钢丝毛刷辊式静电纺PVA纳米纤维

设计了一种批量制备连续纤维的钢丝毛刷辊静电纺丝装置,研究了固定距离时溶液浓度及电压对毛刷PVA溶液静电纺丝产量的影响。考察了不同浓度PVA在不同纺丝距离、纺丝电压、毛刷转速下的纤维直径分布与纤维形貌。借助扫描电镜对制得的纳米纤维形貌进行观察,并应用Nano Measurer软件对纤维的直径及其分布进行了测量统计。综合考察结果,得出最佳的纺丝溶液浓度为12%,接收板距离为10 cm,电压为40 k V。     

PVA静电纺丝工艺优化研究

以聚乙烯醇(PVA)为原料、去离子水为溶剂,通过静电纺丝制备PVA纳米纤维膜,利用正交实验探讨静电纺丝过程中纺丝液PVA浓度、纺丝距离、纺丝电压和注射速度对PVA纳米纤维膜形貌及纤维直径的影响,得出制备纤维膜的较佳工艺条件,并分析了纺丝液PVA浓度对纤维膜的力学性能和亲水性能的影响。结果表明：随着纺丝液PVA浓度的增加,PVA纤维的直径逐步变小,直径分布变窄;当纺丝液PVA质量分数为7%、纺丝电压为14 kV、纺丝距离为14 cm、注射速度为0.5 mL/h时,纤维膜的纤维直径最小,为203 nm;正交实验中PVA浓度、纺丝电压、纺丝距离、注射速度4个因素的极差值分别为87.00,49.67,18.33,11.67;纺丝液PVA质量分数从5%增加到7%,纤维膜的断裂强度从2.21 MPa提高至2.81 MPa,断裂伸长率从31.63%提高至56.39%,水接触角从37.7°提高至48.7°。     

静电纺丝工艺对聚乳酸纳米纤维形貌及直径的影响

以N,N-二甲基乙酰胺为溶剂配制聚乳酸(PLA)溶液,采用静电纺制备PLA纳米纤维,探讨PLA溶液浓度、纺丝电压、接收距离对PLA纳米纤维形貌、直径及其分布的影响。结果表明:当PLA溶液浓度为10%、纺丝电压为24kV、接收距离为20cm时,纺丝效果好,纤维平均直径约91nm,且直径分布较均匀。     

静电纺间位芳纶纳米纤维的制备工艺参数

通过静电纺丝方法,将氯化锂/N,N–二甲基乙酰胺(Li Cl/DMAc)溶解间位芳纶(PMIA)制备了PMIA纳米纤维,探索了溶液浓度、接收距离、纺丝电压及接收速度等工艺参数对纤维形貌及其直径分布的影响。通过扫描电子显微镜观察了PMIA纳米纤维形貌及应用Image-J软件测量统计了PMIA纤维直径。结果表明,溶液浓度为8%~10%、纺丝电压为16~18 k V、接收距离为15~20 cm,接收速度60~80 r/min的范围内,间位芳纶纳米纤维成型良好,直径分布范围为100~120 nm;PMIA纳米纤维直径随着溶液浓度的减小、静电电压的增加而减小,随着接收速度的增加纤维取向增加。     

静电纺丝工艺对二醋酸纤维素纳米纤维形貌及直径的影响

以质量比为2∶1的丙酮/N,N-二甲基乙酰胺混合溶液为溶剂配制二醋酸纤维素(CA)溶液,采用静电纺丝制备CA纳米纤维,探讨了CA浓度、纺丝电压、接收距离和溶液推进速度等工艺条件对CA纳米纤维形貌、直径及其分布的影响。结果表明:CA纳米纤维的直径随CA浓度增加而增大,随纺丝电压增大而减小;适当的接收距离和溶液推进速度可以获得直径较小且分布均匀的纤维;当CA质量分数为11%、纺丝电压为30 k V、接收距离为15 cm、溶液推进速度为0.010 m L/min时,纺丝效果好,纤维平均直径约130 nm,且直径分布较均匀。     

丝素蛋白-聚乙烯醇共混改性电纺膜的制备

采用静电纺丝技术,以特殊设计的金属丝螺旋盘绕滚筒作为接收装置,制备了具有一定取向的丝素蛋白(SF)-聚乙烯醇(PVA)共混纳米纤维材料。利用扫描电子显微镜(SEM)对纤维形貌进行观察,并通过Image-Pro Plus软件对纤维细度进行测试,探讨了SF与PVA的配比以及纺丝电压、接收距离等静电纺丝参数对所得纳米纤维形貌、细度及其分布的影响。结果表明:将质量浓度为25 kg/L的SF与质量分数为8%的PVA以质量比15∶3.2共混,并采用20 kV的纺丝电压和13 cm的接收距离静电纺时,所得纳米纤维的平均直径约为238 nm,且直径分布较为均匀。采用该法制得的纳米纤维材料具有一定的纤维取向,有利于细胞生长,可应用于生物医药领域。     

