检索结果-南通市图书馆

Science China Chemistry 2008年第8期51卷 705-708页

作者： JIM Cathy K w lam jacky w y HAEUSSLER Matthias Department of Chemistry The Hong Kong University of Science & TechnologyClear Water BayKowloonHong KongChina

This paper presents a new synthetic route to hyperbranched polymer. An arylene bipropiolate monomer,dimethylmethylenebis(1,4-phenylene) bipropiolate,was prepared by a one-step esterification reaction of bisphenol A with propiolic acid. Polycyclotrimrtization of the monomer was effected by reflux in dimethylformamide(DMF),producing a soluble hyperbranched poly(aroxycarbonylphenylene) in a good yield. The polymer was perfectly branched with a degree of branching of 100%.

关键词： cyclotrimerization regioselectivity hyperbranched polymer

Restriction of Intramolecular Motion(RIM):Investigating AIE Mechanism from Experimental and Theoretical Studies

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2021年第1期37卷 1-15页

作者： ZHANG Jianyu ZHANG Haoke lam jacky w.y. TANG Ben Zhong Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science&TechnologyClear Water BayKowloonHong KongP.R.China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027P.R.China Center for Aggregation-Induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640P.R.China Guangzhou Development District AIE InstituteGuangzhou510530P.R.China

Mechanistic studies promote scientific development from phenomena to ***-induced emission(AIE),as an unusual photophysical phenomenon,builds the bridge between molecular science and aggregate *** the twenty-year development of AIE,restriction of intramolecular motion(RIM)has been verified as the working mechanism of AIE *** this review,these mechanistic works about RIM are summarized from experimental and theoretical ***,the experimental studies are introduced from three parts:external rigidification,structural modification and structural *** the theoretical part,calculations on the low-frequency motion of AIEgens have been performed to prove the RIM *** virtue of the theoretical calculations,some new mechanisms are proposed to supplement the RIM,such as restriction of access to conical intersection,suppression of Kasha transition,restriction of access to dark state,*** is foreseeable that the RIM mechanism will unify the photophysical theories for both molecules and aggregates,and inspire more progress in aggregate science.

关键词： Aggregation-induced emission(AIE) Restriction of intramolecular motion Photophysical mechanism Aggregate science

Synthesis and properties of poly(1-phenyl-1-octyne)s containing stereogenic and chromophoric pendant groups

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2009年第10期52卷 1691-1702页

作者： lam jacky w.y. JIM Cathy K.w. KwOK Hoi Sing Department of Chemistry The Hong Kong University of Science & Technology Center for Display Research The Hong Kong University of Science & Technology

Poly(1-phenyl-1-octyne)s containing different stereogenic and chromophoric pendants {-[(C6H13)C= C(C6H4-p-CO2-R)] n -R = [(1S)-endo]-(?)-borneyl (P3), (1R,2S,5R)-(?)-menthyl (P4), -C6H4-p-(1R,2S,5R)-(?)-menthyl (P5), 2-napthyl (P6), 4-biphenylyl (P7)} have been designed and synthesized. The polymers are prepared in moderate yields by wCl6-Ph4Sn and possess high molecular weights (M w up to 64000). The structures and properties of the polymers are characterized and evaluated by NMR, TGA, UV, CD, PL, and EL analyses. All the polymers are thermally stable and their temperatures for 5% weight loss locate in the range of 300 to 416°C under nitrogen. The energy band gaps of all the polymers are ～3.0 eV. Polymers P4 and P5 show CD absorptions associated with the helicity of the polymer segments. Excitation of the THF solutions of P3–P7 by UV irradiation gives strong blue lights of ～485 nm with quantum yields higher than 20%. The thin films of the polymers also emit in the same spectral region, indicative of little aggregation-caused quenching of light emission. Multilayer EL devices with a configuration of ITO/Polymer:PVK/BCP/Alq3/LiF/Al are constructed, which emit blue lights of ～487 nm. The maximum luminance and external quantum efficiency vary with the pendant groups, with P6 exhibiting the highest external quantum efficiency of 0.16%. The spectra stability of the EL devices is outstanding and the EL peak maximum experiences little change with the applied voltage.

