辐射对PP/BR共混体系界面粘接的影响

研究了在多官能团单体异氰尿酸三烯丙酯（ＴＡＩＣ）存在下，辐射对ＰＰ／ＢＲ共混体系的影响，并用ＳＥＭ，ＤＳＣ和动态力学性能等技术对其进行了表征。结果显示，辐射引发ＴＡＩＣ参与的界面反应改变了ＰＰ／ＢＲ的形态结构，增强了两相的界面粘接，改善了相容性，提高了力学性能。

辐射增强PP/BR共混体系的力学性能

研究了在多官能团单体—三烯丙基异氰酸酯存在下，共混体系聚丙烯／１．４－聚丁二烯橡胶的辐射效应，用ＤＳＣ，动态粘弹谱对其进行表征。结果显示，三烯丙基异氰酸酯主要分布于聚丙烯／１．４－聚丁二烯橡胶共混物的界面处，在高能射线作用下，被引发参与界面反应，从而改善了共混体系的相容性，增强了界面粘接，提高了共混物的力学性能。

稀土BR／SBR共混胶的性能

研究了４种共混比的ＬｎＢＲ／ＳＢＲ共混生胶、混炼胶及硫化胶的性能，并与ＮｉＢＲ／ＳＢＲ共混胶进行了对比。结果表明，共混生胶的ＭＬ均低于ＬｎＢＲ及ＳＢＲ；当ＬｎＢＲ／ＳＢＲ共混比大于２０／８０时，呈现２个Ｔｇ；而大于８０／２０则出现应变诱导结晶现象。ＬｎＢＲ／ＳＢＲ共混混炼胶的ＭＬ、剪切应力、出口膨胀及硫化速度均低于ＮｉＢＲ／ＳＢＲ共混胶，挤出物外观优于后者；共混硫化胶的拉伸强度、热空气老化、拉伸疲劳、湿滑、耐磨等性能均明显优于后者，生热和透气率高于后者。

ELECTROCATALYTIC OXIDATION AND ION-CHROMATOGRAPHIC DETECTION OF BR-, I-, SO32-, S2O32- AND SCN- AT A PLATINUM PARTICLE-BASED GLASSY-CARBON MODIFIED ELECTRODE

A modified method for dispersing platinum particles on a glassy carbon (GC) electrode was investigated. The ultramicro Pt particle-modified electrode obtained exhibited high catalytic stability and activity towards the oxidation of some halide ions (Br-, I-) and inorganic sulfur species (S2O32-, SO32- and SCN-). These anions were separated and detected by using ion chromatography and electrochemical detection via this novel dispersed Pt particles-GC working electrode. The detection limits were 20 ng/ml for Br-, 1.0 ng/ml for I-, 10 ng/ml for SO32- and 4.0 ng/ml for SCN-. This method was employed for the analysis of industrial and environmental waste waters.

不同共混比Ln-BR/NR的性能

研究了稀土顺丁橡胶(Ln—BR)与天然橡胶(NR)以不同比例共混后生胶、混炼胶和硫化胶的性能,并与相同条件下的镍系顺丁橡胶(Ni-BR)/NR共混胶的性能进行了对比.结果表明,共混胶随Ln—BR用量的增大,ML_(1+4)~(100℃)降低,工艺行为良好,硫化胶力学性能、磨耗、湿滑指数和生热值下降,并且Ln—BR/NR硫化胶的抗湿滑性和动态疲劳性均优于Ni-BR/NR硫化胶.

用SBS或SBR或BR改进HIPS的冲击性能

采用机械共混法，在弹性体用量为５％～２５％时，研究了ＳＢＳ，ＳＢＲ，ＢＲ分别对ＨＩＰＳ的增韧效果。ＳＢＳ可使ＨＩＰＳ的冲击韧性大幅度提高，并随ＳＢＳ含量增加显著上升。ＳＢＲ也能提高ＨＩＰＳ的冲击韧性，但幅度不大。ＢＲ的加入使ＨＩＰＳ的冲击韧性下降。前两者的冲击试样断面平整而光洁，有明显的应力发白现象，属韧性断裂，后者的断面粗糙不平，无应力发白现象，属脆性断裂。改性ＨＰＳ的形态随着弹性体的不同以及含量的变化均有不同特点，与冲击韧性的变化相对应。

