Instrumented impact testing of phenolphthalein polyether ketone

The Charpy impact fracture behaviour of unnotched specimens of phenolphthalein polyether ketone (PEK-C) was studied over a temperature range from room temperature to 220 degrees C by using an instrumented impact tester. The load-time and energy-time curves of PEK-C at different temperatures were recorded. From these curves, some important parameters, such as the maximum impact load, the maximum stress, the total impact energy, the crack initiation energy, the crack propagation energy etc., were obtained and their temperature dependences of PEK-C were investigated. The point of 100 percent maximum load on the load-time trace was shown to be the yield point. Two parameters, the ductile ratio (D.R.) and the ductility index (D.I.) were applied to characterize the ductility of PEK-C and their relationships to the relaxation processes were discussed.

IONIC-CONDUCTION OF A NOVEL COMB POLYMER ELECTROLYTE BASED ON MALEIC-ANHYDRIDE COPOLYMER WITH OLIGO-OXYETHYLENE SIDE-CHAINS

A comb-shaped polymer (BM350) with oligo-oxyethylene side chains of the type -O(CH2CH2O)(7)CH3 was prepared from methyl vinyl ether/maleic anhydride copolymer. Homogeneous amorphous polymer electrolyte complexes were made from the comb polymer and LICF(3)SO(3) by solvent casting from acetone, and their conductivities were measured as a function of temperature and salt concentration. Maximum conductivity close to 5.08 X 10(-5) Scm(-1) was obtained at room temperature and at a [Li]/[EO] ratio of about 0.12. The conductivity which displayed non-Arrhenius behaviour was analyzed using the Vogel-Tammann-Fulcher equation and interpreted on the basis of the configurational entropy model. The results of mid-IR showed that the coordination of Li+ to side chains made the C-O-C band become broader and shift slightly. X-ray photoelectron spectroscopy analysis indicated that the oxygen atoms in the two situations could coordinate to Li+ and this coordination resulted in the reduction of the electron orbit binding energy of F and S.

MISCIBILITY OF HOMOPOLYMER RANDOM COPOLYMER BLENDS .2. SMA/PMMA BLENDS

The miscibility of blends of PMMA with SMA (50 wt% MA) has been investigated by means of NMR, FTIR and DSC techniques. The results indicate that the SMA/PMMA blends are miscible on a molecular level, and there are strong intermolecular interactions between the phenyl groups in SMA and carbonyl groups in PMMA. It is the intermolecular interactions instead of the intramolecular repulsion forces within the SMA copolymer that make the SMA/PMMA blends miscible. It is also found that the strength of the intermolecular interactions to some degree depends on the compositions of the blends.

热致液晶PEI与PES—C共混物的研究

通过熔融共混，制备不同配比（２．５／９７．５～７５／２５）的ＰＥＩ／ＰＥＳ—Ｃ共混物，使用ＷＡＸＤ、ＤＳＣ、锥板流变仪、力学性能测试、ＳＥＭ等方法对共混物进行了研究。共混后强度、模量均有提高，在高剪切速率下，共混物的粘度有所降低。扫描电镜照片显示，共混物具有“皮芯”结构。

RHEOLOGICAL PROPERTIES FOR CONCENTRATED-SOLUTION OF CHITOSAN - DEPENDENCE OF SOLVENTS

Rheological properties for concentrated solution of chitosan were investigated in different solvents, such as HCOOH, CH3COOH, HCl and 0.2 mol.dm-3 CH3COOH+ 0.l mol.dm-3 CH3COONa aqueous solutions. It was shown that viscosities and flow behavior of the sol

酞侧基聚芳醚砜／对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物共混物的研究

酞侧基聚芳醚砜／对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物共混物的研究李刚，殷敬华，李滨耀（中国科学院长春应用化学研究所，长春，１３００２２）关键词酞侧基聚芳醚砜，热致性液晶高聚物，原位复合材料，对苯二甲酸乙二酯－对羟基苯甲酸嵌段共聚物将热塑性树脂与热...

壳聚糖浓溶液流变学性质研究——溶剂性质的依赖性

用不同pH值的HCOOH,CH_3C000H,HCl,0.lmol·dm~(-3)CH_3COONa+0.2mol·dm~(-3)CH_3COOH水溶液为溶剂,进行了壳聚糖浓溶液的流变学性质研究.实验结果表明,溶剂pH值相同时,壳聚糖在各种酸中的溶解性和溶液粘度差别较大.同一种酸中,在可溶范围内,pH值增加,溶剂变劣,粘度-浓度的幂律方程指数α增大.外加盐使溶剂变劣程度增加.在任何一种酸中,浓溶液粘度都随存放时间的延长而下降,流动指数n减小,流动活化能基本不变.

