尼龙66电纺纳米纤维膜的纤维分散形态和结晶性能

采用高压静电纺丝方法,制备了尼龙66电纺纤维膜,纤维的直径为纳米级。运用场发射扫描电镜(EFSEM)观察了纺丝液的浓度、电压、固化距离等参数对尼龙66电纺纤维膜的纤维分散形态和直径大小的影响,运用XRD分析了纺丝液浓度和电压对电纺纤维结晶度的影响。结果表明,纺丝液浓度对纤维分散形态有决定性作用,尼龙66电纺纤维膜结晶度比未纺丝的尼龙66的结晶度要低得多,并且电压对结晶度影响很大,电压增加使结晶度降低,电纺纤维膜的晶体结构趋于无定型。     

静电纺尼龙6／聚氧化乙烯复合纳米纤维毡的制备和性能测试

以尼龙6（PA6）／聚氧化乙烯（PE0）为原料配备复合纺丝液，通过高压静电纺丝制备出不同原料比例复合纳米纤维毡，再将纳米纤维毡进行水洗处理。应用电子显微镜（SEM）、原子力显微镜（删）观察分析纳米纤维毡经水洗处理前后的整体及单根纤维形貌。分析纳米纤维膜水洗前后孔隙率变化，同时通过亚甲基蓝吸附测试说明纳米水洗处理对纳米纤...     

气流-静电纺丝法制备尼龙6纳米纤维

本文采用自行研制的气流-静电纺丝设备制备了尼龙6纳米纤维,其设备的改进主要在于在原有的立式静电纺丝机的喷丝头上增加了气流喷射系统。经过实验确定了最佳纺丝工艺参数:纺丝液质量浓度为13%,纺丝电压为16kV,纺丝距离为10cm,气流流量为8L/min。对比气流-静电纺丝与普通静电纺丝发现,采用气流-静电纺丝不仅能制备较细、均匀的纳米纤维,而且产量更高。     

静电纺丝法制备尼龙-6/SiO2-TiO2杂化纳米纤维

采用静电纺丝法结合溶胶凝胶技术,制备了尼龙-6/SiO2-TiO2杂化纳米纤维。采用红外光谱（FT-IR）、X射线衍射（XRD）、UV-vis、热重分析（TG）和扫描电镜（SEM）等对杂化纳米纤维进行分析表征。结果表明,随着SiO2-TiO2溶胶的引入,电纺纤维的结晶度下降,耐热性能提升。尼龙-6电纺纤维的平均直径约为...     

尼龙66/蒙脱土纳米复合纤维的电纺制备与性能

以甲酸和二氯甲烷为溶剂,采用静电纺丝法一步法制备了尼龙66/有机蒙脱土纳米复合纤维。采用扫描电镜观测了纳米纤维的形貌和直径,尼龙66和尼龙66/有机蒙脱土纳米复合纤维的平均直径分别为(67±18)nm和(63±13)nm。傅里叶红外谱图显示尼龙66和蒙脱土之间出现了氢键结合。热失重分析表明,当蒙脱土与尼龙66的质量比为1∶100时,尼龙66/蒙脱土纳米复合纤维的起始分解温度和热分解峰值温度分别提高了26℃和39℃;紫外老化性能测试表明蒙脱土的片层阻隔效应使尼龙66/蒙脱土纳米复合纤维显示出更好的耐紫外老化性能;吸水率实验表明蒙脱土的加入使纳米纤维的吸水率下降了67.3%,耐水解性能提高。静电纺丝是一种可以制备性能更优越的尼龙66/粘土纳米复合材料的方法。     

原位聚合法制备PANI-TSA/PA6核壳纳米纤维

以静电纺丝技术制备出尼龙6(PA6)纳米纤维,并以该纳米纤维为模板,采用原位聚合法进行对甲苯磺酸(TSA)掺杂的聚苯胺(PANI)的合成,制备PANI-TSA/PA6核壳结构复合纳米纤维。应用傅里叶红外变换光谱测试仪(FT-IR)、场发射扫描电子显微镜(FE-SEM)对纤维的结构进行了表征;利用热重测试仪(TG)对纤维的热性能进行了表征。结果表明,采用该方法制备出了以TSA-PANI为壳、PA6为核的复合纳米纤维,且纤维形貌规整均匀,热性能优良。     

