Kalkon ve Hidroksil Yan Grupları İçeren Yeni Metakrilat Polimerinin Sentezi, Karakterizasyonu, Termal ve Elektriksel Davranışları

Year 2019, , 544 - 555, 31.12.2019

Fatih Biryan

https://doi.org/10.35414/akufemubid.544804

Cited By: 2

Abstract

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.

Keywords

Dielektrik Özellik, Termal Kararlılık, Dielektrik Sabiti, Aktivasyon enerjisi, Kompozit

A new methacrylate Monomer Bearing Chalcone and Hydroxyl Side Groups: Homopolymerization, Characterization, Thermal and Electrical Behaviors

Abstract

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.

Keywords

Dielectric Property, Thermal Stability, Dielectric Constant, Activation Energy, Composite

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