共查询到18条相似文献,搜索用时 140 毫秒
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碳纳米管/聚合物纳米复合纤维静电纺丝研究进展 总被引:1,自引:1,他引:0
简述了静电纺丝装置的发展及其基本原理;介绍了静电纺丝制备碳纳米管/聚合物纳米复合纤维的技术进展,主要技术是碳纳米管在聚合基体中的分散性以及二者之间的界面结合力;详述了碳纳米管/聚丙烯腈纳米复合纤维和碳纳米管/聚氧乙烯(PEO)纳米复合纤维的制备及技术进展。指出今后应进一步发挥碳纳米管的性能,改进静电纺丝装置。 相似文献
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利用解析数值方法解在稳定的非等温状态下熔融聚合的纺丝方程式,得到沿纺丝轴Z的温度T(z)和丝条截面A(z)的关系式。 T(z)和A(z)与熔融聚合物的分子参数有关:粘度、密度和恒压比热,亦与纺丝条件有关:挤出速度、卷绕速度、空气温度,挤出温度和聚合物熔体流动速度。 而且,还得到了纤维质量与稳恒的熔体之间的关系。 从这些关系式中推导出了纺丝时的临界卷绕速度和临界挤出量。超过这些临界值时,熔融聚合物的断裂现象就会发生。 相似文献
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研究了自制的芳砜纶(聚砜酰胺)纺丝溶液的浓度、温度及聚合物的相对分子质量对纺丝溶液的流动曲线、粘流活化能、非牛顿指数和结构黏度指数的影响。结果表明:DMAc溶剂体系低温缩聚的芳砜纶纺丝溶液为切力变稀的非牛顿流体,芳砜纶聚合物相对分子质量增大、溶液浓度升高使纺丝溶液的非牛顿性增加,温度升高使其减小,其中浓度的影响最大。 相似文献
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《化学与生物工程》2018,(11)
利用聚酰胺酸(PAA)溶液和纳米碳化硅(SiC)混合物作为纺丝液,通过静电纺丝法制备聚酰胺酸/碳化硅(PAA/SiC)复合纳米纤维,PAA/SiC复合纳米纤维亚胺化后得到聚酰亚胺/碳化硅(PI/SiC)复合纳米纤维。研究了PAA溶液中PAA含量、纺丝电压、纺丝距离及SiC含量对PAA/SiC复合纳米纤维形貌的影响,利用热重法分析了PI/SiC复合纳米纤维的热稳定性。结果表明,使用固含量为15%的PAA溶液作为基体材料,再将纳米SiC以6%的含量均匀分散于基体材料中制备出纺丝液,在纺丝电压为10~18kV左右、纺丝距离为15cm时,可制备出直径250nm左右、光滑、连续、SiC分布均匀的PAA/SiC复合纳米纤维。PI/SiC复合纳米纤维热稳定性优异,氮气气氛中热分解温度为550℃。 相似文献
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Julan Duan Cuiqing Teng Keqing Han Muhuo Yu Wenxuan Wu Qijin Zhang Kin Seng Chiang 《Polymer Engineering and Science》2009,49(9):1865-1870
Fabrication of segmented cladding fiber (SCF) by bicomponent spinning was proposed in this article. In the new designed spin pack, we considered the high refractive component of cladding and core as a whole to control the cross section of the fiber. Quenching system in current bicomponent melting spinning system was modified according to the requirement of quenching fiber with a large size. The polymer SCF with required cross section was successfully fabricated using polycarbonate and polymethyl methacrylate. The transmission loss in the wavelength of 500–1000 nm was tested by the cut‐back method. The result showed that the transmission loss of the obtained fiber was comparatively high, being up to 30 dB/m. The output light pattern of the obtained fiber of 60 cm was collected by using a charge‐coupled device camera with laser light of 532 nm as the input. The output light pattern for the far field was a uniform circle and that for the near field was similar to the cross‐section designed. The results showed that the obtained fiber was still a multimode optical fiber because of the comparatively large refractive index difference between the two materials used. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers 相似文献
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Application of response surface methodology to evaluate the effect of dry‐spinning parameters on poly (ε‐caprolactone) fiber properties
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Bahareh Azimi Parviz Nourpanah Mohammad Rabiee Shahram Arbab Maria Grazia Cascone Andrea Baldassare Luigi Lazzeri 《应用聚合物科学杂志》2015,132(24)
Poly (ε‐caprolactone) fibers were prepared by dry‐spinning method. The effect of processing parameters on linear density, mechanical, and morphological properties of fibers was investigated using the response surface methodology (RSM). This method allowed evaluating a quantitative relationship between polymer concentrations, spinning speed, and draw ratio on the properties of the fibers. Polynomial regression model was fitted to the experimental data to generate predicted response. The results were subjected to analysis of variance to determine significant parameters. It was found that all three parameters had significant effect on linear density of fibers. Combined effect of concentration and spinning speed was observed in which the linear density of