静电纺尼龙6/聚氧化乙烯复合纳米纤维毡的制备和性能测试

以尼龙6(PA6)/聚氧化乙烯(PEO)为原料配备复合纺丝液,通过高压静电纺丝制备出不同原料比例复合纳米纤维毡,再将纳米纤维毡进行水洗处理。应用电子显微镜(SEM)、原子力显微镜(AFM)观察分析纳米纤维毡经水洗处理前后的整体及单根纤维形貌。分析纳米纤维膜水洗前后孔隙率变化,同时通过亚甲基蓝吸附测试说明纳米水洗处理对纳米纤维毡吸附性能的影响。结果表明,PEO含量会对纳米纤维膜形貌、比表面积、孔隙率、吸附性能产生影响,而水洗处理会使纳米纤维的这些性能发生变化。     

电纺丝技术制备纳米/亚微米级取向纤维

静电纺丝是一种制备直径在纳米级到微米级超细纤维的新技术。普通的静电纺丝装置制备出的是无纺布状超细纤维,但有些场合需要使用取向纤维,因此文中介绍了制备取向纤维的方法,并成功地采用自制装置制备出取向的纳米/亚微米纤维,研究了电纺丝参数,如纺丝电压、溶液浓度、接收距离等对纤维取向的影响,最后对取向原理进行了简单分析。     

基于静电纺丝制备中空纳米纤维的研究进展

中空纳米纤维具有独特的中空结构和较大的比表面积，在吸附、催化、电化学、医药等领域具有广阔的应用前景。静电纺丝技术是制备中空纳米纤维的有效手段。随着静电纺丝工艺的不断成熟，利用静电纺丝大规模制备中空纳米纤维提上了日程。首先详细介绍了基于静电纺丝技术制备中空纳米纤维的原理和方法，探讨了现阶段基于静电纺丝技术大规模制备中空纳米纤维存在的问题以及研究现状，总结了中空纳米纤维的应用进展，最后指出了中空纳米纤维的发展方向，为推动中空纳米纤维的大规模制备及应用奠定基础。     

静电纺缓释抗菌纳米纤维的制备及抗菌性能研究

目的 解决天然抗菌剂精油封装到聚合物中的受控释放问题。方法 选用聚乙烯醇和纳米纤维素为主体材料，采用百里香精油为活性物质，通过静电纺丝技术制备纳米纤维。结果 采用质量比为3∶4的纳米纤维素水凝胶(质量分数1%)和聚乙烯醇水溶液(质量分数6%)，并加入质量分数为4%~10%的百里香精油制备纺丝液，在纺丝电压为16 kV、纺丝速率为0.8 mL/h、纺丝距离为11 cm、针头直径为0.7 mm的条件下制备了直径为100~150 nm的纳米纤维，并成功将百里香精油包埋在纳米纤维中。结论 所制备的纳米纤维可以达到百里香精油缓慢释放的效果，对大肠杆菌、金黄葡萄球菌、黑曲霉和橘青霉均有抑制作用。     

Alignment of carbon nanotubes and reinforcing effects in nylon-6 polymer composite fibers

Alignment of pristine carbon nanotubes (P-CNTs) and fluorinated carbon nanotubes (F-CNTs) in nylon-6 polymer composite fibers (PCFs) has been achieved using a single-screw extrusion method. CNTs have been used as filler reinforcements to enhance the mechanical and thermal properties of nylon-6 composite fibers. The composites were fabricated by dry mixing nylon-6 polymer powder with the CNTs as the first step, then followed by the melt extrusion process of fiber materials in a single-screw extruder. The extruded fibers were stretched to their maxima and stabilized using a godet set-up. Finally, fibers were wound on a Wayne filament winder machine and tested for their tensile and thermal properties. The tests have shown a remarkable change in mechanical and thermal properties of nylon-6 polymer fibers with the addition of 0.5?wt% F-CNTs and 1.0?wt% of P-CNTs. To draw a comparison between the improvements achieved, the same process has been repeated with neat nylon-6 polymer. As a result, tensile strength has been increased by 230% for PCFs made with 0.5% F-CNTs and 1% P-CNTs as additives. These fibers have been further characterized by DSC, Raman spectroscopy and SEM which confirm the alignment of CNTs and interfacial bonding to nylon-6 polymer matrix.     

