Preparation and properties of lithium sulfonated polyoxadiazoles electrolyte

以硫酸肼（HS）、对苯二甲酸（TPA）、4，4'-联苯醚二甲酸（DPE）为单体，发烟硫酸做溶剂和脱水剂一步合成了一系列不同TPA和DPE单体配比的磺化聚芳噁二唑（SPOD），再通过氢氧化锂中和得到聚芳噁二唑磺酸锂（Li-SPOD）聚合物电解质，采用浇铸成膜法制得Li-SPOD电解质膜，研究改变TPA和DPE两种单体配比对Li-SPOD结构及性能的影响。结果表明，几种不同单体配比均能实现在聚合过程中一步得到SPOD，磺酸基团接枝在DPE结构的苯环上，并且可以达到理论接枝量；同时Li-SPOD电解质膜的聚集态结构差异很小；热性能的表现均非常优异，初始热分解温度都在450 ℃以上；力学性能随DPE单体含量的增加稍有下降但依然保持在较高的水平；电导率约为10^-5S/cm级别，随DPE含量增加而逐渐降低；Li-SPOD固态电解质电化学稳定性较好，对锂稳定电化学窗口均在4.0 V以上。     

Effects of special nanoparticles on fuel cell properties of sulfonated polyethersulfone membrane

Polyethersulfone was sulfonated by changing the reaction time with sulfuric acid. The degree of sulfonation and ion exchange capacity were determined. Sulfonation of polyethersulfone was confirmed by FT-IR analysis and a new peak at 1025 cm^?1. Inorganic materials such as carbon nanotubes, graphene, and kaolinite nanoparticles were synthesized. The effects of three nanoparticles on thermal stability and water uptake of sulfonated polyethersulfone were investigated. The morphology of membranes were also altered due to the addition of inorganic materials. The proton conductivity of the modified membranes increased with respect to increase in relative humidity.     

Rheological and thermal stability of novel weak gels based on sulfonated polyacrylamide/scleroglucan/chromium triacetate

The present study deals with weak gels based on sulfonated polyacrylamide (SPA)/scleroglucan (SC)/Cr³⁺ with an exceptional thermal stability in electrolyte media. The rheological results showed that on increasing the SC concentration the shear viscosity and storage modulus of the SPA/SC/Cr³⁺ system were increased and the dependence of the storage modulus on frequency became weaker. The yield stress of the SPA/SC/Cr³⁺ system was higher than that of the corresponding SPA/SC system. The thermochemical stability increased with increasing relaxation time. The SPA/SC/Cr³⁺ semi‐interpenetrating network exhibited the lowest viscosity loss in electrolyte media; therefore this system may be a potential candidate for enhanced oil recovery applications. © 2016 Society of Chemical Industry     

Improving Blood Compatibility of Polyethersulfone Hollow Fiber Membranes via Blending with Sulfonated Polyether Ether Ketone

Appropriate membrane for blood contacting applications requires hemocompatibility and high permeation flux; it should inhibit proteins or platelets adsorption and still possess high permeability. Aiming to improve the polyethersulfone (PES) hollow fiber membrane hemocompatibility, sulfonated polyether ether ketone (SPEEK) is self‐synthesized in the present research and added to PES in different ratios. Scanning electron microscopy images have revealed significant changes in PES membranes structure after addition of SPEEK, which can influence water permeation property of the membranes. Water contact angles of the membranes have reduced from 75° to 50° after addition of 4 wt% SPEEK. Influence of SPEEK addition on hemocompatibility of the PES membranes is evaluated via protein (bovine serum albumin) adsorption, platelet attachment, and coagulation time (APTT and TT) assays. Obtained results reveal that hemocompatibility of the modified hollow fiber membranes is enhanced as a result of emerging repulsive forces between negative charges on the membranes surface and negatively charge blood components.

