共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
磺化聚醚砜纳滤膜性能研究 总被引:15,自引:4,他引:11
本文主要研究了磺化聚醚砜 (SPES)复合纳滤膜的性能。详细讨论了纳滤膜对不同溶质的分离特性 ;探讨了无机盐浓度 ,操作压力 ,溶液 p H值及磺化聚醚砜的离子交换容量(IEC)与膜性能的关系 ;并对纳滤膜的电性能进行了初步研究。研究结果表明 ,磺化聚醚砜复合纳滤膜为一荷负电性纳滤膜 ,对无机盐有较好的选择分离性能。磺化聚醚砜的离子交换容量 ,无机盐浓度以及操作压力对膜性能影响较大 ,且对于两性溶质 ,膜的脱除性能与溶液 p H值有关 相似文献
3.
4.
5.
磺化聚醚砜质子交换膜的制备及性能研究 总被引:3,自引:0,他引:3
以浓硫酸为溶剂、氯磺酸为磺化剂对聚醚砜(PES)进行了磺化,采用氢核磁共振谱(^1H NMR)、傅立叶变换红外光谱(FTIR)及热重分析(TGA)对磺化聚醚砜(SPES)进行了表征,证实PES得到了磺化。制备了一系列不同磺化度的SPES膜,测试了膜的接触角、含水率和电导率。试验结果表明,SPES具有良好的热稳定性;随着磺化度的增加,膜的亲水性能增加,膜的电导率增加。当SPES膜的磺化度达到37.0%(摩尔分数)时,SPES膜在室温下的电导率与商业化的Nafion 112膜的电导率相当。 相似文献
6.
介绍了聚芳醚酮的物理化学性质,主要对近年来研究的热点超支化聚醚酮改性、化学改性和磺化改性等进行了综述. 相似文献
7.
对甲苯磺化过程中的副产物二甲苯砜的生成原因及抑制作用机理进行了分析,综述了抑制磺化副产物二甲苯砜的方法。 相似文献
8.
本文主要叙述聚醚砜(PES)和磺化聚砜(S-PSF)共混之后膜性能的改善,得出共混膜要比单组分膜性能优良。并且,在加入致孔添加剂丙酮和聚乙二醇(PEG)后,膜性能得到进一步改善。 相似文献
9.
10.
11.
以降膜式SO3磺化合成鲸蜡油(SSW)为对象,考察了磷酸酯类表面活性剂(PES)对SSW形成复合体系的影响。通过比较拟三元相图中油相区域比例,确定3种SSW/PES复合体系中PES的最优用量:w(A8EO5PNa)=1.5%,w(A9EO5PNa)=1.0%,w(A12EO3PNa)=0.5%。根据最优配方研究了复合体系的表面张力、革表面动态润湿角、乳液稳定性、临界胶束浓度(cmc)及粒度分布。结果表明:SSW/A9EO5PNa复合体系表面张力为27.39 mN/m,润湿渗透能力强,临界胶束浓度低,乳液稳定性好,乳液平均粒径为78.7 nm,更适合应用于皮革加脂剂。 相似文献
12.
利用聚醚砜(PES)增韧TDE 85环氧树脂(简称TDE 85),通过扫描电子显微镜、动态热机械分析仪、差示扫描量热仪及傅里叶红外光谱仪等仪器研究了PES含量对TDE 85/PES复合体系微观形貌、力学性能和热性能的影响。结果表明,加入一定量的PES可提高TDE 85的力学性能和耐热性能,当PES的质量分数为8.00 %时,TDE 85/PES复合体系的拉伸强度、断裂伸长率和冲击强度最大分别提高了20.60 %、29.29 %和44.20 %;TDE 85/PES复合体系为两相结构,分散相PES呈不规则的变形颗粒分散在TDE 85中,PES增韧作用是由PES与TDE 85在固化过程中形成半互穿网络和压力下分散的PES微粒的变形所引起的。 相似文献
13.
环氧树脂是一种性能优良的热固性树脂,但是存在抗冲击性能差的缺点。聚醚砜(PES)是一种高性能热塑性树脂,与环氧树脂共混能够改善环氧树脂的韧性。系统研究了不同PES含量的PES/环氧树脂共混体系的流变特性和固化性能。通过对等温粘度曲线的数据拟合分析,建立了粘度模型,分析了PES对PES/环氧树脂共混体系粘度的影响机理,并通过DSC测试研究了PES对共混体系固化性能的影响。结果表明,PES在环氧树脂中的溶解过程可以引起共混体系粘度的波动,PES的引入缩短了PES/环氧树脂共混体系的凝胶时间,而且PES中的羟基对环氧树脂的固化具有促进作用。 相似文献
14.