Electrospun nylon-6 spider-net like nanofiber mat containing TiO2 nanoparticles: A multifunctional nanocomposite textile material

In this study, electrospun nylon-6 spider-net like nanofiber mats containing TiO₂ nanoparticles (TiO₂ NPs) were successfully prepared. The nanofiber mats containing TiO₂ NPs were characterized by SEM, FE-SEM, TEM, XRD, TGA and EDX analyses. The results revealed that fibers in two distinct sizes (nano and subnano scale) were obtained with the addition of a small amount of TiO₂ NPs. In low TiO₂ content nanocomposite mats, these nanofiber weaves were found uniformly loaded with TiO₂ NPs on their wall. The presence of a small amount of TiO₂ NPs in nylon-6 solution was found to improve the hydrophilicity (antifouling effect), mechanical strength, antimicrobial and UV protecting ability of electrospun mats. The resultant nylon-6/TiO₂ antimicrobial spider-net like composite mat with antifouling effect may be a potential candidate for future water filter applications, and its improved mechanical strength and UV blocking ability will also make it a potential candidate for protective clothing.     

Effects of three parameters on the diameter of electrospun poly(ethylene oxide) nanofibers

The combined use of two techniques namely electrospray and spinning is made use in a highly versatile technique called electrospinning, which produces the diameter of polymer fibers range from nanometer to sub-micron. In this work, we have studied effects of adding LiCl on the morphology and diameter of electrospun poly(ethylene oxide), and we have also evaluated systematically the effect of three important solution parameters on the morphology of electrospun poly(ethylene oxide): molecular weight, solution viscosity and electrical conductivity. We find that molecular weight is strongly correlated with the formation of bead defects in the fibers, the smaller molecular weight, the more beads defect density. As a result, the fibers have beads-in-string structures. Electrical conductivity increases, then decreases as molecular weight increases. Solution viscosity has been found to most strongly affect fiber size, with fibers diameter increasing with increasing solution viscosity according to a power law relationship. In addition, we find evidence that solution viscosity and electrical conductivity affect the interesting morphology of the electrospun nanofibers, and result in doubling and forming membrances phenomena.     

Polyamide 66/organoclay nanocomposite fibers prepared by electrospinning

PA66/organoclay nanocomposite fibers have been prepared by electrospinning melt pre-compounded PA66/organoclay nanocomposites in hexafluoroisopropanol. The influences of solution concentration and organoclay loading on the morphology of the electrospun fibers have been studied by scanning electron microscopy. The dispersion of organoclay in PA66 fibers has been characterized by X-ray diffraction and transmission electron microscopy, showing that partial exfoliation and partial intercalation state of organoclay can be obtained when organoclay content is as high as 7.5 wt%. Organoclay platelets are oriented parallel to the axial direction of the fibers. The influences of organoclay loading on the crystallization behavior of PA66 and mechanical properties of the electrospun fiber mats have been investigated. Only α crystals of PA66 were observed in the fibers regardless of organoclay loading. Organoclay shows strong reinforcing effect, leading to a significant increase in tensile modulus.     

Photocatalytic and antibacterial properties of a TiO2/nylon-6 electrospun nanocomposite mat containing silver nanoparticles

