IONIC CONDUCTIVITY IN THE COMPLEXES OF COMB-SHAPED POLYETHER WITH LITHIUM AROMATIC SULFONATE

Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient temperature and negative charge number of the added salts. Results show that anions can be partly immobilized by increasing their negative charges at lower temperature. Against discharge time the short circuit current of the battery （Li/complex film/Lix V3O8） is stabilized by increasing the anionic charge number of the complex.

SOLID-STATE VARIABLE-TEMPERATURE NMR STUDY ON THE PHASE SEPARATION OF POLYETHER POLYURETHANE ZWITTERIONOMERS

Polyether-polyurethane zwitterionomers based on 4, 4’-diphenylmethane diisocyanate(MDI), methyl diethanolamine (MDEA), and polytetramethylene oxide glycol (PTMO) werestudied with variable-temperature wide-line ~1H NMR. It is found that upon ionization, degree ofphase separation in the polymer system decreased at first due to the loss of hard segmentregularity, while further ionization increased the degree of phase separation through increasinghard phase cohesion and difference of polarity between hard and soft segments.

ION CONDUCTION IN COMPLEX OF ACRYLONITRILE-COPOLYMERIZED COMB POLYETHER WITH LITHIUM PERCHLORATE

Poly （oligoether methacrylate-co-acrylonitrile） s, P （MEOn- AN）, with oligoether pendants of different lengths were synthesized and the ion conduction property of their Li-salt complexes was studied as the function of polymer structure. At proper copolymer composition, lithium concentration and pendant length, the ion conductivity reaches 7.0×10-5S/cm at ambient temperature, together with improved mechanical strength. The ion transport in the polymer media is assisted by segmental relaxation, which is confirmed both by the consistency between ion conductivity and Tg and by the study of TSC.

IONIC CONDUCTIVITIES OF SEGMENTED POLYETHER POLYURETHANEUREA COMPLEXES WITH LiClO_4

Ionic conductivity values for segmented polyether polyurethaneurea （PEUU） complexes with LiClO4 were determined and values as high as～1.1×10-4 S·cm-1 at 353K and～1.0×10-5S·cm-1 at 306K were achieved. The ionic conductivity data were analyzed using the VTF （Vogel-Tamman-Fulcher） equation and WLF （Williams-Landel-Ferry） type equation. Values have been estimated for the "apparent" activation energies of ion transport from VTF equation and they lie in the range 2.70—5.53 kJ·mol-1.

IMMOBILIZATION OF POTENTIALLY BIOACTIVE MOIETIES ONTO POLYETHER WITH POLY(ETHYLENE GLYCOL)-SULFONATE SPACER

A new reactive graft copolymer, poly（tetramthylene glycol） - graft-w-propyl sodiumsulfonate-poly（ethylene glycol） （PTMG-g-PEG-CH2CH2CH2SO3-Na+）, was synthesizedby the cationic polymerization of a-w-bifunctional PEG macromonomer （O?CH2—PEG——CH2 CH2 CH2 SO3 Na） and THF. The obtained copolymer exhibits the expected structureas indicated by the result of characterization. Two amino acids （L-arginine, L-tyrosine）were covalently attached to the copolymer after converting the sulfonate group to sulfonylchloride. So the new reactive graft copolymer （PTMG-g-PEG-CH2CH2CH2SO3-Na+） isexpected to be very useful in attachment of potentially bioactive moieties to polymer viaa hydrophilic PEG spacer.

Synthesis of Arsamacrocyclic Polyethers

The synthesis of eight new arsamacrocyclic Polyethers was described. The structures of these compounds were characterized by elemental analysis, IR 1H-NMR and MS.

SYNTHESES OF POLYSTYRENE RESINS CONTAINING POLYETHER OLIGOMERS AND THEIR EXTRACTION FOR GOLD (Ⅲ)

Three polystyrene resins containing polyether oligomers as extractants were synthesized andtheir extraction properties were studied. Gold （III） ion could be extracted rapidly by the resins(T1/2,【lmin. )with high efficiency and capacity （for LS-B resin that were 99. 8% and 95. 8mg/gRrespectively） from aqueous solution but most of the co-existing metal ions such as Pd （II）,Cu（II）, Zn （II）, Pb （II） and Cd （II） were remained. The extraction capacity and strippingpercentage for gold （III） remained unchanged in four extraction-stripping cycles. The resins also showed good column extraction-elution properties.

