Disc-Electrospun PCL Nanofiber Formed Micro-patterned Structure Scaffold

Disc-electrospinning using a disc as spinneret and a rotary drum as collector is a novel technology to prepare nanofiber which has been applied in tissue engineering scaffolds. In this study, nanofibrous mats with mlcro-patterned structure were fabricated via disc-electrospinning. Poly （ε-eaprolactone） （PCL） was dissolved in trifluoroethanol （TFE） at various concentrations （ 2 %-7 % ） （w/v） for electrospinning and the applied voltage ranged from 40 to 70 kV. Scanning electron microscopy （SEM） was employed to observe the morphology of the nanofibrous scaffolds. SEM images illustrated that the nanofibers with beads formed micro-patterned structure such as triangles and other polygons. The average diameter of nanofibers presented various size with the concentration increased from 2% to 7%. The beads on the nanofibers constructed the vertexes of the polygons, while nanofibers bridged between adjacent vertexes. The concentration of solution and applied voltage may be two dominant factors to influence the topological structure of the nanofibrons scaffolds. Cells cultured on the micro-patterned scaffold spread along the edges of the polygons. The scaffold with patterned structure may have a promising application in tissue engineering.     

Investigation on Nonwovens Leukocyte Filtering Materials Treated with Amine and Alkali Solution

Ｔｒａｎｓｆｕｓｉｏｎｂｌｏｏｄｏｒｂｌｏｏｄｃｏｍｐｏｎｅｎｔｓｗｉｔｈｗｈｉｔｅｃｅｌｌｓｏｆｔｅｎｃａｕｓｅｓｓｉｄｅｅｆｆｅｃｔｓｕｃｈａｓｆｅｂｒｉｌｅｔｒａｎｓｆｕｓｉｏｎｒｅａｃｔｉｏｎｓａｎｄａｌｌｏｉｍ ｍｕｎｉｚａｔｉｏｎ ,ｅｖｅｎｉｎｄａｎｇｅｒｏｆｌｉｆｅ[1,2 ] Ｉｎａｄｄｉｔｉｏｎ ,ｓｏｍｅｖｉｒｕｓｒｅｌａｔｅｄｔｏｔｒａｎｓｆｕｓｉｏｎｒｅｓｕｌｔｓｉｎｉｔｓｃｏｎｔａｍｉｎａｔｉｏｎｂｅｃａｕｓｅｏｆｔｒａｎｓ ｆｕｓｉｎｇｗｈｉｔｅｃｅｌｌｓｉｎｔｏｂｏｄｙ[3～ 5…     

聚己内酯多通道神经导管的制备及表征

神经导管(nerve guidance conduit,NGC)的通道数越多则越有利于神经再生,但受到技术和成本的限制,目前的多通道神经导管一般少于10个通道.为了制备通道数较多的NGC,采用边长10 cm的立方体铁架、直径0.15 mm的水溶性维纶纱线和直径3 mm的塑料空心管搭建一种牺牲模板,并结合冷冻干燥法制备直...     

熔喷聚丙烯非织造布的接枝改性工艺及性能研究

研究用过氧化苯甲酸引发丙烯酸和甲基丙烯酸接枝熔喷聚丙烯非织造布的主要影响因素。探讨了接枝反应时间,单体浓度、种类,引发剂浓度及熔胀剂对接枝的影响规律。并对接枝产品结构和相关性能进行了分析,结果表明通过接枝可提高非织造布的润湿性以达到医用过滤材料要求。     

烧毛轧光后整理对针刺非织造布性能的影响

烧毛轧光后整理会对针刺非织造材料的性能产生一定影响,研究后整理工艺对材料性能的影响有利于优化工艺参数,提高材料的综合性能.选取涤纶、玻璃纤维、聚苯硫醚(PPS)这3种纤维原料的非织造布试样进行烧毛和烧毛-轧光整理,并测试试样的透气性、强力、孔径、过滤效率.研究结果表明:烧毛-轧光整理后3种试样的透气率分别下降了31.6%,8.3%和42.2%;整理后试样的孔径上升较大,强力则变化不大,但过滤效率达到了99.99%,从而可有效地过滤细小颗粒.     

用于纺丝成网非织造布的聚合物熔体性能研究

运用纺丝法(Rheotens)和纯拉伸法(RME)研究分析两种聚合物PPU1780F1及NX50081的熔体拉伸流动性能。从熔体拉伸时瞬时拉伸粘度与应变、应变率的关系以及温度的影响,观察聚合物熔体拉伸变化规律。实验结果表明:聚合物熔体受力、拉伸粘度随应变、应变率和温度而改变。PPU1780F1拉伸粘度高,最大应变、应变率明显高于NX50081,适用于纺丝成网非织造布。而NX50081拉伸粘度低,不宜过多拉伸,可选作为注塑模压成型制品的原料。     

Investigation on Extensional Viscosity of Polymer Melts and Their Molecu-lar Structures

The extensional viscosity of three polyethylenes(LDPE,LLDPE and HDPE)melts was measured in-uniaxialelongational flow at a constant extension rate,as well asby the process of fiber spinning"Rheotens"and the entryflow methods.The melts showed the same melt flowingindex(MFI)but differed in their extensional viscositiesand attenuating forces,reflecting the differences in theirmolecular structures.The indirect methods could alsogive meaningful estimates for the extensional viscosity ofthe polymer melts,if the amount of the accumulated ex-tensional strain in each case was taken into consider-ation.     

羽毛纤维对Cu2+的吸附机理探究

采用电子顺磁共振(EPR),对吸附CuSO4溶液中Cu2+后的羽毛纤维进行检测;同时,采用傅里叶变换红外光谱(FT-IR)和广角X衍射(XRD)对吸附Cu2+前后的羽毛纤维进行检测,以探讨羽毛纤维吸附Cu2+的机理,研究结果表明:β折叠结晶结构上的胱氨酸可能与Cu(Ⅱ)形成配位结构.吸附Cu2+后,羽毛蛋白中出现更多的α螺旋构型,而β折叠构型相应减少.     

非织造滤材白细胞过滤模型研究

根据白细胞过滤过程中的质量守恒方程、白细胞浓度递减律,引入过滤系数,建立起血液中白细胞浓度关于过滤系数、滤材厚度、滤材面积、滤材最大捕获量及滤材过滤量的数学过滤模型。通过过滤模型计算得到的仿真值和实测的过滤效率具有很好的一致性。所建立的过滤模型可在理论上指导白细胞过滤器的设计和优化。