fiber was more sensitive to changes in the solution concentration at lower spinning speed. Polymer concentration had the largest influence on the mechanical properties of fibers. An average cross‐sectional radius of fibers was affected by concentration and draw ratio in opposite manner. Among all three parameters, only polymer concentration had significant effect on circularity of fiber cross sections. By applying the RSM, it was possible to obtain a mathematical model that can be used to better define processing parameters to fabricate dry‐spun PCL fiber in a more rational manner. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42113. 相似文献
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V. S. Soldatov 《溶剂提取与离子交换》2013,31(5):457-513
The works on synthesis and main properties of fibrous ion exchangers are reviewed in the paper. The main attention is paid to the FIBAN materials found practical applications in water treatment and air purification processes. The following methods for preparation of ion exchange fibers have been considered: mechanical mixing of inert fiber‐forming polymer solutions or melts with finely dispersed ion‐exchangers with their following spinning into fibers; preparation of composite fibers containing polymeric reinforcement in the polyelectrolyte body; spinning of specially prepared polymers containing ionizable groups and having fiber‐forming properties; grafting of ionogenic polymers (or polymers in which ionogenic groups can be introduced after grafting) onto polymer chains of the existing polymer fiber; polymer analogues conversion of existing polymeric fibers by introducing in their structure ionizable functional groups. Conditions for preparation of ion exchange fibers with high exchange capacity, optimal swelling and acceptable mechanical properties have been outlined. 相似文献
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聚丙烯腈熔融纺丝技术进展 总被引:5,自引:0,他引:5
叙述了聚丙烯腈的结构特征,丙烯腈聚合物的增塑,增塑和非增塑聚丙烯腈熔融纺丝工艺和纤维性质。熔纺制得的聚丙烯腈纤维,适用于纺织、地毯以及用作碳纤维原丝。增塑熔融纺丝技术已达到相当高的水平,熔纺纤维的形态与普通聚丙烯腈纤维类似,但存在皮芯结构,芯部有微孔。制得的聚丙烯腈基碳纤维原丝,拉伸强度达5.5~6.6cN/dtex,用这种原丝生产的碳纤维的拉伸强度约为3.6×103MPa,模量约为2.33×105MPa,伸长率约为1.5%,可制得性能优良的航空航天用复合材料。非增塑熔融纺丝,采用特定的丙烯腈聚合物和纺丝条件,不添加任何增塑剂,用普通熔融纺丝机在1000m/min或2000m/min以上的速度纺丝,经拉伸可得强度2.2~11cN/dtex、伸长率5%~30%和模量55~222cN/dtex的纤维。 相似文献
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PP/PA6复合超细纤维的研制 总被引:4,自引:2,他引:2
以 PP和 PA6为原料 ,采用复合纺丝技术 ,制成单丝纤度 2~ 3 dtex的常规纤维 ,该纤维在后加工过程中可以剥离成单丝纤度小于 0 .5 dtex的复合超细纤维。介绍了复合纺丝工艺 ,讨论了对纤维物理性能指标产生较大影响的工艺参数 ,试验制得的复合超细纤维截面清晰 ,在常温常压下可染 ,织物服用舒适性良好。 相似文献
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Carine Perrot Patrick M. Piccione Cécile Zakri Patrice Gaillard Philippe Poulin 《应用聚合物科学杂志》2009,114(6):3515-3523
The inclusion of nanoparticles in polymer fibers is potentially useful for improving or bringing new properties such as mechanical strength, electrical conductivity, piezoresistivity, and flame retardancy. In this study, composite fibers made of polyamide 12 and multiwall carbon nanotubes were investigated. The fibers were spun via a melt‐spinning process and stretched at different draw ratios. The influence of several spinning factors, including spinning speed, extrusion rate, and draw ratio were investigated and correlated to the structure and properties of the fibers. X‐ray diffraction analyses and mechanical tests indicated that the spinning speed barely affected the structure and mechanical properties of the fibers under tension. The spinning speed, however, is critical for future industrial applications because it determines the possible production rates. By contrast, drawing during spinning or after spinning strongly affected the polymer chain alignment and fiber mechanical properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献