Novel Silica Gel Supported Polyether Ionic Liquids: Efficient Catalysts Applied in Transformation of Carbon Dioxide

Three new catalysts based on the silica gel supported polyether ionic liquids(ILs), i.e., [HO-PECH-MIM]ClSi, [H2N-PECH-MIM]Cl-Si, and [HOOC-PECH-MIM]Cl-Si, were prepared, and their chemical structures were characterized by infrared(IR) spectroscopy and nuclear magnetic resonance(NMR) spectroscopy. Thermogravimetric analyzer(TG), X-ray diffractometer(XRD) and scanning electron microscope(SEM) were used to evaluate their thermal stability,crystalline structure and apparent morphology, respectively. Surface areas of the prepared catalysts were calculated by the Brunauer-Emmett-Teller(BET) method. The catalytic reaction for the synthesis of propylene carbonate(PC) using CO_2 and propylene oxide(PO) in the presence of the prepared catalysts was studied. The influences of times of recycling and catalyst structure on catalytic performance were also investigated. The experimental results showed that the silica gel supported polyether ILs catalysts successfully prepared under mild condition could possess the advantages of high activity, excellent thermal stability, good selectivity and easy recycling, while the phase transition of the liquid polyether ILs catalysts was also achieved. When the reaction temperature was 90 °C, the CO_2 pressure was 2.0 MPa and the dosage of the catalyst was 2.5%, [HOOC-PECH-MIM]Cl-Si was found to have the best catalytic performance in the catalytic process, with the conversion rate reaching 100% and the selectivity equating to 98.2%. The conversion rate and selectivity still could reach more than 90% even after the catalyst was reused for 15 times.

THE COORDINATION BETWEEN SILVER NITRATE AND OPEN CHAIN POLYETHER

A complex of silver nitrate with 1.8-bis（8’-quinolyloxy）-3.6-dioxaoctane （noted as ligand L） was synthesized. The results of element analysis show that it consists of the calculated values of [Ag4L3]（NO3）4. It is clear from the IR, UV and ’HNMR spectra that the ligand L coordinated to Ag+ ion with its N and 0 atoms which connected with the terminal quinolyloxy group.

Investigation of the Mechanical Properties of Flexible Polyether Foam Filled with Eggshell and Groundnut Husk Powder

The study investigated the effect of eggshell and groundnut husk as fillers on flexible polyether foam.The fillers with the particle sizes of 50μm each were mixed in the ratio of 50:50.Diverse percentages of the two combined fillers ranging from 10%,20%,30%,40%and 50%were incorporated into the polyether recipes in the appropriate foam formulations and foam samples were produced.The unfilled foam(0%filler)served as the standard control sample.The physico-mechanical test carried out on the foam showed increase in the properties such as density,compression set test,indentation hardness test,tensile strength test and decrease for elongation at break test as compared to the unfilled foam.The scanning electron microscopy result showed the cell sizes became smaller and concentrated with an irregular shape as the filler load increased,thereby making it denser and thicker.Eggshell and groundnut husk fillers may be used in the making of flexible polyether foam since these materials are organic in natures.They can improve the mechanical properties and biodegradability of polyurethane product.The utilization of these fillers in polymer composites productin will help in sanitizing the environment by reducing landfills and producing eco-friendly waste and also it influences cost positively.

Accelerated Approach to the Synthesis of Fluoriated Polyether Dendrimers

Fluorinated polyether dendritic sectors 4, 7 and 10 from the first to the thirdgenerations, respectively, were prepared by a convergent approach from readily availablepentafluorophenol, phloroglucinol and 1,3-dibromopropane. These dendritic sectors have goodsolubility properties and are stable in both acidic and basic media. Hence they are useful dendriticbuilding blocks for the preparation of functional dendrimers.

