酞侧基聚芳醚砜／聚苯硫醚共混物的断裂韧性

本文通过有缺口和无缺口冲击试验、断裂韧性测试以及结合扫描电镜分析断面形貌，研究了酞侧基聚芳醚砜／聚苯硫醚共混物的断裂行为，讨论了聚苯硫醚增韧聚芳醚砜的机理。结果表明，共混物冲击强度的改善主要是由于其裂纹引发能的提高；共混物断裂韧性提高的原因是由于外加应力场在ＰＰＳ微纤附近产生应力集中，促使基体和微纤都发生塑性形变，从而吸收更多的能量所致。     

Additive-effects during plating in acid tin methanesulfonate electrolytes

The effects of organic additives on the electrochemical and morphological deposit changes from acid tin methanesulfonate solutions are presented. In the absence of additives, tin deposition is diffusion-controlled with concomitant hydrogen gas evolution and the tin deposits are rough. Addition of polyethylene glycol suppresses hydrogen gas evolution yet has little effect on the mechanism of stannous reduction and the deposit structures. Polypropylene glycol enhances stannous reduction and produces a slightly smoother tin coating. The addition of phenolphthalein to solutions already containing the glycol additives results in a kinetically-controlled tin reduction process and a smooth matte tin deposit.     

Preparation and characterization of novel film adhesives based on cyanate ester resin for bonding advanced radome

In this paper, the novel film adhesives based on phenolphthalein poly(ether sulfone) (PES-C) and epoxy (EP) modified cyanate ester resin (CE) were prepared for bonding an advanced radome. The film adhesives are convenient for applying to manufacture, possessing good adhesion strength, thermal durability and excellent dielectric property. The curing behaviors were confirmed by differential scanning calorimetry (DSC), showing that the main reaction pathways are not varied with adding PES-C but the reaction rates are evidently accelerated, and the film adhesives can be well cured at lower temperature of 177 °C. The adhesion strength was evaluated in lap shear strength and peel strength, indicating that the better adhesion strength is obtained with increasing in PES-C. The maximum value of lap shear strength is 33 MPa at room temperature. The thermal durability was determined by thermal aging tests of lap shear specimens, showing that the decrease in strength gets faster with adding PES-C, and the usability of film adhesives over 2000 h at 200 °C. The dielectric properties were measured by dielectric resonator methods, finding that the introduction of PES-C brings a positive effect on dielectric properties. The lowest value of determined dielectric loss is 0.0075 at 10 GHz.     

A novel dual colorimetric fiber based on two acid-base indicators

A novel dual colorimetric fiber based on two acid-base indicators was synthesized by first aminating commercially available polyacrylonitrile fiber with tetraethylenepentamine and then covalently immobilizing ethyl orange moieties through an alkylation reaction and a diazo coupling reaction; finally, the fiber was grafted with phenolphthalein using a Mannich reaction. The functionalized fiber was characterized by elemental analysis, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier-transfer infrared spectroscopy (FTIR) and UV-vis spectroscopy, and its color-changing properties, response speed, reusability and photostability were all investigated. This fiber exhibits a remarkable color change from deep pink (pH < 1.1) to yellow (1.1 < pH < 13.0) and then to dark violet (pH > 13.0). Moreover, this fiber shows a fast response time (<1 s for 1 M HCl and 1 M NaOH), high photostability (>60 days) and excellent reusability (>300 times).     

物理老化对高性能热塑树脂酞侧基聚芳醚酮(PEK-C)长期使用行为的影响

物理老化是大多数高分子材料在使用过程中特别是在高温环境中不可避免发生的热力学 过程,其发生的速率快慢和程度大小都直接影响这类材料的使用性能,进而影响其使用寿命．因此 对物理老化过程的预测是这类材料应用的要求．本文用示差扫描量热（ＤＳＣ）技术,通过研究高性能 热塑树脂酞侧基聚芳醚酮（ＰＥＫ－Ｃ）在高温物理老化过程中其玻璃化转变温度（ Ｔｇ）随老化时间的 变化规律,所似模拟了老化初始阶段ＰＥＫ－Ｃ的Ｔｇ与老化温度（ Ｔａ）和老化时间（ｔａ）的关系,并运 用所得的参数预测了ＰＥＫ－Ｃ在正常使用温度下物理老化发生的可能性及程度,为确定这类材料 使用寿命打下了基础．     

