 |
|
|
|
以作者查詢圖書館館藏 、以作者查詢臺灣博碩士 、以作者查詢全國書目 、勘誤回報 、線上人數：36 、訪客IP：18.222.22.244
姓名 郭依蓁(Yi-chen Kuo) 查詢紙本館藏 畢業系所 化學學系 論文名稱 由彎曲型分子形成盤狀液晶之探討
(The formation of the columnar phase by bent-core molecules)相關論文 檔案 [Endnote RIS 格式]
[相關文章]
[文章引用]
[完整記錄]
[館藏目錄]
至系統瀏覽論文 ( 永不開放)
摘要(中) 本論文研究主要的方向在於探討香蕉型液晶的製備、液晶相、與結構排列，研究的方向主要是延伸易筑萱學姐所做的具彎曲型化合物。論文中所有的化合物都經過NMR、Mass及元素分析鑑定其純度及結構，並由DSC量測得到液晶的相轉變溫度與熱焓值。
探討此系列化合物的主要原因在於筑萱學姐所合成出一系列的香蕉型B6相液晶，而我主要在學姐所合成的結構末端延長連接基並且改變碳數，進而探討結構的改變對原本液晶相造成的影響與變化。除了在偏光顯微鏡下觀察到液晶相由B6相變成盤狀液晶外，液晶相溫度範圍也拉長了約三十度左右，澄清點溫度也隨著上升。而此論文主要的方向便是在探討改變結構後，對分子所造成的液晶相性質之影響。
此系列分成兩個部分；第一部份主要是增加連接基後液晶相變化的探討，第二部分則是置換氫原子在可能產生分子內與分子間氫鍵的位置上，並與第一部份做比較，發現此部分某些化合物轉變成Smectic相，且伴隨著氫鍵的消失，澄清點溫度也跟著下降約二十五度C左右。因此結果得以確定分子間與分子內氫鍵對分子的排列以及液晶相確實會產生不可忽略的影響。摘要(英) This thesis describes the synthesis, characterization and mesomorphic properties of a series of organic compounds derived from N, N-(propan-2-ol)-bis(4-alkoxysalicylaldimine). These compounds are structurally considered as banana-shaped molecules or bent core (BC) molecules, and banana phases might be observed. All compounds prepared were characterized via 1H-NMR, 13C-NMR, mass spectroscopy, and elemental analysis. The mesophases were studied by polarized optical microscopy (POM), differential scanning calorimeter (DSC), and the structures of the mesophases were also confirmed by variable temperature X-ray diffraction experiments.
The results were compared with other similar compounds prepared previously in this group. A systematic change on the molecular structures was conducted to understand the effect of molecular structures on the mesomorphic behavior, in which compounds substituted with a variety of functional groups/substituents and/or terminal chain lengths were prepared and studied. A phase changed from B6 phase to columnar phase was obtained, and also the temperature range of the mesophase was increased by ca. 300C. The replacement of H atom at different position was found to induce the formation of smectic phases. In addition, the effect of possible hydrogen bonding induced to generate the mesophases was also investigated.關鍵字(中) ★ 分子間氫鍵
★ 香蕉形液晶
★ 自組裝
★ 鐵電性質關鍵字(英) ★ self-assembly
★ H-bonding
★ ferroelectricity
★ banana LC論文目次 謝誌·····································································V
目錄····································································VI
圖目錄··································································IX
表目錄·································································XII
附圖目錄······························································XIII
中文摘要·······························································XIV
Abstract································································XV
第一章緒論·····························································1
壹、前言： ···························································2
貳、發現液晶： ·······················································2
參、常見的液晶： ·····················································3
（一）向列型液晶相(Nematic mesophase)····························3
（二）層列型液晶相(smectic mesophase)····························4
（三）盤狀液晶分子(columnar mesophase)···························5
（四）無機液晶···················································7