Impact of Mixed Fillers on the Physico-mechanical Properties of Flex­ible Polyether Foam

The effect of proportional blend of periwinkle and African star apple seed shell as bio-fillers in flexible polyether foam was studied.Flexible polyether foam samples incorporated with these bio-fillers at varying percentages;10%(S1),20%(S2),30%(S3),40%(S4)and 50%(S5)were produced respectively,while 0%(S0)which had no filler was used as control during the experiment.The mechanical properties of the produced foam samples were determined via density,compression set,indentation hardness,tensile strength and elongation at break tests.The cream time,rise time and height of the foam as parameters for characterising the produced foam samples were determined too.Flammability test was also carried out.The microstructure of the foam samples was analysed as well by using the scanning electron microscope.The results of the experiment showed that the density of the foam samples progressively increased from 19.20(S0)-26.45(S5)as the quantity of the filler increased.The indentation hardness result also showed an increase on addition of the filler.The foam’s loading ability also increased on incorporation of the filler but S3 showed remarkable recovery after compression.The tensile strength and elongation at break of the foam decreased on addition of the filler.The morphological analysis ascertained the effect of the progressive introduction of the filler on the surface morphology of the foam.The flammability of the foam was found to decrease as the filler load increased.Since these fillers are of organic origin,readily available,cheap and eco-friendly,they provide a means of making biodegradable foam,and reducing the flammability of foam.Thus,reducing environmental pollution whilst enhancing the mechanical property of foam.

Influence of Hydrogen Bonding on the Temperature-Accelerated Hydrolysis of Silicone Based Polyetherurethane

Temperature-accelerated in vitro degradation was established to estimate the longevity of polyurethane applied for long-term implantation.However,the prediction did not correlate well with the data from clinical explants and the rationality of accelerated in vitro test is still in a controversial due to the deviation.To improve the accuracy of the in vitro prediction,the influence of hydrogen bonding(HB)on the accelerated hydrolysis of silicone based polyetherurethans(SPEUs)extended with three side chains.Combining the temperature-controlled FTIR and the physical properties after temperature-accelerated in vitro degradation,it was demonstrated that side chain could increase the degree of hydrogen bond dissociation at higher temperature,resulting in the decrease of the calculated activation energy(E_(a))of hydrolysis.At low temperatures,changes in surface morphology and molar mass of PEUs are minimal and HB are less easily dissociated,which had barely impact on the hydrolysis resistance.It was proposed that the E_(a) will not be impacted and that the accuracy of prediction will be increased if the acceleration temperature is lower than 70℃ and HB change is less than 15%.

Synthesis and magnetic resonance of new heteropolynuclear Ln(III)-Cu(II) complexes with noncyclic polyether Schiff base

A series of novel heteropolynuclear complexes of Ln(III)\|Cu(II) and Cu(II) complex with noncyclic polyether Schiff base, salicylidene diethylene glycol diamine (SALDA), have been synthesized for the first time. The isolated complexes are formulated as [LnCu\-2(SALDA)\-3(NO\-3)\-5](NO\-3)\-2·4H\-2O (Ln=La, Pr, Nd, Sm, Gd, Tb, Er, Yb, Y) and [Cu(SALDA)(NO\-3)](NO\-3)·H\-2O. Synthesis methods are reported herein. The differences in their compositions, structures and coordination have been investigated by UV, IR, magnetic susceptibility, especially by 1 H and 13 C NMR spectra. It has been found that ν (CN) in the Ln(III)\|Cu(II) complexes are split up into two peaks with a far distance and it may be used as a probe for distinguishing them from others. In addition, it is suggested that the ethereal oxygen donors are not all coordinated. The good catalysis effect for the polymerization of methyl methacrylate (MMA) are reported for the first time. The results show that the catalytic activity of Nd\|Cu\|SALDA complex is better than that of the others and its syndiotactic sequence is ～72% as well, the conversion increases to 88%.

Structure dependence of intramolecular photoinduced electron transfer in 9-aminoacridine benzoyl esters dyads linked by a polyether chain

ELECTRON transfer plays a crucial role in energy transformation of natural biological systemssuch as the photosynthetic process by which plants convert solar energy into chemical energy.This is achieved in photosynthesis by a series of electron transfers which occur after light is ab-sorbed. Among the various factors which influence the efficiency of electron transfer struc-tural effect is one of the important features to be considered. In recent years, numerous syn-thetic model dyads in which electron donor and electron acceptor are covalently linked by dif-ferent spacers have been designed and synthesized in an effort to understand how the

Study on EPR Spectra of Three Gadolinium Complexes With Noncyclic Polyether Schiff Bases