5－Br－PADAP作指示剂络合滴定法连续测定矿石中的锌和铜

本文在ｐＨ５．５的乙酸－乙酸钠介质中，对以５－Ｂｒ－ＰＡＤＡＰ作指示剂络合滴定法连续测定锌和铜进行了研究，对滴定的ｐＨ值及指示剂用量进行了选择，试验了锌、铜不同配比的滴定结果，研究了共存离子的干扰。实验表明，用５－Ｂｒ－ＰＡＤＡＰ作指示剂、ＥＤＴＡ作滴定剂连续测定锌和铜，滴定终点颜色变化敏锐，准确度高，锌和铜均在０～２０ｍｇ范围内与ＥＤＴＡ用量成正比，锌、铜比例在１：１０～１０：１范围内相互无影响，方法用于标样及金矿中锌、铜的连续测定，结果满意。

ANALYSIS OF ANGULAR OVERLAP PARAMETERS FOR THE LAOXEU3+ (X = CL, BR, I) SERIES

The Angular Overlap Model (AOM) is applied to the LaOX:Eu3+(X = Cl, Br, I) series involving sigma, pi, delta and phi effects based on the experimental energy levels. The calculations are made in two cases. (1) Consider oxygen and halogen having the same bond-length. (2) Consider the real structure. In both cases, the results show that for sigma-bonding parameters, the values of e(sigma) decrease with increasing charge number of halogen, i.e. Cl- > Br- > I-, this indicates that the bonding ability also decreases with this order. The absolute values of each parameter are much larger than zero-therefore they all must be included in a practical analysis. In the second case, the values of the e(pi) parameter are negative, which means a ''back-bonding'' is formed, and this is profitable for the formation of sigma-bonding, usually referred to as ''synergic effect''.

KX(X=Cl,Br,I)晶体中Eu~(2+)离子的4f~65d态能级计算

按着4f~6(~7F_J)和5dΓ_1耦合模型,提出了计算KX(X=Cl,Br,I)晶体中Eu~(2+)离子4f~65d能级的方法,导出了能级的参数表达式,并进行了数值计算,计算结果和实验符合较好.

动态光散射法研究BR的溶胶和凝胶

用动态光散射法(DLS)直接测定了镍系顺丁橡胶(NiBR)在环己烷溶液中溶胶分子的扩散系数D_0和流体力学半径R_h,求得两者与(?)_w的关系分别为:D_0=2.39×10~(-4)(?)_w~(-0.595),R_h=9.979×10~(-10)(?)_w~(0.595);分析了含凝胶的NiBR与钴系BR(CoBR)溶液中粒子的D及R_h的变化,结果看出,微凝胶的粒径比溶胶的粒径大1～2个数量级。

Eu~(3+):LaOX(X=Cl,Br,I)晶体的角重迭晶场参数计算

本文运用角重迭模型(AOM)在考虑其全部四个参数e_σ、e_π、e_δ及e_φ的基础上首次对Eu~(3+):LaOX(X=Cl,Br,I)晶体在晶场作用下的能级劈裂进行了拟合.

LaX_3(X=F、Cl、Br、OH)晶体中的化学键参数计算

稀土化合物中稀土离子和配位体的成键性质一直是人们注意研究的课题之一,一般认为属于离子键,但具有少量的共价性,然而,具体的数量级尚不清楚。本文利用Phillips,VanVechten和Levine理论,对LaX_3(X=F、Cl、Br、OH)晶体的键性和有关参数进行了具体计算,定量指出了镧离子和配体成键的离子性和共价性程度,比较了各晶体中有关的键参数,发现了和宏观物理现象相关的规律。1 理论公式

A NEW KIND OF CONDUCTING POLYMER POLYPYRROLE (PPY) BR- ION CHEMICAL SENSOR

The modification of conducting polymer polypyrrole(PPy) on glassy carbon(GC)by electrcchemical technique, and the study on doping effect of Br anion and electrochemical behavior of PPy film electrode were reported.A new kind of Br~- ion selective electrode has been prepared successfully.The mechanism of the electrode potential response is based on the doping effect of anion in the conducting polymer.Effect of polymerization conditions on the potential response characteristic is investigated in dtail.The PPy...