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以ITO导电膜为基材,采用热固化法进行实验,制备尺寸为0.6m×1m的聚合物分散液晶膜,讨论了液晶质量分数、热固化温度和升温速率等条件对样品性能的影响,研究发现在液晶质量分数为65%、热固化温度为75℃、升温速率为3.5℃/min的条件下,能够制备出性能优良的聚合物分散液晶膜。 相似文献
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液晶/聚合物复合膜作为成膜材料,其紫外光固化时间对膜的电光性能及微观形貌有很大的影响。文中利用可逆加成-断裂转移自由基聚合(RAFT)制备了活性聚苯乙烯(PS)大分子引发剂,用以引发丙烯酸甲酯(MA)进行活性聚合制备聚合物分散液晶(PDLC)薄膜。系统研究了紫外光固化时间对RAFT-PS基PDLC薄膜电光性能及微观形貌的影响及影响机理。研究表明,通过RAFT法制备的PDLC在较短时间内即完成相分离,并且随着紫外光固化时间的延长,PDLC的阈值电压(Vth)和饱和电压(Vsat)升高,关态透光率(Toff)、记忆效应(ΔT)和最大透光率(Tmax)下降,薄膜的微观形貌也出现了连续明显的变化。随着紫外固化反应时间延长,聚合物基体的相对分子质量显著增加。 相似文献
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本文研究了采用纳米氧化锌棒掺杂的聚合物分散液晶(PDLC)的电阻抗谱特性及其传感应用。利用聚合物分散液晶薄膜具有稳固结构、能抵御机械冲击、容易制备等特点,在材料中掺杂纳米氧化锌棒,通过电阻抗谱性质分析,实现对极性分子如乙醇气体的传感功能。通过对比实验,研究分析了薄膜在遇到乙醇分子时的复阻抗谱的变化,并建立了电化学等效电路,发现该薄膜能有效地实现对乙醇分子的传感功能。并进一步分析研究了该检测传感的灵敏度和响应时间等特性。结果表明,以纳米氧化锌棒掺杂PDLC薄膜有望作为检测乙醇等极性的气体传感器,具有高灵敏度、结构稳定、重复性高、易于制造等优点。 相似文献
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通过采用联苯胺和2,2-二氨基-4,4-双噻唑合成一种含有双噻唑基的共轭聚合物,经过红外、扫描电镜、热重分析等测试了该物质的结构及热稳定性等,并通过将聚合物分散在硅油中制备电流变流体,测试其电流变性能.结果表明共轭聚合物作为电流变体的分散相有利于电流变性能的提高,同时发现随分散相的浓度增大其电流变性能随之提高. 相似文献
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溶剂法制备聚合物分散液晶膜 总被引:5,自引:0,他引:5
用溶剂法制备了聚合物分散液晶膜。采用偏光显微镜、扫描电子显微镜和电光仪对相分离和聚合物分散液晶材料的电光性能作了初步探讨。研究结果表明,升温速度和聚合物含量对PDLC膜的相分离结构和响应电压有显著的影响。 相似文献
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采用对氨基苯磺酸和2,2’-二氨基-4.4’-双噻唑合成一种含有双噻唑基和两性基团的共轭聚合物,通过红外、扫描电镜、热重分析等测试了该物质的结构及热稳定性等,并通过将聚合物分散在硅油和溴代二苯甲烷中制备电流变流体,测试其电流变性能。结果表明,两性聚合物作为电流变体的分散相有利于电流变性能的提高,同时发现分散相和分散介质的密度相接近时也有利于电流变性能的提高。 相似文献
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采用单体4,4′-二[6-(丙烯酰氧基)己氧基]联苯(BAB6)和胆甾相液晶混合光固化,制得聚合物网络稳定液晶(PSLC)薄膜。利用紫外可见分光光度计、响应时间测试装置和扫描电子显微镜(SEM),研究了单体BAB6和手性剂质量分数对PSLC薄膜电光性能和网络微观形貌的影响。结果表明,随着BAB6质量分数增加,PSLC薄膜的聚合物网眼尺寸变小,透过率降低,饱和电压增加,响应时间缩短;随着手性剂质量分数增加,聚合物网眼尺寸缩小,液晶畴变小,驱动电压增加,响应时间进一步下降。当液晶∶单体∶手性剂的质量比为100∶5∶10时,制得了电光性能优良,响应时间为2ms的PSLC薄膜。 相似文献
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采用Langmuir-Blodgett(LB)膜静电诱导沉积法制备聚3,4-乙烯二氧噻吩(PEDOT)高度有序导电聚合物复合薄膜,研究了薄膜的导电性能并进一步研究薄膜在改善器件性能方面的作用.并将其应用于有机电致发光二极管(OLED)器件的空穴缓冲层,将聚3,4-乙烯二氧噻吩/聚苯乙烯磺酸(PEDOT/PSS)复合LB沉积于纳米铟锡金属氧化物(ITO)电极上,制备了以复合LB膜为空穴缓冲层的OLED器件.发现复合LB膜改善了器件性能(启动电压降低,最大亮度增加),但进一步的研究表明LB膜器件在一定时间后出现性能劣化.I-V特性和X射线反射率(XRR)分析表明,薄膜的结构发生一定程度的改变是导致器件性能变差的可能原因. 相似文献
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Mohsin Hassan Saeed Shuaifeng Zhang Le Zhou Gang Chen Meng Wang Lanying Zhang 《Journal of Modern Optics》2020,67(8):682-691
ABSTRACTThis contribution investigates the preparation of polymer-dispersed liquid crystal (PDLC) films based on meth(acrylate) monomers containing rigid structures. The current study specifically focuses on comparison of the monomers on the basis of meth(acrylate) side group, flexible/rigid structures and rigidity. We find that methacrylate monomers exhibit more preferable electro-optic properties than that of the acrylate monomers. Furthermore, through the systematic variation of rigidity, composition of the monomers and chain length of crosslinking agents, both the morphologies and electro-optic properties of these films are found to be adjustable. A composite film is demonstrated by employing moderately rigid monomer (tetrahydrofurfuryl methacrylate) with low driving voltage (21.0?V) and high contrast ratio (87.5). Therefore, the studies here provide a new approach to optimize the electro-optical properties of the PDLC films by introducing monomers with rigid structures. 相似文献
