Dielectric and Thermal Properties of 2,2-(3-(Substitüted-fluorophenyl)- 1-(4-oxyphenyl)prop-2-en-1-one)-4,4,6,6-bis[spiro(2',2"-dioxy-1',1"- biphenylyl]Cyclotriphosphazenes

Yıl 2018, Cilt: 18 Sayı: 2, 458 - 467, 31.08.2018

Kenan Koran

Öz

In this study, it is aimed to determine the dielectric and thermal properties of side group substituted fluorine cyclotriphosphazene compounds. In this purpose, 4'-hydroxy-substituted chalcone compounds (1a-c) were initially synthesized by reacting 4'-hydroxyacetophenone with 2-fluorobenzaldehyde (a), 3- fluorobenzaldehyde (b) and 4-fluorobenzaldehyde (c) in ethanol solution in the presence of NaOH. Afterwards, 2,2-dichloro-4,4,6,6-[spiro(2',2''-dioxy-1',1''-biphenylyl)]cyclotriphosphazene (DPP) was obtained by reacting 2,2'-dioxybiphenol with hexachlorocyclotriphosphazene (HCP). The DPP compound was then reacted with the synthesized 1a-c compounds to obtain chalcone-substituted cyclotriphosphazene compounds (BPCP 1-3). The structures of the substituted cyclotriphosphazene compounds were characterized by FT-IR, 1H, 13C-APT and 31P-NMR spectroscopy methods, and the thermal behavior of the compounds was determined by DSC and TGA thermal analysis methods. The TGA results show that the compounds have a stable structure even at high temperatures. The dielectric constant, dielectric loss factor and AC conductivity values of phosphazene compounds (BPCP 1-3) were determined with an impedance analyzer (between 100 Hz and 30 kHz) as a function of frequency versus increasing temperature. In addition, the capacitance and dielectric constant values of the compounds decreased in increasing frequency and temperature and remained constant at high frequencies. The obtained results indicate that the BPCP 1-3 compounds are non-conductive.

Anahtar Kelimeler

Cyclotriphosphazene, Dielectric Property, Thermal Stability, Dielectric Constant, Phosphorous-Nitrogen, Compounds

2,2-(3-(Sübstitüe-florofenil)-1-(4-oksifenil)prop-2-en-1-one)-4,4,6,6- bis[spiro(2',2"-dioksi-1',1"-bifenilil]SiklotrifosfazenlerinDielektrik ve Termal Özellikleri

Öz

Bu çalışmada, yan grup olarak flor bulunan kalkonsübstitüesiklotrifosfazen bileşiklerinin dielektrik ve termal özelliklerinin belirlenmesi amaçlanmıştır. Bu amaçla ilk olarak 4'-hidroksiasetofenon ile 2-florobenzaldehit (a), 3-florobenzaldehit (b)ve 4-florobenzaldehit (c)NaOH varlığında etanol çözücüsünde etkileştirilerek 4'-hidroksi-sübstitüekalkon bileşikleri (1a-c) sentezlendi. İkinci olarak hekzaklorosiklotrifosfazen(HCP) ile 2,2'-dioksibifenolün reaksiyonundan 2,2-dikloro-4,4,6,6-[spiro(2',2''-dioksi-1',1''-bifenilil)]siklotrifosfazen (DPP) bileşiği elde edildi. Daha sonra sentezlenen 1a-c bileşikleri ileDPP bileşiği reaksiyona sokularak kalkonsübstitüesiklotrifosfazen bileşikleri (BPCP 1-3) sentezlendi.Sübstitüesiklotrifosfazen bileşiklerinin yapıları FT-IR, 1H, 13C-APT ve 31P-NMR spektroskopi yöntemleri ile doğrulandı ve bileşiklerin termal davranışları DSC ve TGA termal analiz metotları ile belirlendi. TGA sonuçları bileşiklerin yüksek sıcaklıklarda bile kararlı bir yapıya sahip olduğunu göstermiştir. Sentezleri gerçekleştirilen bu fosfazen bileşiklerinin (BPCP 1-3)dielektrik sabiti, dielektrik kayıp faktörü ve AC iletkenlik değerleri artan sıcaklığa karşı frekansın bir fonksiyonu olarak (100 Hz ile 30 kHz arasında) empedans analizörü ile belirlendi. BPCP 1-3 bileşiklerinin artan frekans ile dielektrik özellikleri değiştiği gözlendi. Ayrıca bileşiklerin kapasitans ve dielektrik sabiti değerleri artan frekans ve sıcaklıkta azalmakta ve yüksek frekanslarda sabit kaldığı gözlendi. Elde edilen sonuçlar neticesinde BPCP 1-3 bileşiklerinin yalıtkan özellik gösterdiği tespit edildi.

Anahtar Kelimeler

Siklotrifosfazen, Dielektrik Özellik, Termal Kararlılık, Dielektrik Sabiti, Fosfor-Azot Bileşikleri;

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