Silver-impregnated TiO(2)/nylon-6 nanocomposite mats exhibit excellent characteristics as a filter media with good photocatalytic and antibacterial properties and durability for repeated use. Silver nanoparticles (NPs) were successfully embedded in electrospun TiO(2)/nylon-6 composite nanofibers through the photocatalytic reduction of silver nitrate solution under UV-light irradiation. TiO(2) NPs present in nylon-6 solution were able to cause the formation of a high aspect ratio spider-wave-like structure during electrospinning and facilitated the UV photoreduction of AgNO(3) to Ag. TEM images, UV-visible and XRD spectra confirmed that monodisperse Ag NPs (approximately 4 nm in size) were deposited selectively upon the TiO(2) NPs of the prepared nanocomposite mat. The antibacterial property of a TiO(2)/nylon-6 composite mat loaded with Ag NPs was tested against Escherichia coli, and the photoactive property was tested against methylene blue. All of the results showed that TiO(2)/nylon-6 nanocomposite mats loaded with Ag NPs are more effective than composite mats without Ag NPs. The prepared material has potential as an economically friendly photocatalyst and water filter media because it allows the NPs to be reused.     

Nitric oxide-releasing electrospun polymer microfibers

The preparation of electrospun polymer microfibers with nitric oxide (NO)-release capabilities is described. Polymer solutions containing disodium 1-[2-(carboxylato)pyrrolidin-1-yl]diazen-1-ium-1,2-diolate (PROLI/NO), a low-molecular-weight NO donor, were electrospun to generate fibers ranging from 100-3000 nm in diameter capable of releasing NO upon immersion in aqueous solutions under physiological conditions (pH 7.4, 37 °C), with kinetics depending on polymer composition and fiber diameter. The NO release half-life for PROLI/NO-doped electrospun fibers was 2-200 times longer than that of PROLI/NO alone. The influence of polymer concentration, applied voltage, capillary diameter, solution conductivity, flow rate, and additives on fiber properties are reported and discussed with respect to potential applications.     

Biodegradable electrospun nanocomposite fibers based on Poly(2-hydroxy ethyl methacrylate) and bamboo cellulose

Electrospun fibers resemble extracellular matrix and are successfully being used in drug delivery and wound healing. The present study reports the extraction of cellulose from natural fiber such as bamboo which is cost effective. It was then added to Poly(2-hydroxy ethyl methacrylate) (pHEMA) solution and electrospun to obtain pHEMA-bamboo cellulose nanocomposite fibers. The characterization of the prepared bamboo cellulose, pHEMA-bamboo cellulose nanocomposite fibers were carried out using FTIR, XRD, TGA and SEM analysis. The biocompatibility of the prepared nanocomposite fiber were studied by MTT extraction method using Vero cell lines. Similarly the anticancer activity of paclitaxel incorporated nanocomposite fibers were assessed using MCF 7 cancer cell lines. The prepared nanocomposite fibers showed 96% cell viability and the paclitaxel incorporated pHEMA-bamboo cellulose nanocomposite fiber showed 7.4% cancer cell viability in 72 h. This proves the applicability of the prepared polymer matrix composite fiber as a fibrous mesh covering the affected skin area for skin cancers or wound healing.     

Mechanical properties of nylon-6/SiO2 nanofibers prepared by electrospinning

SiO₂ nanoparticles reinforced nylon-6 nanofibers were prepared by electrospinning of nylon-6/SiO₂ solution in formic acid. The effect of concentration and applied voltage on the diameter of the fibers was investigated. A nanoscale three-point bending test was used to evaluate the mechanical property of a single nylon-6/SiO₂ nanofiber. It was found that the elastic modulus of the nanofibers decreased with the increase in fiber diameter. This elastic modulus was in the range of 3.1-6.9GPa as the diameter ranged from 600 to 100nm.     

Hybrid analogs for the production of porous calcium phosphate scaffolds

A polymer–inorganic sol mixture has been used to develop interconnected and highly porous calcium phosphate networks. The inorganic sol was developed by reacting triethyl phosphite and calcium nitrate. The sol was directly added to an aqueous solution of PVA with molecular weights between 40,500 and 155,000 g/mol. This mixture was electrospun at a voltage of 20 kV to produce fibers, whose diameter was less than 1 μm. This electrospun structure was calcined at 600 °C obtain to a highly interconnected sub-micron fibrous network (fiber size ∼ 200 nm) of calcium phosphate. The crystal size is on the order of 30 nm. Micropores could be introduced in each of the fibers by controlling the polymer molecular weight and the sol volume fraction. Such structures can have many potential uses in the repair and treatment of bone defects and in drug delivery.