关键词： chiral photoluminescence polyacetylene electroluminescence helicity

具有不同长度间隔基的含联苯基团的侧链液晶聚炔的荧光行为(英文)

在线全文

学校读者我要写书评

暂无评论

物理化学学报 2010年第8期26卷 2281-2285页

作者：余振强张昕李子臣陈尔强 lam jacky w. y. 唐本忠北京大学化学与分子工程学院高分子科学与工程系高分子化学与物理教育部重点实验室北京分子科学国家实验室北京100871 深圳大学化学与化工学院深圳市功能高分子重点实验室广东深圳518060 香港科技大学化学系香港九龙

对一系列具有不同长度间隔基的含联苯基团的侧链液晶聚炔的稳态荧光和荧光衰减行为进行了研究.为便于比较,选取其中一个单体作为模型化合物.稳态荧光光谱结果表明,聚合物和单体均显示一个荧光发射,该荧光发射来源于聚合物侧链的联苯基团... 详细信息

对一系列具有不同长度间隔基的含联苯基团的侧链液晶聚炔的稳态荧光和荧光衰减行为进行了研究.为便于比较,选取其中一个单体作为模型化合物.稳态荧光光谱结果表明,聚合物和单体均显示一个荧光发射,该荧光发射来源于聚合物侧链的联苯基团.随着间隔基长度的减小,聚合物的荧光强度降低.荧光衰减结果表明单体的荧光衰减可以拟合为一个单指数衰减,而聚合物的荧光衰减拟合为三指数衰减.这种三指数衰减可能由溶液局部高浓度引起的猝灭和侧链联苯基团的旋转受阻所引起.溶剂效应表明,溶剂与联苯基团之间的相互作用随溶剂极性增加而增大.

关键词：稳态荧光单取代聚炔联苯荧光寿命溶剂效应

含二苯炔基元的侧链液晶聚炔的合成、性能及结构

在线全文

学校读者我要写书评

暂无评论

含二苯炔基元的侧链液晶聚炔的合成、性能及结构

2015年全国高分子学术论文报告会

作者：余振强李婷婷李少军 lam jacky w.y. 唐本忠深圳大学化学与化工学院深圳市功能高分子重点实验室香港科技大学深圳研究院香港科技大学化学系

单取代侧链液晶聚炔的本体相结构研究表明,当主链为顺式构型时,分子形成刚性柱状结构,进而堆砌形成柱状液晶相;当主链为反式构型时,较短的间隔基使刚性主链和侧链液晶基元之间耦合形成片状结构,可以堆砌形成分子间排列受挫的高级有序近... 详细信息

单取代侧链液晶聚炔的本体相结构研究表明,当主链为顺式构型时,分子形成刚性柱状结构,进而堆砌形成柱状液晶相;当主链为反式构型时,较短的间隔基使刚性主链和侧链液晶基元之间耦合形成片状结构,可以堆砌形成分子间排列受挫的高级有序近晶相。如果侧链基元为具有发光性能的液晶基元,形成的近晶相结构在取向后将有望发射高偏振度的线偏振光。本文在合成一系列具有不同长度间隔基和不同长度烷基尾链的含二苯炔基元的侧链液晶聚炔的基础上,通过紫外-可见分光光度法、荧光（偏振）光谱、差示扫描量热法（DSC）、变温一维和二维（1D和2D）广角X-射线衍射（wAXD）、偏光显微镜（PLM）等研究手段考察聚合物及其单体的发光行为及相结构,并采用分子动力学方法模拟其液晶相结构。结果表明,二苯炔可以作为液晶基元引入聚炔侧链形成具有发光性能的侧链液晶聚炔,在样品取向后能够产生高偏振度的线偏振光。

关键词：聚炔二苯炔发光偏振

在线全文

cnki会议

学校读者我要写书评

暂无评论

间隔基长度对侧链液晶聚炔相行为的影响

间隔基长度对侧链液晶聚炔相行为的影响

2013年全国高分子学术论文报告会

作者：余振强张哲林杰生朱才镇陈尔强 lam jacky w.y. 唐本忠深圳大学化学与化工学院深圳市功能高分子重点实验室北京大学化学与分子工程学院香港科技大学化学系

＜正＞聚乙炔等具有刚性主链的侧链液晶高分子的相结构与相转变的研究对理解高分子液晶凝聚态结构具有重要意义。单取代侧链液晶聚炔的本体相结构研究表明,当主链为顺式构型时,分子形成刚性柱状结构,进而堆砌形成柱状液晶相;当主链为反... 详细信息

＜正＞聚乙炔等具有刚性主链的侧链液晶高分子的相结构与相转变的研究对理解高分子液晶凝聚态结构具有重要意义。单取代侧链液晶聚炔的本体相结构研究表明,当主链为顺式构型时,分子形成刚性柱状结构,进而堆砌形成柱状液晶相;当主链为反式构型时,较短的间隔基使刚性主链和侧链液晶基元之间耦合形成片状结构,可以堆砌形成分子间排列受挫的高级有序

关键词：聚炔联苯近晶相 X-射线衍射准长程有序

在线全文

cnki会议

学校读者我要写书评

暂无评论

含苯并菲盘状液晶聚炔的相结构

含苯并菲盘状液晶聚炔的相结构

2010年两岸三地高分子液晶态与超分子有序结构学术研讨会（暨第十一次全国高分子液晶态与超分子有序结构学术论文报告会）

作者：余振强朱才镇刘剑洪 lam jacky w.y. 赵可清唐本忠深圳大学化学与化工学院深圳市功能高分子重点实验室香港科技大学化学系四川师范大学化学与材料科学学院