生物高分子明胶纳米纤维膜的制备及其应用

利用电纺丝技术制备了明胶纳米纤维,系统考察了溶液浓度、电场强度、纺丝距离、喷丝口内径4种因素对纤维膜的形貌以及平均直径的影响;在此基础上,制备了具有较好力学性能的明胶-聚乙烯醇/溶菌酶复合纳米纤维膜,考察了其药物释放性能.结果表明,在上述几种工艺因素中,明胶的浓度对明胶纳米纤维的可纺性以及直径影响较大,当溶液浓度在7%-23%之间能获得连续纤维,并随着浓度的增大,纤维直径也随之增大.纺丝距离10cm、纺丝电压12.5kV是实验中获得连续纤维的临界工艺条件.药物释放结果发现明胶-聚乙烯醇复合纳米纤维膜对溶菌酶的释放具有一定的缓释效果.     

再生丝素蛋白/聚乙烯醇共混纳米纤维的静电纺丝研究

以静电纺丝方法制备再生丝素蛋白/聚乙烯醇共混纳米纤维。研究了共混配比、溶液浓度、添加剂含量及电纺电压、喷丝距离等因素对纤维成形及纤维有关性能的影响。研究表明:与聚乙烯醇共混后再生丝素纤维的柔韧性有一定改善,适当增加PVA在共混物中的含量、提高纺丝液浓度以及纺丝电压有利于改善共混溶液的可纺性。另外,加入丙三醇虽可使纤维直径的均匀性有所提高,但却不利于纤维成形。     

工艺参数对静电纺PPESK微纳米纤维膜性能的影响

通过溶液静电纺丝法制备了聚芳醚砜酮(PPESK)微纳米纤维膜,借助于扫描电子显微镜和拉伸试验机分别对纤维膜的形貌和力学性能进行了表征,用正交试验对微纳米纤维膜的制备工艺参数进行了优化。结果表明,在给定条件下,对纤维直径影响由大到小的工艺参数依次为:溶液浓度给料速度纺丝电压。纤维直径最小的工艺条件为:溶液浓度19%,纺丝电压10 k V,给料速度为0.04 mm/min。对纤维膜拉伸强度影响由大到小的工艺参数依次为:给料速度纺丝电压溶液浓度。纤维拉伸强度最大的工艺条件为:溶液浓度24%,纺丝电压14 k V,给料速度0.04 mm/min。     

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。     

聚乙烯醇纳米纤维膜的制备

采用静电纺丝方法制备了聚乙烯醇(PVA)纳米纤维,探讨了工艺参数对纳米纤维形貌的影响,并对PVA纳米纤维膜进行热处理,研究了热处理时间与温度对纳米纤维膜力学性能的影响。研究表明:PVA质量分数在6%~10%区间内变化时,可得到直径分布较为均匀的纳米纤维;在其它条件相同时,随纺丝电压的升高,PVA纳米纤维的不匀增大;接收距离的改变对PVA纳米纤维的直径变化影响不大;随PVA质量分数的增加,纳米纤维膜的断裂强度和断裂伸长率逐渐增大;在热处理时间相同时,PVA纳米纤维膜的断裂强度随温度的升高而增大;处理温度相同时,随处理时间的延长,PVA纳米纤维膜的断裂强度变化不大。     

Determination of optimal production parameters for polyacrylonitrile nanofibers

The object of this work is to determine the most suitable values of process and solution parameters for electrospinning of polyacrylonitrile (PAN) nanofibers including solution concentration, applied voltage, and working distance between the needle tip and the collector plate. To investigate the effects of those parameters on the fiber morphology, nanofiber mat samples were produced by changing the value of parameters systematically. The scanning electron microscope images of these samples were analyzed to realize the effects of these parameters on the nanofiber morphology. Our results demonstrate that the diameter of the fibers increases with increasing concentration. However, the diameter reduces as the applied voltage and working distance between needle tip and the collector increase up to a certain value. In addition to this, viscosity and applied voltage have a strong effect on the uniformity and morphology of the nanofibers. Moreover, a relationship between spinning distance, voltage supplied, solution concentration, charge density, bead formation, and the diameter of the electrospun PAN nanofiber were established in the study. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

静电纺丝工艺参数对丝素/壳聚糖纳米纤维的形貌及直径的影响

以98%的甲酸为溶剂,不同质量分数的再生丝素溶液和3.5%的壳聚糖溶液以质量比70:30共混静电纺丝。用扫描电子显微镜(SEM)观察了丝素质量分数、电压和极距(喷丝口到收集装置的距离)对丝素/壳聚糖纳米纤维的形貌及直径的影响。正交试验结果表明:在丝素/壳聚糖溶液静电纺丝的工艺参数中,对纤维平均直径的影响因素由大到小依次为丝素质量分数、电压、极距。单因素试验表明:丝素/壳聚糖纳米纤维的平均直径及其分布范围随丝素质量分数的增加而增大;在15￣30kV范围内纤维的平均直径随电压增大而减小;当极距大于12cm时,对纤维直径影响不大。最佳工艺条件为:丝素质量分数13%,电压30kV,极距为12cm,制得的纳米纤维平均直径104nm。     