     

Ethanol‐responsive characteristics of polyethersulfone composite membranes blended with poly(N‐isopropylacrylamide) nanogels

Ethanol‐responsive smart membranes with different microstructures are prepared from blends of polyethersulfone (PES) and poly(N‐isopropylacrylamide) (PNIPAM) nanogels by immersion precipitation phase inversion method in a convenient and controllable manner. The introduction of PNIPAM nanogels forms the microporous structures on the surface of the top skin layer and on the pore walls of the finger‐like porous sublayer of membranes. The ethanol‐responsive characteristics of the proposed PES composite membranes are systematically investigated. With increasing ethanol concentration in the range from 0 to 15 wt %, the trans‐membrane flux of ethanol solution increases. The microstructures and the resultant ethanol‐responsive characteristics of the composite membranes can be regulated by the content of PNIPAM nanogels blended in the membranes. The more the content of PNIPAM nanogels blended in the membranes, the more the number of the submicron pores is, and thus the better the ethanol‐responsive characteristics of the composite membranes. The proposed ethanol‐responsive smart membranes are expected to be combined with the traditional pervaporation membranes as a smart vavle to achieve continuous and highly efficient ethanol production during the biological fermentation. The preparation technique and results in this study provide valuable guidance for further design and the industrial‐scale fabrication of novel composite membranes for application in ethanol separation systems. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41032.     

钻井液用阳离子型磺化酚醛树脂降滤失剂的研制

将阳离子结构单体在催化剂作用下引入酚醛树脂结构,再通过多步磺化反应制得阳离子型磺化酚醛树脂。简要描述了合成方法,检测了部分表征性能及作为水基钻井液降滤失剂的性能。在红外谱图中能清楚地看到阳离子结构。该结构样品在黏土颗粒上的饱和吸附量高达33.51 mg/g土,浊点盐度(以Cl-计)≥160g/L,参考石油天然气行业标准SY/T5094-2008将阳离子型磺化酚醛树脂200℃热滚16 h后在180℃,3.5 MPa条件下测试其滤失量,评价结果显示阳离子型磺化酚醛树脂的抗高温高压降滤失性优于现用SMP系列产品。     

制备参数对聚醚砜/非织造布复合膜空气过滤性能的影响

聚醚砜(PES)是一种综合性能优良的聚合物成膜材料,熔喷非织造布具有良好的过滤效能并广泛应用于空气的过滤.聚醚砜/非织造布复合膜是以PES膜材、致孔剂聚乙烯吡络烷酮(PVP)和溶剂N,N-二甲基乙酰胺(DMAc)作为铸膜液并涂覆在熔喷非织造布上,然后转移至凝固浴中成膜.通过控制铸膜液组分的不同比例、凝固浴温度和第一凝固...     

锡酞菁及其磺化衍生物的合成与性质研究

以苯酐和氯化亚锡为原料,采用固相法合成锡酞菁(SnPc),再和发烟硫酸反应合成磺化锡酞菁(SnPcS)。用元素分析,红外光谱,紫外光谱对它们进行了表征。结果表明:磺化锡酞菁的溶解性比锡酞菁要大得多;热稳定性研究发现,磺化锡酞菁从100℃开始失去磺酸基,400℃酞菁环才开始分解;且磺化锡酞菁在水中的氧化还原过程具有可逆性;同时,对磺化锡酞菁的电子光谱进行了研究。     

胺交联的磺化聚芳醚砜酮荷电膜的制备及微观结构

采用乙二胺(EDA),己二胺(HDA)和对苯二胺(PPD)为交联剂,与磺化杂萘联苯聚芳醚砜酮(SPPESK)反应生成磺酰胺交联键,制备胺交联的磺化杂萘联苯聚芳醚砜酮荷电膜.通过元素分析确定交联程度.采用示差扫描量热,扫描电镜以及应力-应变测试等方法研究交联膜的微观结构.实验结果表明,交联剂的种类、用量以及SPPESK的初始磺化度显著影响体系的相容性,交联剂用量过高会导致交联膜发生微观相分离,影响交联膜的性能.胺交联法制备荷电膜时交联度不宜过高.     

磺化PPEK掺杂磷钨酸混合膜的阻醇性及质子导电性能

磺化二氮杂萘酮结构的聚醚酮(SPPEK)与磷钨酸(PWA)的混合膜用两组分的DMAc混合溶液通过刮膜制备,对SPPEK/PWA膜进行了FTIR-ATR、表面形貌、质子导电性和甲醇透过性进行了研究.SPPEK/PWA膜的质子导率100%的相对湿度下80℃时质子导率为0.17S/cm,室温甲醇渗透系数为1.02×10-7cm2/s,比Nafion 117膜低20多倍.