Miscibility and phase behavior in blends of phenolphthalein poly(ether sulfone) and poly(hydroxyether of bisphenol A)

Miscibility and phase behavior in the blends of phenolphthalein poly(ether sulfone) (PES-C) with poly(hydroxyether of bisphenol A) (PH) were investigated by means of differential scanning calorimetry (DSC), high resolution solid state nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy (FTIR). It was found that the homogeneity of the as-prepared blends depended on the solvents used; N,N-dimethylformamide (DMF) provided the segmental mixing for PH and PES-C, which is confirmed by the behavior of single, composition-dependent glass transition temperatures (T_g's). To examine the homogeneity of the blends at the molecular level, the proton spin-lattice relaxation times in the rotating frame T_1ρ(H) were measured via ¹³C CP/MAS NMR spectroscopy as a function of blend composition. In view of the T_1ρ(H) values, it is concluded that the PH and PES-C chains are intimately mixed on the scale of 20-30 Å. FTIR studies indicate that there were the intermolecular specific interactions in this blends, involved with the hydrogen-bonding between the hydroxyls of PH and the carbonyls of PES-C, and the strength of the intermolecular hydrogen bonding is weaker than that of PH self-association. At higher temperature, the PH/PES-C blends underwent phase separation. By means of thermal analysis, the phase boundaries of the blends were determined, and the system displayed the lower critical solution temperature behavior. Thermogravity analysis (TGA) showed that the blends exhibited the improved thermal stability, which increases with increasing PES-C content.     

酞侧基聚芳醚酮拉伸屈服行为的研究

本文研究了酞侧基聚芳醚酮不同温度与不同形变速率下的拉伸屈服行为，发现屈服应力随温度升高而下降，随形变速率对数值的增大而增加，屈服应力对温度及形变速率的依赖性可用Ｅｙｒｉｎｇ理论来拟合，屈服能量随温度升高线性下降，从中可以求出屈服时所需热能与机械性能的比。杨氏模，屈服应变亦随温度升高而下降。     

Synthesis and Characterization of Sulfonated Cardo Poly(Arylene Ether Sulfone)s for Fuel Cell Proton Exchange Membrane Application

Sulfonated cardo poly(arylene ether sulfone)s ( SPPA ‐ PES ) with various degrees of sulfonation (DS) were prepared by post‐sulfonation of synthesized phenolphthalein anilide ( PPA ; N‐phenyl‐3,3′‐bis(4‐hydroxyphenyl)‐1‐isobenzopyrolidone) poly(arylene ether sulfone)s ( PPA ‐ PES ) by using concentrated sulfuric acid. PPA ‐ PES copolymers were synthesized by direct polycondensation of PPA with bis‐(4‐fluorophenyl)‐sulfone and 4,4′‐sulfonyldiphenol. The DS was varied with different mole ratios of PPA (24, 30, 40, 50 mol.%) in the polymer. The structure of the resulting SPPA ‐ PES copolymers and the different contents of the sulfonated unit were studied by Fourier transform infrared (FT‐IR) spectroscopy, ¹H NMR spectroscopy, and thermogravimetric analysis (TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymer with water. The ion exchange capacity (IEC) and proton conductivity of SPPA ‐ PES were evaluated according to the increase of DS. The water uptake (WU) of the resulting SPPA ‐ PES membranes was in the range of 20–72%, compared with 28% for Nafion 211®. The SPPA ‐ PES membranes showed proton conductivities of 23–82 mS cm^–1, compared with 194 mS cm^–1 for Nafion 211®, under 100% relative humidity (RH) at 80 °C.     

酚酞指示剂遇无水醇钠醇溶液变色的探讨

以实验为依据，得出了无水醇钠的醇溶液能使酚酞指示剂变色的结论，并对其可能的机理作以推断。     

酚酞合成中缩合剂的改进

以苯酚和邻苯二甲酸酐为原料,在使用无水氯化锌、四氯化钛和硫酸作复合缩合剂的条件下,加热进行缩合反应,可以缩短反应时间,提高酚酞收率。