Preparation of poly(ether sulfone) nanofibers by gas‐jet/electrospinning

Poly(ether sulfone) (PES) nanofibers were prepared by the gas‐jet/electrospinning of its solutions in N,N‐dimethylformamide (DMF). The gas used in this gas‐jet/electrospinning process was nitrogen. The morphology of the PES nanofibers was investigated with scanning electron microscopy. The process parameters studied in this work included the concentration of the polymer solution, the applied voltage, the tip–collector distance (TCD), the inner diameter of the needle, and the gas flow rate. It was found from experimental results that the average diameter of the electrospun PES fibers depended strongly on these process parameters. A decrease in the polymer concentration in the spinning solutions resulted in the formation of nanofibers with a smaller diameter. The use of an 18 wt % polymer solution yielded PES nanofibers with an average diameter of about 80 nm. However, a morphology of mixed bead fibers was formed when the concentration of PES in DMF was below 20 wt % during gas‐jet/electrospinning. Uniform PES nanofibers with an average diameter of about 200 nm were prepared by this electrospinning with the following optimal process parameters: the concentration of PES in DMF was 25 wt %, the applied voltage was 28.8 kV, the gas flow was 10.0 L/min, the inner diameter of the needle was 0.24 mm, the TCD was 20 cm, and the flow rate was 6.0 mL/h. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

小麦蛋白/聚乙烯醇复合纳米纤维的制备及其表征

以小麦蛋白、聚乙烯醇(PVA)为原料,采用静电纺丝法制备小麦蛋白/PVA共混复合纳米纤维,重点研究纺丝液质量分数、电压、接收距离对纤维形态的影响,利用扫描电镜、傅里叶变换红外光谱、X-射线衍射光谱对纤维的形态与结构进行表征。结果表明:在纺丝液质量分数10%、小麦蛋白与PVA质量比8∶2、电压12 kV、接收距离10 cm的条件下,可以制备平均直径为280 nm左右的均一、表面光滑的纳米纤维。小麦蛋白与PVA复合后,分子间以氢键结合。     

A comprehensive study on Plantago ovata/PVA biocompatible nanofibers: Fabrication,characterization, and biological assessment

In this study, a biocompatible nanofiber is fabricated using Plantago ovata mucilage (POM) combined with polyvinyl alcohol (PVA), which is considered as a non-toxic polymer. High quality nanofibers were produced by controlling the electrospinning parameters after selecting an appropriate solvent for the POM/PVA combination (12% PVA and 3% POM). Electrospinning parameters, including high voltage, distance from collector to tip, feed rate and POM to PVA proportion were optimized following preparation of an aqueous POM/PVA solution. Using the results of scanning electron microscopy, the optimized electrospinning conditions for producing POM/PVA nanofibers were determined (high voltage = 18 kV, distance = 15 cm, feed rate = 0.125 ml/hr, PMM/PVA = 50/50) and uniform nanofibers with an average diameter of 250 nm were produced. The POM/PVA nanofiber sample was evaluated by determining the mechanical strength, characterization of produced nanofiber morphology, and investigating the cell viability by applying MTT assay. The bands for both POM and PVA from FTIR results showed that the samples remained stable. The tensile strength results showed that blending POM with PVA solution enhanced the Young's modulus by factor of 3.2 (0.2 MPa to 0.64 MPa). The MTT analysis on POM/PVA cell lines proved that the produced nanofiber considerably enabled the cellular proliferation. Enhancement in these analysis indicated how POM-based nanofibers is a promising scaffold for cell culture, drug delivery systems and food additives.     

Effects of the tacticities of poly(vinyl alcohol) on the structure and morphology of poly(vinyl alcohol) nanowebs prepared by electrospinning

The effects of tacticities on the characteristics of poly(vinyl alcohol) (PVA) nanowebs prepared by an electrospinning technique were investigated. PVA webs composed of uniform nanofibers with syndiotactic dyad (s‐dyad) contents of 53.5 and 57.3% were successfully obtained with electrospinning. By changing processing parameters such as the initial polymer concentration, applied voltage, and tip‐to‐collector distance, we found suitable conditions for forming PVA webs with uniform nanofibers. PVAs of higher s‐dyad contents were prepared at a lower solution concentration and at a higher applied voltage because of the easy formation of syndiotactic PVA chain entanglements at a very low polymer concentration. The average diameter of the nanofibers in a PVA web with the higher s‐dyad content of 57.3% (ca. 240 nm) was thinner than that of the nanofibers in a PVA web with the lowers‐dyad content of 53.5% (ca. 270 nm). In addition, the crystallinity and thermal stability were greatly increased with an increase in the s‐dyad content. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007