CAJ | 학술논문

采用差示扫描量热(DSC)、一维(1D)广角x射线衍射(WAXD)、热台偏光显微镜(PLM-hot stage)等研究手段对含联苯液晶基元的侧链液晶聚炔单体5-{[(4'-正戊基氧-4-联苯基基)羰基]氧}-1-戊炔(A3EO5)的本体相转变和相结构进行了研究.DSC和1D-WAXD实验结果表明,A3EO5在升温和降温过程中均呈现四个相转变过程,形成双向性液晶.样品从各向同性态降温至室温过程中,首先形成近晶A相,随后进入层内排列具有准长程有序的近晶B相,继续降温将形成层内为正交排列的近晶E相,在此之后样品进入晶相.PLM结果指出样品在各向同性态降温过程中分别形成球状织构、角锥织构和同心圆弧织构.
채용차시소묘량열(DSC)、일유(1D)엄각x사선연사(WAXD)、열태편광현미경(PLM-hot stage)등연구수 단대함련분액정기원적측련액정취결단체5-{[(4'-정무기양-4-련분기기)탄기]양}-1-무결(A3EO5)적본체상전변화상결구진행료연구.DSC화1D-WAXD실험결과표명,A3EO5재승온화강온과정중균정현사개상전변과정,형성쌍향성액정.양품종각향동성태강온지실온과정중,수선형성근정A상,수후진입층내배렬구유준장정유서적근정B상,계속강온장형성층내위정교배렬적근정E상,재차지후양품진입정상.PLM결과지출양품재각향동성태강온과정중분별형성구상직구、각추직구화동심원호직구.
Phase transitions and structures of the monomer of side-chain liquid crystalline polyacetylene containing biphenyl mesogen,namely,5-{[(4'-pentyloxy-4-biphenylyl)carbonyl]oxy}-1-penyne(A3EO5)were investigated by differential scanning calorimetry(DSC),one dimensional(1D)wide angle X-ray diffraction (WAXD),and polarized light microscopy equipped with hot-stage (PLM-hot stage).DSC and 1D-WAXD results show that A3EO5 forms an enantiotropic liquid crystal and displays four transitions during the cooling and subsequent heating processes.Upon cooling from isotropic phase to room temperature,the sample forms smectic A phase and then leads to smectic B phase with pseudo long-range orientation within the layer structure,further lowering the temperature,A3EO5 forms smectic E phase with orthorhombic packing within the smectic layer and enters crystal phase.PLM results show that the sample forms spherulitic texture,focal conic texture and concentric arcs texture during the cooling process.