dielectric loss factor and ac conductivity of compounds 3–10 were examined through the impedance analyzer as a function of frequency. The in vitro cytotoxic activities of compounds 3–10 in five different concentrations (1, 5, 25, 50, and 100 µM) were analyzed by colorimetric MTT assay which is based on reduction of MTT salt by mitochondria of alive cells over the human ovarian cancer (A2780) and human prostate cancer (PC-3 and LNCaP) cell lines. The LogIC50 values of 3–10 were calculated by using a Graphpad prism 6 programs on a computer. The obtained results suggests that the compounds have a powerful cytotoxic activity (especially A2780, p < 0.05).This work was supported financially by The Scientific & Technological Research Council of Turkey (TUBITAK) (Project Number: 115Z101)