盘状液晶材料在光存储、有机半导体、光电导体、光电池电荷传输材料及液晶显示材料等方面显示出巨大的应用前景。聚乙炔等具有刚性主链的侧链液晶高分子的相结构与相转变的研究对理解高分子液晶凝聚态结构具有重要意义。单取代侧链液晶... 详细信息

盘状液晶材料在光存储、有机半导体、光电导体、光电池电荷传输材料及液晶显示材料等方面显示出巨大的应用前景。聚乙炔等具有刚性主链的侧链液晶高分子的相结构与相转变的研究对理解高分子液晶凝聚态结构具有重要意义。单取代侧链液晶聚炔的本体相行为的研究表明,具有刚性主链的侧链液晶聚炔以整个分子形成

关键词：聚炔盘状液晶相结构 X-射线衍射

侧链含苯并菲盘状液晶基元的侧链液晶聚炔的相行为

在线全文

cnki会议

学校读者我要写书评

暂无评论

侧链含苯并菲盘状液晶基元的侧链液晶聚炔的相行为

2011年全国高分子学术论文报告会

作者：余振强朱才镇刘剑洪 lam jacky w.y. 赵可清唐本忠深圳大学化学与化工学院香港科技大学化学系四川师范大学化学与材料科学学院

＜正＞单取代侧链液晶聚炔的本体相行为的研究表明,当主链为顺式构型时,分子形状为刚性柱状结构,柱状分子通过堆砌可以形成柱状液晶相;当主链为反式构型时,分子形状为片状结构,片状结构之间堆积形成近晶相。本文以侧链含苯并菲盘状液晶... 详细信息

＜正＞单取代侧链液晶聚炔的本体相行为的研究表明,当主链为顺式构型时,分子形状为刚性柱状结构,柱状分子通过堆砌可以形成柱状液晶相;当主链为反式构型时,分子形状为片状结构,片状结构之间堆积形成近晶相。本文以侧链含苯并菲盘状液晶基元的侧

关键词：聚炔盘状液晶相结构 X-射线衍射

具有不同液晶基元的双取代聚炔的相转变与相结构

在线全文

cnki会议

学校读者我要写书评

暂无评论

具有不同液晶基元的双取代聚炔的相转变与相结构

2009年全国高分子学术论文报告会

作者：余振强朱才镇刘剑洪陈尔强 lam jacky w.y. 唐本忠深圳大学化学与化工学院北京大学化学与分子工程香港科技大学化学系

＜正＞单取代侧链液晶聚炔的本体相行为的研究表明,当主链为螺旋的顺式-顺式、顺式-反式构象时将形成刚性棒状结构,进而形成柱状液晶相;当主链为反式-顺式、反式-反式构象时形成片状结构,片状结构之间堆积形成近晶相。即单取代侧链液晶... 详细信息

＜正＞单取代侧链液晶聚炔的本体相行为的研究表明,当主链为螺旋的顺式-顺式、顺式-反式构象时将形成刚性棒状结构,进而形成柱状液晶相;当主链为反式-顺式、反式-反式构象时形成片状结构,片状结构之间堆积形成近晶相。即单取代侧链液晶聚炔是以整个分子形成的棒状

关键词：聚炔液晶高分子相转变相结构

Recent Progress in AIE-active Polymers

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2019年第4期37卷 289-301,I0004页

作者： yu Bing Hu jacky w.y.lam Ben Zhong Tang HKUST-Shenzhen Research Institute Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced StudyThe Hong Kong University of Science and Technology Center for Aggregation-Induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

The demand for highly efficient solid-state luminophores is continuously growing due to their potential applications in optoelectrical devices, chemosensors, and biological applications. The discovery of luminogens with aggregation-induced emission(AIE)by Tang et al. in 2001 provides a good reponse to this demand. Among the exploited AIE luminogens, AIE-active polymers possess many advantages such as simple synthesis, convenient structrue modifications, and good processability, which offer an extensive platform for scientists and engineers. Herein, the design principles and latest synthetic advancement of AIE-active polymers are summarized, including click polymerization and multicomponent polymerization. Non-conjugated heteroatom-rich polymers were in situ generated and demonstated non-conventional clusteroluminoscence. Advanced applications including fluorescent sensors, stimuli-responsive materials,biological applications, circularly polarized luminescence, and electroluminescence are then introduced in detail. AIE-active polymers display the signal-amplification effect for sensitive and selective response to chemo/bioanalytes or stimuli and enhanced photosensitization effect for cancer theranostics. Retrospecting the expansion of this field can further strengthen our belief that AIE-active polymers are promising for conceptual innovation and technological breakthroughs in the near future.

关键词： Aggregation-induced emission Polymer synthesis High-tech application