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针对聚合物分散液晶(PDLC)二元体系进行了研究,主要包括外加直流电场下制备的PDLC的相图研究以及PDLC形成过程中相分离情况。在PDLC制备过程中由于外加直流电场对小分子液晶的作用,使液晶在此二元结构中的清亮点发生变化。结果表明,直流电场的引入导致PDLC中液晶清亮点升高。相分离行为主要是跟踪PDLC形成过程中由于小分子液晶与高分子链段之间的排斥作用而引起的相分离,研究了不同条件下PDLC相分离的快慢。 相似文献
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Fabrication of flexible polymer dispersed liquid crystal films using conducting polymer thin films as the driving electrodes 总被引:1,自引:0,他引:1
Conducting polymers exhibit good mechanical and interfacial compatibility with plastic substrates. We prepared an optimized coating formulation based on poly(3,4-ethylenedioxythiophene) (PEDOT) and 3-(trimethoxysilyl)propyl acrylate and fabricated a transparent electrode on poly(ethylene terephthalate) (PET) substrate. The surface resistances and transmittance of the prepared thin films were 500-600 Ω/□ and 87% at 500 nm, respectively. To evaluate the performance of the conducting polymer electrode, we fabricated a five-layer flexible polymer-dispersed liquid crystal (PDLC) device as a PET-PEDOT-PDLC-PEDOT-PET flexible film. The prepared PDLC device exhibited a low driving voltage (15 VAC), high contrast ratio (60:1), and high transmittance in the ON state (60%), characteristics that are comparable with those of conventional PDLC film based on indium tin oxide electrodes. The fabrication of conducting polymer thin films as the driving electrodes in this study showed that such films can be used as a substitute for an indium tin oxide electrode, which further enhances the flexibility of PDLC film. 相似文献
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Ultrasmall light modulators have been made by sandwiching a polymer-dispersed liquid crystal (PDLC) between two ferrules with optical fibers. The device can modulate light independent of the state of polarization, because the PDLC becomes transparent or opaque when either sufficient or no voltage is applied to the film. The PDLC was prepared by mixing and annealing a prepolymer and nematic liquid crystal with large anisotropy. An optical fiber modulator with a 30-mum thick PDLC film had an extinction ratio of 8:1-33:1, an insertion loss of 1.3 dB, and rise and decay times of 4 ms at a wavelength of 1.3 mum. 相似文献
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以甲苯-2,4-二异氰酸酯(TDI)、聚碳酸酯二醇(PCDL)、二羟甲基丙酸(DMPA)和聚醚胺(ATA)为原料,采用A2+B3法合成了具有高度支化结构的水性聚氨酯(HBAPU)乳液。用红外光谱(FT-IR)对产物结构进行表征;用光子相关光谱(PCS)研究了乳液的稳定性能,NCO/OH=1.3,w(DMPA)=6%时可以得到稳定的HBAPU乳液;采用旋转黏度计、差式扫描量热仪(DSC)、热失重分析仪(TG)、电子拉力机对产物的流变行为和各种性能进行了测试。结果表明,相对于线性水性聚氨酯(LAPU),HBAPU产物具有较低的黏度、良好的热稳定性、较高的Tg和拉伸强度。 相似文献
