静电纺丝制备聚醚酮酮超细纤维

用溶液静电纺丝方法制备了聚醚酮酮超细纤维,用扫描电子显微镜研究了实验过程中纺丝电压、纺丝距离、流量、纺丝液浓度对于聚醚酮酮纤维直径和形貌的影响,并对多个纺丝参数的影响规律进行了分析。实验结果表明,在一定条件下纺丝电压和纺丝距离对纤维直径影响较小,而流量和纺丝液浓度能显著影响纤维直径,在小流量、低浓度容易得到较细的纤维,并且纤维直径分布集中。     

离心静电纺丝制备异麦芽酮糖醇纤维膜

可食用膜具有可食用、可降解以及绿色无污染等特点,具有极大的市场应用价值和良好的开发前景。利用熔体微分离心静电纺丝法制备可食用的异麦芽酮糖醇纤维膜,通过正交实验探究工艺参数对纤维形貌及吸湿保水性能的影响。结果表明,离心盘转速对纤维平均直径、纤维膜吸湿性影响较大,纺丝电压对纤维直径均匀性、纤维膜保水性影响较大。当纺丝温度为150℃、离心盘转速为3 000 r/min、纺丝电压为30 kV时,可制备平均直径为5.38μm、标准差为1.04μm的纤维膜;此时,纤维膜的吸湿率为25.36%,保水率为95.76%。通过熔体微分离心静电纺丝制备了异麦芽酮糖醇纤维膜,为其在可食用膜领域的应用提供了基础。     

静电纺丝法制备PVDF纳米纤维

静电纺丝法是聚合物溶液或熔体在静电作用下进行喷射拉伸而获得纳米级纤维的纺丝方法.聚偏氟乙烯(PVDF)具有优异的压电性能,而通过静电纺丝技术制得的聚偏氟乙烯静电纺丝膜具有高孔隙率、轻薄柔韧、透气性好等优点从而广泛应用在传感材料、电池隔膜和生物材料等领域.为了研究最适纺丝工艺,本文通过调节不同的纺丝电压、聚合物溶液浓度以...     

熔融纺丝法制备聚醚砜纤维

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%。     

静电纺丝制备纳米纤维的研究进展

纳米纤维具有直径小、比表面积大和易于实现表面功能化等优点,受到了广泛的关注,而静电纺丝技术被认为是制备聚合物纳米纤维最简单有效的方法,因此国内外学者对静电纺丝技术进行了详细的研究。简单介绍了静电纺丝技术的工作原理,详细阐述了影响静电纺丝的主要工艺参数,包括溶剂、溶液的浓度及黏度、电导率、工作电压、纺丝速度和接收距离等,并叙述了静电纺丝纳米纤维在过滤材料、传感器和生物医学等方面的应用,也指出了该技术存在的一些问题及其应对措施。     

熔融静电纺丝技术制备聚甲醛纤维

通过DSC测试得出聚甲醛的熔融温度为170℃,并通过试验确定最佳的纺丝温度为190℃。研究了聚甲醛质量分数和纺丝电压对静电纺聚甲醛纤维直径的影响,确定最佳的纺丝条件为:聚甲醛质量分数90%,电压14 k V。对聚甲醛纤维的表面形态及热性能进行了测试,结果显示:聚甲醛纤维表面光滑且粗细均匀;结晶度较高,为68.84%;熔点比纯聚甲醛熔点低,为160.25℃。     

聚合物离心静电纺丝技术研究进展

简述了离心静电纺丝技术的工作原理,对国内外近期离心静电纺丝的研究进展进行了综述.总结了离心静电纺丝的成纤机理,根据纺丝材料特性,将离心静电纺丝分为溶液离心静电纺丝和熔体离心静电纺丝两类,并将这两类纺丝方法的装置和工艺创新进行了分类,总结了各种装置的结构特征和优缺点,并对其工艺参数进行了分析.最后对离心静电纺丝微纳米纤维...     

静电纺丝制备纳米级纤维的研究

首先介绍了静电纺丝制备纳米纤维的原理及其影响因素,然后归纳、总结了当前国内外静电纺丝制备纳米纤维的研究内容,并对今后的研究提出了建设.     

静电纺丝法制备多孔超细聚醚砜纤维及其对双酚A的吸附性能

创新性地将静电纺丝法技术和沉浸凝胶方法相结合,制备了多种不同结构的多孔超细聚醚砜(PES)纤维,将多孔超细纤维运用于水溶液中环境激素双酚A(BPA）的吸附,并考查了多孔超细PES纤维对环境激素BPA的吸附机理。结果表明,以聚乙二醇(PEG）为致孔剂得到的多孔超细纤维的孔洞小而分布均匀,以聚乙烯醇(PVA）为致孔剂产生的多孔超细纤维的孔洞大且发生了取向;接收方式对以PVA为致孔剂的多孔超细PES纤维形貌影响大,空气浴中接收到的是多孔超细纤维,水浴中接收到的是中空多孔超细PES纤维;多孔超细PES纤维对环境激素BPA的动态吸附符合伪二阶动力学模型,等温吸附符合Freundlish等温模型。     

静电纺丝法制备聚乙烯醇-纤维素纳米纤维膜

以废旧涤棉混纺面料为原料,采用化学法对含棉成分进行溶解回收,将得到的纤维素粉末与聚乙烯醇(PVA)、Na Cl配成纺丝液,通过静电纺丝法制备出PVA-纤维素纳米纤维膜。对所纺纤维进行电镜观察,分析静电压、纤维素与PVA质量比、纺丝液中溶质质量分数对纺丝效果的影响。结果表明:随着电压增大,纤维直径先下降后上升;随着纤维素含量的增加,纤维直径逐渐变小;随着溶液浓度的升高,纤维直径逐渐变大。     

