Yeni Kiral Yan Zincir Sıvı Kristal Homopolimerlerin Sentezi ve Karakterizasyonu

Yıl 2012, Cilt: 14 Sayı: 1, 103 - 111, 01.06.2012

Hülya Elmalı Gülbaş Yeşim Hepuzer Gürsel Belkıs Bilgin Eran

Öz

Bu çalışmada,kiral yan zincirlere sahip imin bileşiklerinin (M1-M3) dizaynı ve sentezi gerçekleştirilmiştir. Olefinik uca sahip monomerlerin başlatıcı olarak AIBN varlığında gerçekleştirilen serbest radikal polimerizasyonu ile yan zincir sıvı kristal homopolimerleri (P1-P3) elde edilmiştir. Sentezlenen tüm monomerlerin ve homopolimerlerinin yapıları, standart spektroskopik yöntemler (UV, IR, 1H-NMR,13CNMR, MS) ile aydınlatılmış, mesomorfik özellikleri polarizasyon mikroskobu (POM) ve diferansiyel tarama kalorimetrisi (DSC) ile incelenmiştir. Yan zincir sıvı kristal homopolimerleri P1-P3’in ortalama molekül ağırlığı Jel Geçirgenlik Kromatografisi (GPC) ile belirlenmiştir

Anahtar Kelimeler

Kiral imin, sıvı kristal, yan zincir sıvı kristal homopolimerler

Synthesis and Characterization of New Chiral Side Chain Liquid Crystal Homopolymers

Öz

In this study, imines compound having chiral side chains (M1-M3) were designed and synthesized. Side chain liquid crystalline homopolymers (P1-P3) of olefinic monomers were prepared in the presence of AIBN as an initiator by using free radical polymerization route. The structure of monomers and homopolymers were characterized by standart spectroscopic methods (UV-VIS, IR, 1H-NMR, 13C-NMR and MS). The mesogenic behaviours of all the synthesized monomers and their homopolymers examined with differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The molecular weight of the polymers detected by using gel permeation chromatograpy (GPC) measurements

Anahtar Kelimeler

Chiral ımines, liquid crystal, side chain liquid crystalline homopolymers

Kaynakça

• [1] Shibaev, V.P., Plate, N.A., Liquid Crystalline Polymers, Polymer Science U.S.S.R., 19(5), 1065-1122, (1977).
• [2] Noel, C., Navard,P., Liquid Crystalline Polymers, Progress in Polymer Science, 16(1), 55-110, (1991).
• [3] Percec, V., Pugh, C., Side Chain Liquid Crystal Polymers, Ed. McArdle, C.B., Blackie and sons , New York, (1989).
• [4] Baron, M., Stepto, R.F.T., Defenitions of Basic Terms Relating to Polymer Liquid Crystals , Pure Appl. Chem., 74 (3), 493-509, (2002).
• [5] Shibaev, V. P., Lam, L., Liquid Crystalline and Mesogenic Polymers, Springer, (1994).
• [6] Demus, D., Goodby, J., Gray, G.W., Spiess, H.W., Vill, V., Handbook of Liquid Crystals, Volume 3, First Edition, Wiley-VCH, Weinheim, (1998).
• [7] Aoki, Y., Matsushima, K., Taroura, T., Hirose, T., Nohira, H., Mol. Cryst. Liq. Cryst., 398: 189-193, (2003).
• [8] Varga, A., Pozsgay, G. Y., Valentini, P., Peridica Polytechnica, Ser. Chem. Eng., 43: 17-33, (1999).
• [9] Merlo, A.A., Ritter, O., Pereira, F. Silveira, N.P., J.Braz.Chem.Soc.,12:184-191 (2001).
• [10] Cankurtaran. O., Yasa-Sahin, O., Yazici, O., Karaagac, B., Bilgin-Eran, B., Karaman, F., A new liquid crystal of considerable value for the seperation of closely related solvent by gas chromatography, Liquid Crystals, 37, 9, 1111- 1118, (2010).
• [11] Chen, S. H., Maa, Y. F., Reexamination of the synthesis of liquid crystalline side-chain polyacrylates via liquid-liquid phase transfer catalysis, Macromolecules, 21, 904-907, (1988).
• [12] Braun, D., Herr, R. P., Arnold, N., Liquid crystalline polysulfones, 1 copolymers of 1-alkenes with sulfur dioxide, Makromolecular Chemistry., rapid Commun., 8:359-363, (1987).
• [13] Whang, X., Zhou, Q., Liquid Crystalline Polymers, World Scientific Publishing, Singapore, (2004).
• [14] Nesrullajev, A., Bilgin-Eran, B., Yılmaz Canlı, N., (2008). "Characterization and investigation of the mesogenic, thermo-morphologic and thermotropic properities of new chiral (S)-5-octyloxy-2-[{4-(2-methylbuthoxy)-phenylimino}-methyl]- phenol liquid crystalline compound", Material Chemistry and Physics, 111: 555- 558.
• [15] Otterholm, B., Nilsson, M., Lagerwall, S.T., Skarp, K., Liquid Crystals, 2, 757- 769, (1987).