（五）膽固醇型液晶（cholesteric mesophase） ······················8
（六）香蕉型液晶分子·············································9
Ⅰ.B1相······················································10
Ⅱ.B2相······················································11
Ⅲ.B3相······················································15
Ⅳ.B4相······················································16
Ⅴ.B5相······················································17
Ⅵ.B6相······················································19
Ⅶ.B7相······················································19
肆、研究動機························································24
第貳章實驗部分························································25
壹、實驗藥品························································26
貳、實驗儀器························································27
一、核磁共振光譜儀··············································27
二、熱微差掃瞄分析儀············································27
三、偏光顯微鏡··················································28
四、元素分析儀··················································29
五、質譜分析儀··················································29
六、粉末X-ray繞射儀（XRD） ·····································29
七、變溫紅外線光譜儀············································31
參、實驗流程························································32
一、合成步驟····················································32
二、實驗步驟····················································33
1. Methyl 4-(octyloxy)benzoate之合成·······················33
2. 4-(Octyloxy)benzoic acid之合成··························35
3. 4-[4-(Octyloxy)benzoyloxy]salicylaldehyde之合成··········37
4. 4-[4-(Octyloxy)benzoyloxy]benzaldehyde之合成·············40
5.N,N-(Propan-2-ol)-bis[4-(4-octyloxy)benzoyloxy]
salicylaldimine之合成······································40
6.2,2-Dimethyl-N,N-propane-bis[4-(4-octyloxy)benzoyloxy]
salicylaldimine之合成·······································42
7.N,N-(propan-2-ol)-bis[4-(4-octyloxy)benzoyloxy] benzaldimine
之合成······················································43
第三章結果與討論·······················································45
壹、化合物合成之反應機構探討········································46
一、醚化反應 ( Williamson ether synthesis )·····················46
二、酯化反應····················································46
三、Schiff base反應·············································47
貳、實驗結果與討論··················································48
一、化合物之代稱················································48
二、化合物純度鑑定··············································49
三、光學紋理圖··················································49
四、DSC數據圖表·················································52
五、粉末X-ray繞射＆分子模擬及IR數據之比較·····················53
六、化合物其他之物性············································64
結論····································································65
參考文獻································································66
附圖····································································69參考文獻 [1] 廖晉逸，「側環取代基與尾端側鏈對香蕉形分子液晶性質影響之研究」，國立台灣大學，碩士論文，民國94年
[2] G. W. Gray, J. W. Goodby, Smectic Liquid Crystals-Textures and Structures Leonard Hill, 1984
[3] Takashi Kato, Norihiro Mizoshita, and Kenji Kishimoto, Angew. Chem. Int. Ed. 2006, 45, 38-68
