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Linear and crosslinked silicon based liquid crystalline materials 线性和交联硅基液晶材料
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581208
T. Ganicz
{"title":"Linear and crosslinked silicon based liquid crystalline materials","authors":"T. Ganicz","doi":"10.1117/12.581208","DOIUrl":"https://doi.org/10.1117/12.581208","url":null,"abstract":"In this paper the effect of steric hindrance, crosslinking and the use of multipode mesogenic moieties is presented as a part of studies directed on the architectural modification of silicon containing SLCP's. Trist(trimethylsilyl)methyl(trisyl) groups have been attached to liquid crystalline comb-like polysiloxanes by hydrosilylation reaction in order to increase their thermal stability. It was found that attaching trisyl group to 10% of monomeric units led to a decrease in mass loss at 330°C by a factor of 2. The thermo-optical studies of linear and crosslinked LC polycarbosilanes exhibiting SmC* phase proved that crosslinking stabilizes the generated mesophases, especially during isotropisation process. The new synthetic route for polysiloxanes with pendant \"triple-fork\" mesogenes has been developed. It was found that such the structures are able to generate stable mesophases even if their molecular mass is relatively low.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124230527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of rigid core structure on layer tilt and mesomorphic properties in homologous series of three ring antiferroelectric esters 刚性核结构对三环反铁电酯类同系物层倾斜和介晶性质的影响
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581065
J. Gąsowska, J. Dziaduszek, W. J. Drzewinski, M. Filipowicz, R. Dabrowski, J. Przedmojski, K. Kenig
{"title":"Influence of rigid core structure on layer tilt and mesomorphic properties in homologous series of three ring antiferroelectric esters","authors":"J. Gąsowska, J. Dziaduszek, W. J. Drzewinski, M. Filipowicz, R. Dabrowski, J. Przedmojski, K. Kenig","doi":"10.1117/12.581065","DOIUrl":"https://doi.org/10.1117/12.581065","url":null,"abstract":"Mesomorphic properties (phase transitions enthalpies and temperatures) and the dependence of smectic layer spacings upon reduced temperature for eight homologous series of three ring ester such as: (S)-(+)-4-(1-methylheptyloxycarbonyl)phenyl or (S)-(+)-4-(1-methylheptyloxycarbonyl)-3-fluorophenyl or (S)-(+)-4-(1-methyl-heptyloxycarbonyl)-2-fluorophenyl 4'-(perfluoroalkanoyloxyhexyloxy)biphenylates and 4'-(alkanoyloxyhexyloxy)-biphenylates, and (S)-(+)-4-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4'-(perfluoroalkanoyloxyhexyloxy)benzoates and 4'-(alkanoyloxyhexyloxy)benzoates were described. The terminal chain fluorinated compounds have SmC*anti-SmC*-SmA-Iso phase sequence and a high tilted (orthoconic) antiferroelectric phase in broad temperature range.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116949216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Study of different modes of dielectric relaxations in antiferroelectric liquid crystal MOPB(H)PBC 反铁电液晶MOPB(H)PBC中不同模式介电弛豫的研究
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581057
A. K. Srivastava, R. Dhar, V. Agrawal, R. Dabrowski
{"title":"Study of different modes of dielectric relaxations in antiferroelectric liquid crystal MOPB(H)PBC","authors":"A. K. Srivastava, R. Dhar, V. Agrawal, R. Dabrowski","doi":"10.1117/12.581057","DOIUrl":"https://doi.org/10.1117/12.581057","url":null,"abstract":"Dielectric spectroscopy of the ferro- and antiferro-electric phases of an antiferroelectric liquid crystal namely [4,4-(1-methyloctyloxycarbonyl)phenyl]-4'-[3-(butanoiloxy)prop-1-oxy]biphenyl carboxylate (MOPB(H)PBC) has been carried out in the frequency range of 1 Hz to 10 MHz. Typical behavior of soft mode relaxation in SmA* has been observed. Two-dielectric relaxation modes: FM1 (Ferroelectric mode 1) and FM2 (Ferroelectric mode 2) have been recognized in SmC* phase. The relaxation frequencies for FM1 lie between 2 and 25 Hz and those for FM2 lie around 3.5 kHz (Goldstone mode). Also two dielectric relaxation modes AFM1 (Antiferroelectric mode 1) and AFM2 (Antiferroelectric mode 2) have been observed in antiferroelectric SmCA* phase. AFM1 lies between 3 and 10 kHz and its relaxation frequency decreases with decrease in temperature. AFM2 lies above 400 kHz but the temperature dependence of its realization frequency is opposite to that of AFM1.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"5565 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128854354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Possibilities of application of polymer-dispersed liquid crystals in information displays 聚合物分散液晶在信息显示中应用的可能性