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液晶性能对聚氨酯/液晶复合膜抗凝血性能的影响 总被引:5,自引:0,他引:5
合成了3种亲水性胆甾醇液晶化合物,HO-[CH2CH2]-nO-C∧‖O-O-Chol(n=2,3,4),用元素分析法、红外光谱、差热分析以及偏光显微镜观察对其结构进行了表征,利用聚氨酯与上述液晶化合物制备复合膜,研究了液晶性能对聚合物/液晶复合膜抗凝血性能的影响,结果表明,胆甾醇液晶化合物有利于改善聚合物材料的抗凝血性能。 相似文献
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Ying Li Changdan Gong Chenggong Li Kunpeng Ruan Chao Liu Huan Liu Junwei Gu 《材料科学技术学报》2021,82(23):250-256
Polymer-dispersed liquid crystal(PDLC)films comprising polyvinyl alcohol(PVA)and liquid crystal monomer(LCM)were successfully obtained by the method of solution casting&thermal compress-ing.LCM was distributed orderly in PVA matrix by hydrogen bond interaction,to form PVA-LCM interpenetrating-layered networks.When the mass fraction of LCM was up to 35 wt%,the corresponding in-plane thermal conductivity coefficient(λ∥)of PDLC film was significantly increased to 1.41 W m-1 K-1,about 10.8 times that of neat PVA(0.13 W m-1 K-1).High intrinsic λ//values of PDLC films were mainly attributed to the formed microscopic-ordered structures from ordered stacking of LCM,ordered arrangement of PVA chains,and their hydrogen bond interaction.This work would offer a new way to design and prepare novel intrinsic high thermal conductive polymers. 相似文献
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Takizawa K Fujii T Kawakita M Kikuchi H Fujikake H Yokozawa M Murata A Kishi K 《Applied optics》1997,36(23):5732-5747
Spatial light modulators (SLM's) consisting of a polymer-dispersed liquid crystal (PDLC) film and a Bi(12)SiO(20) photoconductor are discussed and demonstrated. This device, which uses light scattering in the PDLC film, has several advantages including no polarizer, a low optical loss, and video-rate operation. The device was designed by use of an electrical-image method. High-definition SLM's with a limiting resolution (36-50 line pairs/mm) were fabricated by stacking of an optimized mirror and the PDLC film. The device, which was incorporated into a Schlieren system with a 1-kW xenon lamp, provided high-contrast video images and a total luminous flux of 1000 lm. 相似文献
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In the reported work the block copolymers are used in the polymer disperse liquid crystal (PDLC) films. The present work has been performed to investigate the effect of block copolymer addition and block ratios on the PDLC characteristics. From our experimental finding, addition of block copolymer in PDLC shows variation in droplet size, electro-optical properties, extent of phase separation, and phase transition temperature. These finding indicate the alteration in solubility parameters of solutions with the addition of block copolymers. Moreover, the tri-block copolymer shows enlarge droplet size, enhancement in the degree of phase separation, and predict improvement in electro-optical properties, as compared to di-block copolymer. Similarly upon such comparison, the study suggests the tri-block copolymer have a relative lower molecular interaction with the liquid crystal molecules. 相似文献