Synthesis of copolymers of poly(ether sulfone ether ketone ketone) and poly(ether ketone diphenyl ketone ether ketone ketone) by electrophilic Friedel–Crafts solution polycondensation

A new monomer, 4,4′‐bis(4‐phenoxybenzoyl)diphenyl(BPOBDP), was synthesized via a two‐step synthetic procedure. A series of novel poly(ether sulfone ether ketone ketone)/poly(ether ketone diphenyl ketone ether ketone ketone) copolymers were prepared by electrophilic Friedel–Crafts solution copolycondensation of isophthaloyl chloride (IPC) with a mixture of 4,4′‐diphenoxydiphenylsulfone (DPODPS) and 4,4′‐bis(4‐phenoxybenzoyl)diphenyl (BPOBDP), in the presence of anhydrous aluminum chloride and N‐methylpyrrolidone (NMP) in 1,2‐dichloroethane (DCE). The copolymers with 10–50 mol% DPODPS are semicrystalline and have remarkably increased T_gs over commercially available PEEK and PEKK. The copolymers with 40–50 mol% DPODPS had not only high T_gs of 170–172°C, but also moderate T_ms of 326–333°C, which are extremely suitable for melt processing. These copolymers have tensile strengths of 96.5–108.1 MPa, Young's moduli of 1.98–3.05 GPa, and elongations at break of 13–26% and exhibit excellent thermal stability and good resistance to acidity, alkali, and common organic solvents. Copyright © 2009 John Wiley & Sons, Ltd.     

烯丙基乙基醚接枝聚硅氧烷气相色谱固定相的研究

合成了侧链为烯丙基乙基醚的聚硅氧烷气相色谱固定相,静态法涂柱,评价了其色谱性能.该固定相柱效高,易于涂渍,耐温达290℃,分离选择性好,适用于醇类和酯类的分离以及白酒样品的分析.     

Morphological investigations of block sulfonated poly(arylene ether ketone) copolymers as potential proton exchange membranes

A series of block sulfonated poly(arylene ether ketone) (SPAEK) copolymers with different block lengths and ionic contents were synthesized by a two‐stage process. The morphology of these block SPAEK copolymers was investigated by various methods, such as differential scanning calorimetry (DSC), transmission electron microscope (TEM), and small angle X‐ray scattering (SAXS). Dark colored ionic domains of hundreds of nanometers spreading as a cloud‐like belt were observed in TEM images. The sizes of the ionic domains as a function of block copolymer composition were determined from SAXS curves. The results for the evolution of ionic domains revealed that the block copolymers exhibited more clearly phase‐separated microstructure with increasing ionic contents and hydrophobic sequence lengths. Proton conductivity is closely related to the microstructure, especially the presence of large interconnected ionic domains or ionic channels. Block SPAEK membranes have interconnected ionic clusters to provide continuous hydrophilic channels, resulting in higher proton conductivity. Copyright © 2010 John Wiley & Sons, Ltd.     

SYNTHESIS AND CHARACTERIZATION OF POLY(PHTHALAZINONE BIPHENYL ETHER SULFONE KETONE)S FROM 4,4'-DICHLOROBENZOPHENONE

A series of poly(aryl ether sulfone ketone)s containing phthalazinone and biphenyl moieties were synthesized by aromatic nucleophilic displacement polycondensation of 4-(4-hydroxylphenyl)(2H)-phthalazin-1-one(DHPZ),4,4'- dichlorobenzophenone(DCB),4,4'-dichlorodiphenyl sulfone(DCS) and 4,4'-biphenol(BP) in different molar ratios.The obtained copolymers were characterized by different instrumental techniques(FTIR,TGA,DSC,WAXD,etc.).The inherent viscosities of these polymers were in the range of 0.43-0.56 d...     