[4] 易筑萱，「新穎香蕉形液晶及對稱含萘環之液晶分子」，國立中央大學，碩士論文，民國94年
[5] R. W. Date, E. F. Iglesias, K. E. Rowe, James M. Elliott and Duncan W.Bruce, Dalton Trans.,2003,1914–1931
[6] I, Paraschiv, M, Giesbers, E. J. R. Sudholter, Chem. Mater., 2006, 18, 4,968
[7] E. J. Foster, C. Lavigueur, Y. C. Ke and V. E. Williams, J. Mater. Chem., 2005, 15, 4062–4068
[8] Takashi Kato, Norihiro Mizoshita, and Kenji Kishimoto, Angew. Chem. Int. Ed. 2006, 45, 46
[9] T. Sekine, T. Niori, M. Sone, J. Watanabe, S. W. Choi, Y. Takanishi, H. Takezon, Jpn. J. Appl. Phys. 1997, 36, 6455
[10] H. N. S. Murthy and B. K. Sadashiva, Liquid Crystals, 2002, 29,1223
[11] J. P. Bedel, J. C. Rouillon, J. P. Marcerou, M. Laguerre, H. T. Nguyena and M. F. Achard, J. Mater. Chem., 2002, 12, 2214
[12] G. Pelzl, S. Diele and W. Weissflog, Adv. Mater., 1999, 11, 707
[13] J. C. Rouillon, J. P. Marcerou, M. Laguerre, H. T. Nguyena and M. F. Achard, J. Mater. Chem., 2001, 11, 2946–2950
[14] V. Novotna, M. Kaspar,a V. Hamplova, M. Glogarova, L. Lejcek,a J. Kroupaa and D. Pociecha, J. Mater. Chem., 2006, 16, 2031–2038
[15] Hiroko Niwano, Michi Nakata, Jirakorn Thisayukta, Darren R. Link, Hideo Takezoe, and Junji Watanabe, J. Phys. Chem. B, 2004, 108, 14889-14896
[16] Wolfgang Weissflog, Ulrike Dunemann, Martin W. Schroder, Siegmar Diele, Gerhard Pelzl,Horst Kressea and Siegbert Grande, J. Mater. Chem., 2005, 15, 939–946
[17] Gerhard Pelzl, Siegmar Diele, and Wolfgang Weissflog, Adv. Mater., 1999, 11, 707-724
[18] Miroslav Kaspar, Vera Hamplova , Vladimra Novotna, Milada Glogarova and Premysl Vanek, J. Mater. Chem., 2002, 12, 2221–2224
[19] J. Thisayukta, H. Takezoe and J. Watanabe, Jpn. J. Appl. Phys., 2001, 40, 3277-3287
[20] Hajnalka Nadasi, Wolfgang Weissflog, Alexey Eremin, Gerhard Pelzl, Siegmar Diele, B. Dasb and Siegbert Grande, J. Mater. Chem., 2002, 12, 1316–1324
[21] W. Weissflog, I. Wirth, S. Diele, G. Pelzl, H. Schmalfuss, Liq. Cryst.,2001, 28, 1603
[22] J. C. Rouillon, J. P. Marcerou, M. Laguerre, H. T. Nguyena and M. F.Achard, J. Mater. Chem., 2001, 11, 2946
[23] R. A. Reddy, B. K. Sadashiva and V. A. Raghunathan, Chem. Mater., 2004, 16, 4050
[24] D. Shen, S. Diele, G. Pelzl, I. Wirthb and C. Tschierske, J. Mater.Chem., 1999, 9, 661
[25] 林倞，「香蕉形無機液晶」，國立中央大學，碩士論文，民國94年
[26] D. A. Coleman, J. Fernsler, N. Chattham, M. Nakata, Y. Takanishi, E. Körblova, D. R. Link, R. –F. Shao, W. G. Jang, J. E. Maclennan, O.Mondainn-Monval, C. Boyer, W. Weissflog, G. Pelzl, L. –C. Chien, J.Zasadzinski, J. Watanabe, D. M. Walba, H. Takezoe, N. A Clark, Science, 2003, 301, 1204.
[27] Antal Jákli, Possible applications of bent-core liquid crystals, Liquid Crystal Institute,Kent State University, Kent, OH 44242, USA
[28] 王怡文，「以benzoxazole為架構之無機桿狀液晶」，國立中央大學，碩士論文，民國95年
[29] Maja Sÿepelj, Andreja Lesac, Ute Baumeister, Siegmar Diele, Duncan W. Bruce, and Zdenko Hamersak, Chem. Mater. 2006, 18, 2050-2058
[30] Y. MATSUNAGA and T. HOSODA, Mol. Cryst. Liq. Cryst., 1999, 326, 369-380
[31] 宋建宏，國立中央大學，碩士論文，民國88年指導教授 賴重光(C. K. Lai) 審核日期 2007-7-24 推文 plurk
funp
live
udn
HD
myshare
netvibes
friend
youpush
delicious
baidu
網路書籤 Google bookmarks
del.icio.us
hemidemi
facebook
twitter
google
reddit