曲棍形液晶之研究

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Title:	曲棍形液晶之研究
Other Titles:	Study of Hockey Stick Mesogens
Authors:	余良杰
Contributors:	淡江大學化學學系
Keywords:	曲棍形分子;彎曲單元;3-烷氧基苯甲酸;3-烷氧基二苯乙烯;平層切換;立體阻障;Hockey stick molecule;bending unit;stilbene;3-substituted benzoate;in-planeswitching (IPS);steric hindrance
Date:	2009
Issue Date:	2010-04-15 15:39:00 (UTC+8)
Abstract:	以3-烷氧基苯甲酸或3-烷氧基二苯乙烯為彎曲單元並以寡聚二乙醇或二辛烷氧基為主幹之尾鏈合成曲棍形液晶分子。因為親水性或分支效應，預期會有較低溫度的液晶相。將以「平層切換」組態研究曲棍形分子之液晶相的電場應答性質。測量電場變化大小時液晶之透光率及應答速率。曲棍形分子之液晶相很有可能可運用於高資訊液晶顯示器。這些數據對設計新曲棍形分子會有幫助。在間位長鏈之鄰位接一稍大取代基以造成立體阻障，研究立體阻障對曲棍形分子可能存在之分子旋轉異構組態的影響，進而探討對曲棍形分子之液晶相的影響及液晶相的結構。這些數據有助於瞭解同傾層相及反傾層相之層內及層間之分子的排列關係。 Hockey stick molecules consist of 3-alkyloxybenzoic acid or 3-alkyloxy stilbene as bending unit and oligo-ethylene glycol or 2-octyloxy as end chain along the main skeleton are synthesized. Lower mesophase temperatures are expected for the hydrophilicity and branching effect. Mesophases of hockey stick mesogens will be investigated with the in-plane switching (IPS) mode. Transmittance and time constant are measured as function of applied electric field. The results of this IPS mode study would show that hockey stick mesogens are potential candidates for high density LCDs. The results will also provide information for further molecular modification. Effect of steric hindrance due to bulky substituent right next to the meta-chain on the mesophase structures and properties will be studied. The results will shed light for revealing the molecular correlations within the smectic layer and between the smectic layers for the SmC and SmCa phases.
Appears in Collections:	[Graduate Institute & Department of Chemistry] Research Paper

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