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581129
M. Aleksander, S. Kłosowicz
{"title":"Possibilities of application of polymer-dispersed liquid crystals in information displays","authors":"M. Aleksander, S. Kłosowicz","doi":"10.1117/12.581129","DOIUrl":"https://doi.org/10.1117/12.581129","url":null,"abstract":"The prospects of application of polymer-dispersed liquid crystals in information displays are discussed. The brief information regarding methods of preparation of such composites is given. The main electro-optical effects observed in different LC dispersed phases and the effect of PDLC morphology on their electro-optical properties are presented. The advantages and disadvantages of PDLC as materials for construction of different kinds of displays are discussed and the promising applications are shown.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130390420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Mesomorphic properties and structure of compounds on isophtalic acid base 异苯二甲酸基化合物的介形性质和结构
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581075
Nadiya S. Novikova, E. D. Kilimenchuk, A. S. Tolochko, V. D. Panikarskaya
{"title":"Mesomorphic properties and structure of compounds on isophtalic acid base","authors":"Nadiya S. Novikova, E. D. Kilimenchuk, A. S. Tolochko, V. D. Panikarskaya","doi":"10.1117/12.581075","DOIUrl":"https://doi.org/10.1117/12.581075","url":null,"abstract":"Our investigation purpose is the determination of the molecular structure peculiarity of banana-shaped compounds, which promotes the formation \"banana\" phase or prevents from it. The homologous series of the 4-methoxy-1,3-benzene-dicarbonic acid esters have been synthesized and their mesogenic properties have been studied. On the basis of the polarization microscope it is shown that compounds containing 5,6 or 12 carbon atoms in the lateral alkyl chain are non-mesomorphic. But compounds with 7 - 9 carbonic atoms in the lateral alkyl chain form smectic phase. On the base of differential scanning calorimeter measurement and X-ray diffraction investigation this phase may be preliminary attributed to \"banana\"-smectic phase, we kind of which we have not identified.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130474485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Liquid crystals under compression and tension 压缩和拉伸下的液晶
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581086
V. Manjuladevi, N. V. Madhusudana
{"title":"Liquid crystals under compression and tension","authors":"V. Manjuladevi, N. V. Madhusudana","doi":"10.1117/12.581086","DOIUrl":"https://doi.org/10.1117/12.581086","url":null,"abstract":"We report measurements of the temperature dependences of the birefringence of a number of nematogens under high pressures. In a compound whose molecules have large longitudinal dipole moments, we detect a nematic to nematic transition when the order parameter is sufficiently high. We also describe a technique of subjecting aligned liquid crystal droplets to large negative pressures and measuring the temperature dependence of birefringence under isochoric conditions. The temperature range of the partial bilayer smectic Ad phase gets shrunk at elevated pressures but gets enlarged under tension.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133573954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Liquid crystalline cyclic oligosiloxanes containing long alkyl substituents as an end group 以长烷基取代基为端基的液晶环状低聚硅氧烷
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581067
E. Białecka-Florjańczyk, E. Kowalczyk, J. Sołtysiak, J. Przedmojski
