Study on the two class glass transition and ion transport of a comb polymer electrolyte

The thermal behaviour and ion-transport properties of a comb polymer electrolyte CP350/LiSCN based on methyl vinyl ether/maleic anhydride copolymer with oligo-oxyethylene side chains were studied by means of DSC and ac impedance method. The two glass transition temperatures which can be attributed to side chains and main chains respectively were found to increase with increasing salt concentration. Conductivities which displayed non-Arrhenius behaviour were analyzed by using Vogel-Tammann-Fulcher equation and interpreted on the basis of the configurational entropy model derived by Gibbs and coworkers. The optimum ionic conductivity at 25 degrees C achieved was 2.19x10(-5)S/cm.

Pd(OAc)_2/FePc催化环己烯氧化合成环己酮的研究

考察了几种Ｆｅ大环配合物与Ｐｄ（ＯＡｃ）２组成的双组分催化体系，在乙腈酸性水溶液中环己烯氧化合成环己酮的催化活性．实验结果表明，其中以酞菁铁（ＦｅＰｃ）与Ｐｄ（ＯＡｃ）２组成的催化体系活性最高，而ＦｅＴＰＰＣｌ与Ｐｄ（ＯＡｃ）２催化体系，虽然催化活性较高，但催化剂的稳定性较低．各种因素对Ｐｄ（ＯＡｃ）２／ＦｅＰｃ催化活性影响的研究结果指出，在无水和酸存在的非水溶液中，Ｐｄ（ＯＡｃ）２／ＦｅＰｃ对环己烯氧化未显现出任何催化活性．认为在乙腈酸性水溶液中，Ｐｄ（ＯＡｃ）２／ＦｅＰｃ催化环己烯氧化合成环己酮的作用机理与Ｗａｃｋｅｒ催化剂的作用机理相似，ＦｅＰｃ是起再生作用的催化剂.

梳状高分子固体电解质的二级玻璃化转变及离子传输研究

研究了交替马来酸酐共聚物多缩乙二醇酯(CP350)-LiSCN配合物的热行为及离子传输特性.实验表明:CP350/LiSCN配合物在所研究[Li]/[EO]配比范围呈均相无定形并具有二级玻璃化转变.两种玻璃化转变温度均随盐含量的增加而上升.离子电导率随盐浓度的变化而出现一极大值,室温电导率最大可达2.19×10~(-5)S/cm.导电行为符合VTF方程.

钒元素在铬铝丙烷氧化脱氢催化剂中的助催化作用

研究了丙烷在以钒元素为助剂的ＣｒＡｌＯ催化剂上的氧化脱氢反应性能。利用ＸＲＤ、ＤＲＳ、ＸＰＳ等方法，讨论了钒元素的助催化作用。实验结果表明，钒元素的添加，使得催化剂表面产生Ｏ物种，并且可以改变催化剂的表面组成，提高催化剂表面Ｃｒ３＋的浓度，从而影响催化剂的氧化脱氢活性。

《热分析》评介

热分析技术应用甚广,尤其自80年代初我国开始热分析学会活动以来,10余年间我国在该领域取得了长足的进步,尽管相继出现了一些热分析的译著和专著,但适于作教材的著述,由蔡正千编写的《热分析》(高等教育出版社1993年出版)还是第一本。作者基于多年从事热分析教学和科研的切身体会和坚实基础,用简明的语言,阐述了热分析的一些基本问题,作到了言简意赅,深入浅出。表现出如下一些明显特点: ·本书作为教材详简适度,布局合理。全书258页,21万字。首先从基本的物理化学概念,如物质的热学性质和热量传递等入手,接着讲解几种主要的热分析方法,再讲一些典型的应用示例。从上述几个侧面,可让学习者通过为数不多的课时就可了解热分析总的概貌。

二茂铁-AQ修饰碳纤维微葡萄糖传感器的研究

本文用二茂铁、AQ成功地制备了微葡萄糖传感器。Eastman-AQ(AQ-55D,AQ29D)是一种新型的聚合物(磺酸酯)阳离于交换剂,涂于电极表面上,形成的膜除具有强的附着力外,同时还具有预富集、离子交换及防污性能。制得的电极具有制作方法简单、快速、重现性好,抗干扰能力强等特点。检测上限15.0 mmol/L,响应时间小于6s。由于AQ强的附着力,二茂铁及酶的流失较小。电极的稳定性有所提高。

电子束法沉积ITO膜的XPS研究

采用电子束蒸发法制备了均匀、致密、透明导电的ITO膜。讨论了其光电性能,并用XPS技术研究了ITO膜的表面组成、结构和状态。

SOME NEWER CONCEPTS OF ETHYLENE ALPHA-OLEFIN COPOLYMERIZATION ON HETEROGENEOUS ZIEGLER-NATTA CATALYSTS

Unsteady diffusion kinetic, recently advanced by this laboratory, is applied to the examination of some polymerization and molecular chain structure problems. Hitherto deemed "anomalous" phenomena, such as the faster rate of copolymerization of ethylene/alpha-olefin than the homopolymerization of ethylene and the enrichment in the incorporation of a higher alpha-olefin in its copolymerization with ethylene by a lower alpha-olefin, are reasonably explained by unsteady diffusion of monomers. Molecular chain structure of copolymers, such as compositional heterogeneity and its dependence on comonomer incorporation originates from the difference in diffusion coefficients of the monomers. A copolymer composition equation taking into consideration the unsteady diffusion was developed. In cases where simulated curves were compared with experimental curves, good agreements were found.