15.
熔融纺丝法制备聚醚砜纤维 总被引:5,自引:0,他引:5
将聚醚砜(PES)树脂进行熔融纺丝,制得PES纤维,对PES树脂的可纺性、PES纤维的拉伸条件、力学性能、热性能、阻燃性能进行了研究。结果表明:PES树脂在熔融温度380℃,卷绕速度300m/min的条件下,可纺性较好;PES纤维适合在较低温度和较低速度下拉伸,在30℃下低速拉伸,PES纤维可拉伸3倍,其强度可达2.30cN/dtex;PES纤维的热稳定较好,其初生纤维的起始分解温度为442.15℃;PES纤维的阻燃性能较好,极限氧指数为26.9%。 相似文献
16.
The polymerization‐induced phase‐separation behavior of a thermoplastic [poly(ether sulfone) (PES)]‐ modified thermosetting bismaleimide resin during isothermal curing was investigated with differential scanning calorimetry, time‐resolved light scattering, and scanning electron microscopy with various contents and molecular weights of PES. The results suggested that the phase structure changed from a dispersed structure to a bicontinuous structure to phase inversion with an increase in the PES content. Three kinds of PES with different molecular weights were used to study the effects of the molecular weight on the phase structure and mechanical properties of modified systems. With higher molecular weight PES, a phase‐inversion morphology could be obtained at lower PES contents. The curing conversion of bismaleimide was affected by the composition of the blend. The curing rate decreased with an increase in the PES content. A blend with 15 wt % PES of a suitable molecular weight had a higher tensile strength and elongation at break than that without PES. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
17.
Miscibility of biodegradable poly(ethylene succinate) (PES)/poly(vinyl phenol) (PVPh) blends has been studied by differential scanning calorimetry (DSC) in this work. PES is found to be miscible with PVPh as shown by the existence of single composition dependent glass transition temperature over the entire composition range. Spherulitic morphology and the growth rates of neat and blended PES were investigated by optical microscopy (OM). Both neat and blended PES show a maximum growth rate value in the crystallization temperature range of 45-65 °C, with the growth rate of neat PES being higher than that of blended PES at the same crystallization temperature. The overall crystallization kinetics of neat and blended PES was also studied by DSC and analyzed by the Avrami equation at 60 and 65 °C. The crystallization rate decreases with increasing the temperature for both neat and blended PES. The crystallization rate of blended PES is lower than that of neat PES at the same crystallization temperature. However, the Avrami exponent n is almost the same despite the blend composition and crystallization temperature, indicating that the addition of PVPh does not change the crystallization mechanism of PES but only lowers the crystallization rate. 相似文献
18.
19.
将不同质量比的聚醚砜(PES)与聚酰胺6(PA6)共混进行熔融纺丝制得PES/PA6共混纤维;研究了共混物的流动性及其纺丝工艺,以及PES/PA6共混纤维的热稳定性和力学性能。结果表明:PA6的加入显著提高了PES的流动性,降低了纺丝温度,改善了PES的可纺性;与纯PES纤维相比,PES/PA6共混纤维的起始热分解温度有所降低,PES/PA6质量比为70/30~30/70的PES/PA6共混物的纺丝温度为320~340℃,卷绕速度为100~400 m/min,纤维的断裂强度为0.71~2.25 cN/dtex。 相似文献
20.
《分离科学与技术》2012,47(15):2287-2292
In this work, porous polyethersulfone (PES)/polyethylene glycol (PEG) ultrafine fibers were prepared via electrospinning technique, and then were used to removing endocrine disrupters from their aqueous solutions. The surface and the internal structures of PES/PEG ultrafine fibers were characterized by scanning electron microscopy (SEM) and the result showed that they were both porous. The porous electrospun PES/PEG ultrafine fibers can remove endocrine disrupters such as biphenyl A (BPA) and biphenyl (BP) effectively. Compared with pure PES ultrafine fibers, PES/PEG ultrafine fibers showed larger adsorption capacity and faster kinetics of uptaking target species. The hydrophilic properties and the porosity of porous PES/PEG ultrafine fibers can be controlled by adding hydrophilic materials such as polyethylene glycol (PEG), which can improve the adsorption properties of porous PES/PEG ultrafine fibers significantly. The results showed that porous electrospun PES/PEG ultrafine fibers had the potential to be used in environmental application and water treatment. 相似文献