{"title":"Liquid crystalline cyclic oligosiloxanes containing long alkyl substituents as an end group","authors":"E. Białecka-Florjańczyk, E. Kowalczyk, J. Sołtysiak, J. Przedmojski","doi":"10.1117/12.581067","DOIUrl":"https://doi.org/10.1117/12.581067","url":null,"abstract":"A series of new liquid crystalline cyclic siloxane oligomers was prepared to investigate the influence of the long alkyl chain as an end substituent on their mesomorphic behaviour. Liquid crystalline properties of the new cyclosiloxanes were examined by DSC, polarized optical microscopy and X-ray diffraction methods.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125153398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Dynamic photorefractivity in nematic liquid crystal panels with photoconducting polymeric layers 具有光导聚合物层的向列液晶面板的动态光折射率
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581130
A. Agashkov, A. Kovalev, J. Parka
{"title":"Dynamic photorefractivity in nematic liquid crystal panels with photoconducting polymeric layers","authors":"A. Agashkov, A. Kovalev, J. Parka","doi":"10.1117/12.581130","DOIUrl":"https://doi.org/10.1117/12.581130","url":null,"abstract":"A novel mechanism of photorefractivity in nematic LC cells is presented. Dynamic photorefractivity is based on temporal quasiperiodic modules excitation in the liquid crystal layer by applied external alternating electric field, and their reorientation due to charges induced by interference optical field on a surface of photoconducting orienting layer.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121997665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Synthesis and mesomorphic properties fluoro- and chloro-substituted isothiocyanatotolanes 氟代和氯代异硫氰酸托烷的合成及其介形性质
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581064
A. Spadlo, W. Drzewiński, R. Dabrowski, M. Filipowicz, Z. Stolarz, E. Ścibior, J. Kędzierski, S. Urban, S. Gauza, Shin‐Tson Wu
{"title":"Synthesis and mesomorphic properties fluoro- and chloro-substituted isothiocyanatotolanes","authors":"A. Spadlo, W. Drzewiński, R. Dabrowski, M. Filipowicz, Z. Stolarz, E. Ścibior, J. Kędzierski, S. Urban, S. Gauza, Shin‐Tson Wu","doi":"10.1117/12.581064","DOIUrl":"https://doi.org/10.1117/12.581064","url":null,"abstract":"We report the synthesis procedures, phase transition temperatures, optical and dielectric properties of the fluoro and chloro -- substituted two rings and three rings isothiocyanatotolanes. Three eutectic mixtures comprising of these isothiocyanatotolane compounds showing a wide nematic range, low viscosity and high birefringence (~0.4) are formulated.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122292289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Dielectric properties of subphases SmC*α and SmC*γ in an antiferroelectric liquid crystal 反铁电液晶中SmC*α和SmC*γ亚相的介电性质
Liquid crystals (Print) Pub Date : 2004-09-01 DOI: 10.1117/12.581084
M. Wojciechowski, A. Gromiec
{"title":"Dielectric properties of subphases SmC*α and SmC*γ in an antiferroelectric liquid crystal","authors":"M. Wojciechowski, A. Gromiec","doi":"10.1117/12.581084","DOIUrl":"https://doi.org/10.1117/12.581084","url":null,"abstract":"Recently synthesized in Institute of Chemistry, Military University of Technology (Warsaw), antiferroelectric liquid crystal compound (MHPOPOPC) has been studied by means of low frequency dielectric spectroscopy. This compound shows very broad temperature range of ferrielectric subphases: the SmC*α, the SmC*β, and the SmC*γ in cooling process. The dielectric characteristic of these subphases are presented. In the SmC*α phase only soft mode was observed which suggest the antiferroelectric nature of this subphase in the investigated compound. In the SmC*β, phase relaxation process of characteristic antiferroelectric ordering was observed. In the SmC*γ ferrielectric Goldstone mode was registered. The temperature dependence of parameter of these modes were presented.","PeriodicalId":132866,"journal":{"name":"Liquid crystals (Print)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129784608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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