The EPR spectra of three new gadolinium complexes with noncyclic polyether Schiff bases in powder and those of these complexes in organic solvents were investigated at different temperatures. It was observed that EPR spectra of nine and four peaks of Gd(Ⅲ) complexes in polycrystalline powder and freezing samples appeared at low temperature respectively for the first time. The interpretations of these results obtained on the basis of spin Hamiltonian of s = 7/2 system are satisfactory. The correlations of EPR feature between crystal-field strength in complexes and local symmetry around Gd3+ ions were revealed. The crystal-field parameters b20 and the asymmetry parameters λ’ of complexes were estimated. A series of interesting regularity and new results were obtained.

Rare earth complexes with noncyclic polyether-methionine Schiff base

A novel Schiff base (TAMET) was synthesized by the condensation of tetraglycol aldehyde with methionine and a mild oxidant CrO3· (C5H5N)2 was selected for the reaction. Seven new rare earth complexes with this Schiff base have been synthesized and characterized by elemental analysis, TG-DTA, molar conductivity, magnetic susceptibility and IR, especially 1H NMR spectra. Information was obtained from reflectance spectra and the coordination of sulfur atom to rare earths was discussed. The experimental results show that thesecompounds have some biological activity and could dispose of O2.

Friction and wear performance of polyether ether ketone(PEEK)polymers in three lubrication regimes

This experimental study investigates the friction and wear of three coatings commonly used in industrial applications,particularly in hydrodynamic bearings.The three materials under investigation were Babbitt,polyether ether ketone(PEEK)reinforced with 15%carbon fibers,and PEEK reinforced with 20%carbon fibers.The first polymer material was extruded,while the other was produced by fused deposition modelling(FDM).The materials were subjected to sliding tests in a pin-on-disc configuration,with a steel ball serving as the counter surface.The tests were conducted at room temperature,with a load of 10 N and under three different lubrication conditions:dry,grease,and oil.The linear speed was set at 0.3 m/s for the dry and semi-solid lubrication tests,while for the oil tests,the speed was set at 0.25 m/s.The greases used had consistency grades of NGLI 000 and NGLI 2.An ISO VG 68 circulation oil was used for the oil lubrication tests.Additionally,thermodynamic analyses were performed under the most severe conditions(i.e.,dry)to investigate the steel-Babbitt and steel-PEEK contact.

Research and Application of Anti-Collapse Lubricant Compound Polyalcohol for Water-Based Drilling Fluid

Polyalcohol is an environmentally friendly anti-collapse lubricant commonly used in water-based drilling fluids. It is generally composed of the single polyether or polyol, but its lubricity and anti-collapse inhibition can’t satisfy the application of current water-based drilling fluid systems well. Consequently, the laboratory has carried out research on the anti-collapse lubricant compound polyalcohol. The anti-collapse lubricant samples are mixed with lauryl polyether, nonylphenol polyether and Tween 80 according to different proportions. The cloud point, the reduction rate of lubrication coefficient and linear expansion are measured, and the change they caused should be observed. Then, the optimal ratio is optimized through orthogonal experiments. The results show that the increase in the content of the three kinds of polyethers respectively enhances the inhibition. When the content of lauryl polyether increases, the cloud point of the anti-collapse lubricant declines and the reduction rate of lubrication coefficient rises;when the content of nonylphenol polyether increases, the cloud point declines, but it has little effect on the reduction rate of the lubrication coefficient;when the content of Tween 80 increases, the cloud point rises, and the reduction rate of the lubrication coefficient first augments and then basically remains unchanged. The best mass ratio of lauryl polyether:TW-80:nonylphenol polyether is 6:3:4.

刚性链嵌段共聚物研究 Ⅱ．含双酚S的聚醚醚酮共聚物合成与性能

刚性链嵌段共聚物研究Ⅱ．含双酚Ｓ的聚醚醚酮共聚物合成与性能曹俊奎，苏文成，常春，郑玉斌，吴忠文（吉林大学化学系，长春，１３００２３）关键词聚醚醚酮／双酚Ｓ共聚物，多嵌段共聚物，结晶行为，热性能８０年代以来，聚醚醚酮（ＰＥＥＫ）已成为高性能材料领域十分...