Synthesis of phosphazene containing polymer via ATRP method and investigation of dielectric properties

Bu çalışmada önce, 2,2-bis[(4-(klorasetiloksi)imino)-2-metoksifenoksi)-4,4,6,6,-bis[spiro(2’,2’’-dioksi1’,1’’- bifenilil)siklotrifosfazen sentezlendi. Sentezlenen fosfazen türevi, metil metakrilat ve n-bütil metakrilat monomerlerinin ATRP metoduyla polimerleşme reaksiyonlarında başlatıcı olarak kullanıldı. Sentezlenen maddelerin yapı karakterizasyonunda FT-IR, 1H ve 31P-NMR teknikleri kullanıldı. Termal davranışları DSC ve TGA ile ölçüldü. Ortalama molekül ağırlıkları ve heterojenlik indisleri GPC aletiyle ölçüldü. Sentezi yapılan polimerlerin dielektrik ölçümleri, impedans analizör cihazıyla, dielektrik sabiti, dağıtma faktörü gibi dielektrik davranışları sabit sıcaklıkta 50 Hz ile 2000 Hz frekans aralığında ölçülmüştür.In this work, 2,2-bis [(4- (chloracetyloxy) imino) -2-methoxyphenoxy) -4,4,6,6- bis [spiro (2 ', 2' '- dioxy-1', 1''- biphenylyl) cyclotriphosphazene was synthesized and it was used as an initiator in the polymerization reactions of methyl methacrylate and n-butyl methacrylate monomers via ATRP method. The structure and the thermal behavior of synthesized materials were analyzed by FT-IR, 1H, 31P-NMR, DSC and TGA techniques. The average molecular weights and heterogeneity indices were measured by GPC instrument. Dielectric measurements of the synthesized polymers such as dielectric constant, dispersion factor, at constant temperature in the frequency range of 50 Hz to 2000 Hz were measured by the impedance analyzer device

Karyological studies of the 2n=60 cytotype of Nannospalax nehringi from Central Anatolia

Yagci, Tuba/0000-0003-1705-5107WOS: 000319318200007In this study, the G-bands and nucleolus organizer regions (NORs) of the 2n = 60 chromosomal form of Nannospalax nehringi from Central Anatolia (Konya) are presented. The karyotype possesses nine pairs of submetacentric and subtelosentrics and 20 pairs of acrocentric autosomes gradually decreasing in size (fundamental number = 80 and autosomal fundamental number = 76). NORs were localized in the telomeric regions of the short arms of three large pairs and one medium-sized pair of subtelocentric autosomes (nos. 1, 3, 4, 9)

Karyotypic studies of Meriones dahli Shidlovsky, 1962 (Rodentia: Muridae) from Turkey

Demirbas, Yasin/0000-0002-3264-3444; Yagci, Tuba/0000-0003-1705-5107WOS: 000296747100007In this study, conventionally stained, C- and Ag-NOR banded karyotypes of Dahl's jird, Meriones dahli, were reported from Turkey. The species had a karyotype of 2n=50, NFa=74 and NF=78. The X and Y chromosomes were submetacentrics in all specimens examined. Blocks of constitutive heterochromatin were located in the pericentromeric areas of autosomes including the X and Y chromosomes. Interstitial C- bands are also detected in the long arms of one of the largest acrocentric pairs. Nucleolar organizer regions (NORs) were located at the telomeric regions of the short arms of three submetacentrics and two acrocentrics