Photovoltaic Characteristics of a Naphthylamine Derivative

Organic photovoltaic （OPV） cells were fabricated via vacuum vapor deposition with {4-[2-（3-di-cyanomethylidene-5,5-dimethylcyclohexenyl）vinyl]phenyl}di（1-naphthyl）amine （DNP-2CN） as the electron donor, and fullerene （C60） as the electron acceptor. A thin film （10 nm） of tris（8-quinolinolato）aluminum （Alq3） was adopted as the buffer layer. A device based on this DNP-2CN exhibited an open circuit voltage （Voc） of 370 mV, a short-circuit current density （Jsc） of 0.61 mAocm 2, and a white-light power conversion efficiency （ η） of 0.09% （AM1.5, 75 mW.cm^- 2）.     

反应原料组成对单分散苯乙烯微球粒径及其分布的影响

采用分散聚合工艺制备微米级单分散聚苯乙烯微球，并对分散聚合反应的内部影响因素(分散稳定剂、助稳定剂、单体、引发剂)进行了研究．结果表明，随着分散稳定剂和助稳定剂用量的增加，聚苯乙烯微球的粒径减小；随着单体和引发剂用量的增加，聚苯乙烯微球的粒径增大．分散稳定剂和单体用量是影响聚苯乙烯微球粒径分布的两个主要内部因素．     

脂肪族聚碳酸酯(PPC)与聚乳酸(PLA)共混型生物降解材料的热学性能、力学性能和生物降解性研究

通过溶液浇铸法制备了脂肪族聚碳酸酯与聚乳酸的共混物(PPC/PLA).采用示差热分析(DSC)和热重分析(TG)研究了材料的热性能.采用拉伸力学试验研究了共混物的力学性能.通过土壤悬浊拟环境培养降解实验法和扫描电子显微镜分析(SEM)对共混材料的生物降解性能进行了研究.实验结果表明,随着PPC含量的增加,共混物的拉伸强度和杨氏模量降低,而生物降解速率却显著提高.但是,在一定的降解时间内,某些比例共混物的降解速率比100%PPC还要快.综合分析表明,PPC/PLA是力学性能和降解性能可以互补的共混体系.     

Theoretical Study on the Reaction Mechanism of Ketene CH2CO with Isocyanate NCO Radical

The bimolecular single collision reaction potential energy surface of an isocyanate NCO radical with a ketene CH2CO molecule was investigated by means of B3LYP and QCISD（T） methods. The computed results indicate that two possible reaction channels exist on the surface. One is an addition-elimination reaction process, in which the CH2CO molecule is attacked by the nitrogen atom at its methylene carbon atom to lead to the formation of the intermediate OCNCH2CO followed by a C-C rupture channel to the products CH2NCO＋CO. The other is a direct hydrogen abstraction channel from CHzCO by the NCO radical to afford the products HCCO＋HNCO. Because of a higher barrier in the hydrogen abstraction reaction than in the addition-elimination reaction, the direct hydrogen abstraction pathway can only be considered as a secondary reaction channel in the reaction kinetics of NCO＋ CH2CO. The predicted results are in good agreement with previous experimental and theoretical investigations.     

炭气凝胶及其有机气凝胶前驱体的研究进展

介绍了炭气凝胶及其有机气凝胶前驱体的发展概况，着重总结了制备工艺条件(如催化剂及其浓度、反应物总浓度、反应物配比、溶剂、反应温度及时间、超临界干燥工艺条件和炭化工艺条件等)对有机气凝胶及其相应炭气凝胶中孔网络结构的影响，综述了中孔网络结构改性研究的进展．     

季铵盐固相催化使聚氯乙烯脱HCl

通过将季铵盐与聚氯乙烯(PVC)混溶成膜,使其在固相脱HCl,研究了催化剂对PVC脱HCl反应速度和产物结构的影响以及固相反应与温度、时间的关系.发现在催化性能上下基铵盐比乙基铵盐好得多,根据实验结果提出了季铵盐通过分解成叔胺实现催化的机理.     

不同形貌氧化镍纳米材料的合成及其电化学性能

以水-乙二醇为溶剂,以聚乙烯吡咯烷酮(PVP)为表面活性剂,采用溶剂热法合成了NiO纳米片,NiO纳米薄片通过自组装形成花状结构。 改变反应温度和溶剂,制备了NiO纳米立方体颗粒和NiO纳米球形颗粒。 用合成的NiO纳米材料制备工作电极,在6 mol/L的KOH溶液中利用三电极体系进行了电化学性能测试。 在电化学性能测试中进行了循环伏安测试、恒电流充放电测试和电化学阻抗谱(EIS)测试。 结果表明,NiO纳米片的比电容最高(在电流密度为0.5 A/g时比电容值为402 F/g),倍率性能最佳(0.5 A/g增加至4 A/g时有80.1%的电容保持率)。 在电流密度为4 A/g时对NiO纳米片进行1000次恒流充放电循环测试,比电容损失了9.7%。     

Fe（acac）3-Al（i-Bu）3-α，α＇-联吡啶催化丙烯腈与苯乙烯共聚合

研究了Fe（acac）3-Al（i-Bu）3-α，α＇-联吡啶（acac=乙酰丙酮）催化体系催化丙烯腈（AN）与苯乙烯共聚合，用元素分析和核磁共振研究了共聚物的结构，在单体比为1：1时共聚物中丙烯腈／苯乙烯含量分别为49．3％和50．7％．用凝胶渗透色谱研究了聚合物分子量和分子量分布，共聚物分子量分布较窄．动力学研究表明共聚合反应对单体浓度呈一级关系，表观活化能为57．8kJ／mol．     

酶促合成2′,3′-双脱氧双脱氢-5-氟胞嘧啶核苷的研究

从瑞士乳酸杆菌Lactobacillus helveticus(ATCC8018)中提取了N-脱氧核苷转移酶进行催化合成抗病毒药物2′,3′-双脱氧双脱氢-5-氟胞嘧啶核苷(D-D4FC)的反应.考察了反应时间、反应液的pH值、缓冲液以及反应底物浓度对反应产率的影响.     

Study on thermal stability of poled non-linear optical polymers

A logarithmic expression is proposed to describe relaxation of the polar order in side chain polymers,together with a new way of plotting temperature dependent relaxation data.This results in a straight line extending even below the glass transition temperature in the case of poled nonlinear optics (NLO) side chain polymers.A simple procedure to determine the rotational diffusion constant Dr is given and Dr values of several polymer systems have been evaluated and compared with each other.It appears that,starting from the conventional and well known poled polymer system currently applied,a further lowering of Dr by about 3 orders of magnitude is necessary in order to reach an acceptable orientational stability or lifetime of poled polymers for practical applications.Attempts have been made to introduce electron push-pull substituents into high thermostable molecular frameworks and results of preliminary measurements are reported.