A Review on Current Nanofiber Technologies: Electrospinning,Centrifugal Spinning,and Electro-Centrifugal Spinning

Nanofiber-based products are widely used in the fields of public health, air/water filtration, energy storage, etc. The demand for nonwoven products is rapidly increasing especially after COVID-19 pandemic. Electrospinning is the most popular technology to produce nanofiber-based products from various kinds of materials in bench and commercial scales. While centrifugal spinning and electro-centrifugal spinning are considered to be the other two well-known technologies to fabricate nanofibers. However, their developments are restricted mainly due to the unnormalized spinning devices and spinning principles. High solution concentration and high production efficiency are the two main strengths of centrifugal spinning, but beaded fibers can be formed easily due to air perturbation or device vibration. Electro-centrifugal spinning is formed by introducing a high voltage electrostatic field into the centrifugal spinning system, which suppresses the formation of beaded fibers and results in producing elegant nanofibers. It is believed that electrospinning can be replaced by electro-centrifugal spinning in some specific application areas. This article gives an overview on the existing devices and the crucial processing parameters of these nanofiber technologies, also constructive suggestions are proposed to facilitate the development of centrifugal and electro-centrifugal spinning.     

特种工程塑料--聚醚醚酮

介绍了特种工程塑料聚醚醚酮（PEEK）的特性、用途及其国内外的生产和市场情况,并对其在我国的发展前景进行了展望。     

特种工程塑料聚醚醚酮的生产应用及发展前景

介绍特种工程塑料聚醚醚酮(PEEK)的性能特征、用途、生产方法、国内外生产和市场情况,并对其在我国的发展前景进行了展望。     

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.

     

Sulfophenylated Poly (Ether Ether Ketone Ketone) Nanofiber Composite Separator with Excellent Electrochemical Performance and Dimensional Thermal Stability for Lithium-Ion Battery via Electrospinning

In this investigation, the sulfophenylated poly (ether ether ketone ketone) (SPEEKK) separators for lithium-ion batteries (LIBs) are prepared via electrospinning. The electrospun sulfophenylated poly (ether ether ketone ketone) membranes (es-SP) are then modified with lithium bis(trifuoro-methanesulfonyl)imide (LiTFSI) by immersing in the LiTFSI/ethanol solution to obtain the modified es-SP composite separators (es-SP-Li). SPEEKK displays excellent dimensional thermal stability, and thus the thermal shrinkage of es-SP-Li-20 (20% of LiTFSI in ethanol) composite separators is only 2% after 0.5 h at 200 °C. The strong polarity of sulfonic acid groups on SPEEKK and LiTFSI enhances the electrolyte wettability and uptake, and thus afford more Li source, so as to promote the conductivity of lithium ions in the composite separators, which in turn exhibit positive impacts on the rate and cycling stability performance of LIBs. The Li//LiFePO₄ cells assembled with es-SP-Li-20 separator demonstrate excellent electrochemical stability over 170 cycles at 0.2 C with a reversible discharge capacity of 153 mAh g⁻¹, and a promising rate capacity at 2 C. In short, the as-prepared es-SP-Li composite separators with excellent comprehensive property emerge as a promising application in LIBs.     

Electrospinning of Technical Lignins for the Production of Fibrous Networks

Abstract

Electrospinning is an effective strategy to produce micron and sub-micron diameter fibrous networks from a variety of polymeric systems. Using seven different technical lignins the effect of lignin structure on fiber formation by electrospinning was studied. Surprisingly, none of the technical lignins could be electrospun into continuous fibers, although beaded fiber formation was observed for the softwood Kraft lignin system at high concentration (>50 wt%). However, the addition of poly(ethylene oxide) dramatically affected the electrospinning behavior and fiber formation. For all of the technical lignins a clear transition from electrospray or beaded fibers to uniform fibers was observed upon addition of poly(ethylene oxide); the lignin concentration dependent on poly(ethylene oxide) content. In all of the systems a linear increase in fiber diameter with increasing lignin concentration was observed. At the same concentration, the various lignin solutions had varying viscosities and different electrospinning behavior, that is, fiber diameter and ability to form uniform fibers, suggesting lignin specific structures and intermolecular interactions are influencing solution properties and electrospinning behavior. In fact, specific viscosity versus concentration plots reveal scaling exponents’, η ～ c^7.4–7.8 consistent with a branched polymer participating in intermolecular interactions such as hydrogen bonding or association complexes.     

三氯甲烷／乙醇混合溶剂对聚乳酸电纺成形影响的研究

用一系列不同组分配比的三氯甲烷／乙醇混合溶剂分别配制质量百分比浓度为4％和6％的聚乳酸（PLA）溶液,然后在相同纺丝参数下进行电纺成形。结果发现,随着乙醇在混合溶剂中体积含量的增加,聚乳酸溶液可纺性逐渐变好,电纺纤维的宏观形态也随之改变。研究了聚乳酸的溶液性质,结果认为,溶液可纺性改善的原因是乙醇的加入增强了高分子链之间的缠结程度,同时提高了溶液的电导率;溶液表面张力和表观黏度的改变对可纺性的影响较小。     

利用静电纺丝技术制备多孔聚苯乙烯纤维

利用静电纺丝技术制备聚苯乙烯（PS）聚乙烯吡咯烷酮（PVP）复合纤维,通过除去复合纤维中的PVP成分,成功地制备了PS多孔纤维,并对其进行了SEM谱图分析测试。结果表明,纺丝电压、PS与PVP配比直接影响着复合纤维的微观形态;PS／PVP复合纤维的浸泡时间、浸泡后的干燥方式、PS与PVP配比都会影响PS多孔纤维的表面形态以及纤维的内部结构。