检索结果-南通市图书馆

Computer simulation studies of the influence of side alkyl chain on glass transition behavior of carbazole trimer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2017年第3期60卷 377-384页

作者： Chunyang Yu Li Ma Wei Huang Yongfeng Zhou jingui qin Deyue Yan State Key Laboratory of Metal Matrix Composites School of Chemistry & Chemical EngineeringShanghai Jiao Tong University Department of Chemistry Wuhan University

In this work,all-atom molecular dynamics simulations were employed to study the influence of the side alkyl chain on glass transition behavior of several carbazole trimers(CT) in a temperature range from 423 to 183 *** glass transition temperatures were obtained from the break in the slope of the volume-temperature curves and found to agree with the experimental *** short time dynamics of four CT molecules were probed by usingvelocity autocorrelation functions and mean-square *** current studies showed that the dynamics of CT systems can be easily interpreted through the cage ***,the investigation of the torsional autocorrelation function and P_(2-state)/P_(3-state) functions showed that the rotational barriers of side chains can slow down the conformational relaxation and lead to stronger temperature dependence of conformational *** relaxation time,characteristic time of P_(2-state)(t) and P_(3-state)(t) functions were all found to have Arrhenius-type temperature dependence.

关键词： carbazole trimer molecular dynamics simulation glass transition relaxation time

Research progress on mid-IR nonlinear optical crystals with high laser damage threshold in China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemistry in China 2011年第1期6卷 1-8页

作者： Tianxiang ZHU Xingguo CHEN jingui qin Department of Chemistry and Hubei Key Laboratory on Organic and Polymeric Opto-electronic Materials Wuhan UniversityWuhan 430072China

Nonlinear optical(NLO)crystals have been playing an increasingly important role in laser science and *** NLO crystals used in the middle infrared(mid-IR)region,compared with the NLO crystals in the other wavelength regions,are still not good enough for the application of high-energy *** main defect is that their laser damage thresholds(LDT)are *** scientists have made a lot of important contributions to the UV and visible NLO *** the last decade,they also did a lot of work on the mid-IR NLO *** main purpose of these researches is to increase the LDT and simultaneously balance the other *** paper presents a brief summary of their research progress in this topic on three types of materials:chalcogenides,oxides,and *** emphasis is put on the design strategy and quality control of the crystals.

关键词： nonlinear optical(NLO)crystals laser damage threshold(LDT) mid-IR region design crystal growth

A structurally ordered thiophene-thiazole copolymer for organic thin-film transistors

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 2012年第5期55卷 760-765页

作者： CHEN DuGang ZHAO Yan ZHONG Cheng YU Gui LIU YunQi qin jingui Department of Chemistry and Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan UniversityWuhan 430072China Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China

This paper reports a new donor-acceptor copolymer semiconductor, PTBTh, comprising bithiophene and bithiazole where the regular coplanar structure and the intramolecular charge transfer are expected to increase the opportunity for --- stacking and charge transport. The AFM image shows lamellar stacking of the polymer on the surface. The field-effect transistor (FET) properties of PTBTh have been evaluated by a bottom-contact/bottom-gate TFT configuration. The device showed a high hole mobility of 1.14×10-2 cm2 V-1 s-1 and a current on/off ratio of 3×105 with the polymer thin film annealed at a mild temperature of 120 ℃ when measured under ambient conditions.

关键词： thin-film transistors copolymer mobility atomic force microscopy

Design, synthesis and nonlinear optical properties of “dendronized hyperbranched polymers”

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第22期58卷 2753-2761页

作者： WU WenBo HUANG LiJin FU YingJie YE Cheng qin jingui LI Zhen Department of Chemistry Wuhan University Institute of Chemistry Chinese Academy of Sciences

A new type of dendritic polymer, named dendronized hyperbranched polymer (DHP), was prepared successfully by the macro-monomer approach. Thanks to the perfect 3D isolation effects, DHPG1 exhibited good NLO property with d 33 value of 133 pm/V, higher than its analogues of dendronized polymer and dendrimer, and its stability of NLO effect was also enhanced.

关键词：树枝状聚合物非线性光学性质超支化聚合物柱状非线性光学效应设计合成 DHP

Two-photon absorption in V-type chromophores with electron-rich heterocyclevinylene bridges

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2011年第4期54卷 625-630页

作者： LI QianQian ZHONG AoShu LIU HaiJie PENG Ming LIU Jun PEI ZhiGuo HUANG ZhenLi qin jingui LI Zhen Department of Chemistry Hubei Key Laboratory on Organic and Polymeric Opto-Electronic MaterialsWuhan UniversityWuhan 430072China Key Laboratory of Biomedical Photonics of Ministry of Education Huazhong University of Science and Technology Wuhan 430074China

A series of V-type chromophores with electron-rich heterocyclevinylene bridges have been synthesized via Wittig-Horner-Emmons and Vilsmeier *** the target chromophores showed strong one-photon and two-photon excited emission,and their electron properties could be tuned by using different heterocycles such as furan,thiophene and pyrrole moieties in *** maximum two-photon absorption (TPA) cross sections occurred at 760 nm and were measured to be in the range of 400-800 GM.

关键词： two-photon absorption electron-rich heterocycle chromophore

一种连有C_(60)功能基团的聚磷腈的合成

在线全文

学校读者我要写书评

暂无评论

化学学报 2003年第8期61卷 1335-1337页

作者：李振秦金贵武汉大学化学与分子科学学院武汉430072

采用一种后功能化的方法合成了一种连有C60 侧基的聚磷腈高分子 ,即首先合成了连有苄溴基团的聚磷腈 ,然后将苄溴基团转换为叠氮基团 ,再合成连有C60 侧基的聚磷腈高分子 .通过核磁、红外、紫外可见光谱、分子量测定等手段对所得高分子... 详细信息

采用一种后功能化的方法合成了一种连有C60 侧基的聚磷腈高分子 ,即首先合成了连有苄溴基团的聚磷腈 ,然后将苄溴基团转换为叠氮基团 ,再合成连有C60 侧基的聚磷腈高分子 .通过核磁、红外、紫外可见光谱、分子量测定等手段对所得高分子进行了鉴定 .

关键词： C60 功能基团聚磷腈合成功能材料高分子结构表征叠氮基团

Synthesis and photovoltaic property of pyrrole-based conjugated oligomer as organic dye for dye-sensitized solar cells

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2011年第1期4卷 87-92页

作者： Qianqian LI Wenjun WU Aoshu ZHONG Jianli HUA Ming PENG Jing HUANG Jie SHI He TIAN jingui qin Zhen LI Department of Chemistry Wuhan University Key Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science & Technology

A new pyrrole-based conjugated oligomer（P1）was obtained with phenyl-linked triphenylamine moieties as an isolation group. Little aggregations were observed whether oligomer P1 was absorbed on titanium dioxide（TiO2） surface or in solid state. Since the pyrrole-based moieties in donor-π-acceptor type was the core component of oligomer P1 for light absorption, the corresponding dyesensitized solar cell（DSSC） demonstrated the efficiency of light-to-electrical conversion by 0.48%. Higher conversion efficiency could be achieved by tuning the size of the isolation groups and the structure of the donor-π-acceptor type dyes.

关键词： pyrrole synthesis dye sensitizer oligomer