指導老師 : 謝慶東 博士 研究生 : 劉堯欽 報告日期 :98 年 11 月 25 日
DESCRIPTION
指導老師 : 謝慶東 博士 研究生 : 劉堯欽 報告日期 :98 年 11 月 25 日. 前言 :. ◎ 向列型液晶顯示技術 液晶顯示器中的基本型。 將入射光旋轉 90 度。 只有亮暗兩種型態。 ◎ 扭轉向列效應( TN effect ) TN 液晶盒中,在上下兩塊玻璃之間沒有施加電壓時,液晶的排列方向會依照上下兩塊玻璃上的配向膜而定。而上下配向膜的角度差恰為 90 度,所以液晶分子的排列會由上而下自動旋轉 90 度. 前言 :. 摩擦配向 :. 光配向 :. 利用照射 UV 光使光反應材料產生反應誘導液晶排列. - PowerPoint PPT PresentationTRANSCRIPT
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TN effect TN9090
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:::UVLPUVLGlanTalor 300 nm(3005 nm)LC cell
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: 1.UV
2.LC
3.
4.LBL
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Poly(4-vinylpyridine) (PVPy, Mw560,000)
poly(ethyleneimine) (PEI, Mw550,000)
4-hydroxycinnamic acid (purchased from Aldrich)
poly(4-acryloyloxy)cinnamic acid (PCA)
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Experimental details1.Synthesis
2. Film preparation
3. Instrumentation and measurement
4. Cell fabrication
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SynthesisStep(1) :4-Acryloyloxycinnamic acid preparationPCA (13.12 g, 80 mmol)+NaOH (6.4 g,160 mmol) (40mL) (40mL)
4h
(5~10 9.8mL120mml)
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HCl 4-acryloyloxycinnamc acidl(THF)18665%4-Acryloyloxycinnamic acid
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Step(2) : Poly(4-acryloyloxy)cinnamic acid (PCA) preparation(20mL)Poly(4-acryloyloxy)cinnamic acid (1g) + AIBN(0.01g)65 12H
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50%Poly(4-acryloyloxy)cinnamic acid (PCA)
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Synthesis PCA preparation
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Film preparation:CaF2NH2PVPy10THFPCA10
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Film preparation:LBLPVPy()PCA()
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Instrumentation and measurement:1. 300W HgXe LPUVL2.300nm3.GlanTalor 4.LPUVL5.Shimadzu UV-3101PC6.
LPUVLGlanTalor 0.3mWcm-2300 nm(3005 nm)LC cell
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Cell fabrication:LPUV
Spacer(20m)TEB30A (TNI = 61 )71GlanTalor LC cell
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Results and discussion
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3.1 LBL multilayer film formation274nm257nmPVPy- *300nmPCA- *Figure 4. UVvisible absorption spectra of PVPy/PCA film on a quartz substrate with increasing number of bilayers. The inset diagram shows the increase of absorption at 274nm with the number of bilayers.
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3.2 Photoreaction in the films(LPUV)300nmPCA10%[2+2]LBLLPUVLPUV
PVPy257nmPVPy
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LPUV(A //)(A )LC
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DRDR DRDR
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3.3 Driving force for PVPy/PCA multilayer fabricationO-H
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3.4 Photoalignment properties of the LBL multilayer film(a) (b) 45 45 LC cellLC cell
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(Tmax/Tmin)20 LC
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Conclusion:PCAPVPyLPUVLPUV