Thermodynamics of aqueous solutions of poly ethylene glycol di-methyl ethers in the presence or absence of ammonium phosphate salts

Precise measurements of density and sound velocity at different temperatures ranging from 283.15 to 308.15 K for solutions of PEGDME250, PEGDME500 and PEGDME2000 in water and of PEGDME500 in aqueous solutions of 0.500 mol kg⁻¹ ammonium di-hydrogen phosphate ((NH₄)H₂PO₄) and di-ammonium hydrogen phosphate ((NH₄)₂HPO₄), binodal curves at temperature ranges 293.15-318.15 K for the aqueous PEGDME500 + (NH₄)₂HPO₄, PEGDME500 + (NH₄)₃PO₄, PEGDME2000 + (NH₄)H₂PO₄, PEGDME2000 + (NH₄)₂HPO₄, PEGDME2000 + (NH₄)₃PO₄ and PPG400 + (NH₄)₂HPO₄ two-phase systems, and liquid-liquid equilibrium data at temperature ranges 298.15-318.15 K for the aqueous PEGDME500 + (NH₄)₂HPO₄ and PEGDME2000 + (NH₄)₂HPO₄ two-phase systems have been taken. From the experimental density and sound velocity data, the apparent specific volume, excess specific volume, isentropic compressibility and isentropic compressibility deviation values have been determined and the effect of temperature, charge on the anion of electrolytes and molar mass of PEGDME on the volumetric and compressibility properties of the investigated polymer solutions as well as on the salting-out effect of PEGDMEs produced by ammonium phosphate salts has been studied.     

燃料电池用聚乙烯醇基碱性聚合物电解质膜的制备及其性能

通过在不同浓度KOH溶液中进行掺杂,制备出了聚乙烯醇(PVA)、聚乙烯醇/聚乙烯吡咯烷酮(PVA/PVP)和聚乙烯醇/聚乙二醇二甲醚(PVA/PEGDE)碱性聚合物电解质膜详细考察了膜的外观形貌、微观结构、热稳定性、离子电导率和化学稳定性等.结果表明,PVA与PVP以及PEGDE具有很好的相容性,所制备的复合膜断面致密...     

4,4’-二氯二苯酮合成二氮杂萘联苯酮结构聚醚砜酮的研究

以4-(4-羟基苯基)*2,3-二氮杂萘-1-酮(DHPZ)、4,4’-二氯二苯砜(DCS)和4,4’-二氯二苯酮(DCK)为原料,采用分步加料的方法,合成了系列高分子量的聚芳醚砜酮共聚物(PPESKs),其特性黏度在0.40 ～0.61dL/g之间,解决了由于DCK活性低不适合用于聚芳醚合成的问题.采用FTIR、示差...     

含二氦杂萘酮结构全芳香杂环聚合物的研究进展

高性能高分子材料在高温下仍保持优异的综合性能,是航空航天、电子电气、高速轨道交通等重要高技术领域不可或缺的材料。在不牺牲耐热性能的前提下改善高性能聚合物的加工性能一直是国内外研究的热点。含二氮杂萘酮结构高性能聚合物是高性能高分子材料的新成员。本文主要综述了含二氮杂萘酮结构的聚芳醚（包括聚芳醚砜酮系列、聚芳醚腈砜酮系列、...     

可紫外光交联氟代聚芳醚的合成及性能研究

以丙酮酸、苯甲醚为原料合成了1,1-双(4-甲氧基苯基)(BMPE)乙烯单体,并通过去甲基反应得到了含可交联基团的二酚单体1,1-双(4-羟基苯基)乙烯(BHPE),并且用核磁共振、飞行质谱及元素分析表征了单体的结构,DSC测试了单体的熔点.并将BHPE与全氟联苯(DFBP)在氟化钾和氢化钙的催化作用低温下进行缩聚反应,得到了一种可紫外辐照交联的氟代聚芳醚.通过核磁共振证明了所合成的单体以及聚合物的结构,凝胶渗透色谱(GPC)测定了聚合物的分子量.傅立叶变换红外光谱分析了聚合物紫外辐照下的交联反应.所合成的氟代聚芳醚在室温下可溶于氯仿、四氢呋喃等有机溶剂,紫外交联后不溶于任何有机溶剂.且合成的聚合物具有良好的热稳定性能(玻璃化转变温度为160℃,交联后的5%热失重为465℃).     

连续纤维增强含二氮杂萘酮联苯结构聚芳醚砜酮树脂基复合材料的界面

利用射频感性耦合冷等离子体(ICP)处理技术改性连续纤维表面,分别采用X射线光电子能谱(XPS)、原子力显微镜(AFM)及动态接触角分析(DCA)系统研究了等离子体处理时间、放电气压、放电功率等工艺参数对连续碳纤维、芳纶纤维和对亚苯基苯并二噁唑(PBO)纤维的表面化学成分、表面形貌、表面粗糙度及表面自由能的影响.研究结...