AN ALL-SOLID-STATE LITHIUM POLYANILINE RECHARGEABLE CELL

The performance of an all-solid-state cell having a lithium negative electrode, a modified polyethylene oxide (PEO)-epoxy resin (ER) electrolyte, and a polyaniline (PAn) positive electrode has been studied using cyclic voltammetry, charge/discharge cycling, and polarization curves at various temperatures. The redox reaction of the PAn electrode at the PAn/modifed PEO-ER interface exhibits good reversibility. At 50-80-degrees-C, the Li/PEO-ER-LiClO4/PAn cell shows more than 40 charge/discharge cycles, 90% charge/discharge efficiency, and 54 W h kg-1 discharge energy density (on PAn weight basis) at 50-mu-A between 2 and 4 V. The polarization performance of the battery improves steadily with increase in temperature.

碳-13核磁共振定量测定萄葡糖及果糖的含量

本文利用~(13)C-NMR方法测量由葡萄糖通过葡萄糖异构酶的作用,在不同的条件下,在转化为果糖的过程中葡萄糖和果糖的相对含量。同时~(13)C-NMR技术也是直接测定各种构型糖含量的有效方法。实验结果表明,Gd-DPTA弛予试剂能够使自旋-晶格弛豫时间(T1)缩短。同时对NOE效应的消除也作了描述。本法测定的相对误差低于±0.5％。

STUDY ON THE COMPLEXATION OF ACENAPHTHENE AND FLUORANTHENE WITH CYCLODEXTRINS BY MEANS OF TIME-RESOLVED FLUORESCENCE TECHNIQUE

The complexation of acenaphthene and fluoranthene with beta-cyclodextrin (CD) in aqueous solutions in the presence and absence of ethanol was investigated by means of the time-resolved fluorescence technique. The appearance of a longer lifetime component and the increase of its fraction relative to that of the shorter lifetime component with increasing CD concentration demonstrate the formation of inclusion complex between the guest molecule and CD. The formation constants for complexation were derived from the pre-exponential factor A(i) of fluorescence decay curves. The presence of ethanol in the reaction systems enhanced the inclusion to a large extent.

藉时间分辨荧光技术研究二氢苊、荧蒽与环糊精的络合过程

用时间分辨荧光技术研究二氢苊、荧蒽与β-环糊精的络合过程以及乙醇分子对络合过程的影响,观察到它们在环糊精水溶液中有长寿命组份存在.证明这些分子与环糊精分子发生了络合作用,并根据荧光衰减曲线的指前因子计算出了它们的络合平衡常数.

Effect of stocking density on growth, settlement and survival of clam larvae, Meretrix meretrix

To determine the optimal larval density for hatchery culture of the clam Meretrix meretrix, experiments with stocking densities of 5, 10, 20, 40 and 60 larvae ml(-1) were designed, which included the developmental stages from D-veliger to 8 days postsettlement. Shell length, settlement time and survival rate of the larvae were recorded. Results showed that, at each sampling time, larvae reared at the highest density had the smallest mean size, whereas larvae reared at the lowest density had the largest mean size. Statistical differences in mean shell length at different stocking densities appeared from day 2, and greater differences occurred with increased culture time. Specific growth rate (SGR) in the rapid growing stage (day 0-3) was negatively correlated with density; however, no correlation was found between SGR and density in the slow growing stage (days 3-7). Settlement time was prolonged and shell length of settled larvae decreased as density increased. However, larval survival rate (74.8-79.1%) was independent of stocking density. Results showed that a high stocking density, in the designated range, is feasible for larval culture of the clam M. meretrix. However, for large-scale culture, in the interest of costs and safety, a stocking density of 10-20 larvae ml(-1) is recommended. (c) 2006 Elsevier B.V. All rights reserved.

Settling abalone veliger larvae in a free-swimming microalgal culture

In the current abalone hatchery in China, insufficient diatoms on vertically placed corrugated pvc plates at later stage often could not support the growth of postlarvae up to the stage that they can feed on live macroalgae. As a result, stripping the spats (35 mm) off by anaesthetization and switching the diet from live diatoms to artificial powdered diet in combination has to be performed in most of the abalone farms. This manipulation normally leads to more than 50% mortality. Here we report the direct use of the unicellular green alga Platymonas helgolandica Kylin var. tsingtaoensis as a potential alga to be used to settle the veliger larvae of the Pacific abalone Haliotis discus hannai and to feed the postlarvae. Settlement rate of 2-day-old veliger larvae in mono culture of P helgolandica could be as high as 92% ( +/- 4.2%) on day 10 in small scale trials, higher than that in the selected benthic diatom strain (53.6% +/- 12.7%) when settled in the water in which bacteria propagation was controlled by treatment of 2 ppm of benzylpenicillinum calcium and streptomycin sulfate. Postlarvae fed solely on P. helgolandica or the selected benthic diatom Navicula-2005-A grew at rates of 40.1 ( +/- 1.9) and 45.8 (+/- 13.4) mu m day(-1), respectively, when raised at 22 degrees C until day 50 postfertilization. P. helgolandica was shown to have distinct diurnal settling rhythm characterized with a peak of settled cells in the middle of the night for cell division and a peak of free-swimming cells in the middle of the day. High density of attached P. helgolandica cells on the inner surface of the culture facility in the night fits the nocturnal feeding behavior of the abalone spats. Judged by the promising larvae settling rate, growth and survival rates of the postlarvae fed with this alga, the free-swimming micro-green alga P. helgolandica constitutes a potential species for settling the veliger larvae and for supporting the growth of postlarvae as well. (c) 2006 Published by Elsevier B.V.