INHIBITION OF CORROSION BY HEXADECYL TRIMETHYL AMMONIUM BROMIDE LANGMUIR-BLODGETT MONOLAYERS ON CARBON-STEEL

Langmuir-Blodgett (LB) monolayers of hexadecyl trimethyl ammonium bromide (HTAB) were deposited onto a carbon steel surface to investigate the inhibition of corrosion by measurement of the polarization resistance and cyclic voltammetry. The corrosion proc

PHOTOELECTRON-SPECTRA OF VARIOUS CORE LEVELS IN SOME RARE-EARTH N-ACETYLVALINE BIOINORGANIC COMPLEXES

X-ray photoelectron spectra of some bioinorganic complexes of La, Pr, Nd, Sm, and Gd with N-acetylvaline have-been measured. The complex formation does not give any detectable influence on the binding energy of the N 1s peak in the amino group, but has some appreciable effect on the binding energy of the C 1s peak and the O 1s peak in the carboxyl and carbonyl group of the biological ligand. The spin-orbit splitting between the 3d5/2 and 3d3/2 core level of the rare earth ion in these bioinorganic complexes also becomes slightly larger than that of the free rare earth atom due to the effect of the crystal field from the biological ligands.

金属离子在液相氧化中的催化作用 XI.金属酞菁(MPc,M=Co、Fe)在异丙苯液相氧化中的催化作用

研究了MPc(M=CO、Fe)在异丙苯液相氧化中的催化作用,并考察了Py、bPy和菲绕啉等含N配体对MPc催化性能的影响.发现反应遵循配位-链锁反应机理.反应速度对异丙苯为1.5级,对催化剂为0.5级.反应活化能分别为53.1kJ/mol.(CoPe)和43.9 kJ/mol.(FePc).在所选择的反应条件下,异丙苯转化率较低(小于35%),生成过氧化氢异丙苯选择性约为100%.加入第五配体可使诱导期消失.电子光谱和反应动力学结果同时表明,反应是由O_2的配位活化引发的,ESR结果证明酞菁环的电子可和金属离子进行交换.

金属离子在液相氧化中的催化作用——Ⅹ.过渡金属氯化物与简单配体原位形成的配合物在环己烯氧化反应中的催化作用

本文研究了由过渡金属氯化物(MnCl_2、FeCl_2、CoCl_2、CuCl)与2,2′-二吡啶原位形成的配合物,在环己烯氧化反应中的催化性能以及配体性质对所形成的配合物催化性能的影响.结果表明,多种过渡金属氯化物可与2,2′-二吡啶原位形成有催化活性的配合物,其催化活性与金属离子性质、形成配合物能力以及配体性质有关.

热分解法制备希土氧化物超微粉末

超微粉未已被视为九十年代的新材料,它的许多奇特的性质和令人惊异的应用不仅引起人们的重视,并开展了许多研究。但目前对希土金属及其化合物的超微粉未的研究则报道甚少。尽管如此,希土超微粉未已经在磁性材料、超导材料、传感器、超高温耐热合金等方面获得应用,并取得了明显的效果。超微粉末的合成方法其多,但均不成熟、寻求合成希土超微粉末的方法则是一个重要的课题。我们在研究醇盐法制备氢氧化钕、氧化钕超微粉末的同时,采用热分解法制备了一系列希土氧化物超微粉末,观察了它们粒径变化的规律,得到一些新的结果。

Estimates of genetic parameters for growth traits of the sea urchin, Strongylocentrotus intermedius

Heritabilities and genetic and phenotypic correlations were estimated for body weight, test diameter, and test height of the sea urchin from measurements on progeny resulting from 11 sires and 33 dams by artificial fertilization of 3 females by single males, and measurements at 8, 10, and 12 months after metamorphism. Point estimate for heritabilities based on the sire components of variance were moderate to high for body weight (0.21-0.49), test diameter (0.21-0.47), and test height (0.22-0.37). Genetic correlations were significant for body weight with test diameter (0.30similar to0.65) and test height (0.30similar to0.54) and test diameter with test height (0.31similar to0.65). Genetic correlation estimates, derived the nested design and half-sib correlation analysis used in this study, appear to provide reliable estimates. Significant phenotypic correlations were found for body weight with test diameter (0.82similar to0.86) and test height (0.49similar to0.83), and test diameter with test height (0.47similar to0.84). The phenotypic correlations for test height with body weight (0.491) and test diameter (0.467) at 12 months' of age were smaller than those earlier sampling periods.(C) 2004 Published by Elsevier B.V.