Electrospinning is a novel process for producing superfine fibers by forcing a polymer melt or solution through a spinnerette with an electric field. Application of vibration technology in polymer processes such as injection molding, extrusion and compression molding/thermoforming proved that it works well in reduction of melt viscosity and enhancement of mechanical properties of polymer products. Theory analysis experimental data reveal many parameters, such as fiber diameter, threshold voltage, fiber strength, are related to the polymer viscosity. The paper has dual aims, one is to produce finer nanofibers under lower applied voltage by vibration technology, the other is to reduce the applied voltage to increase the fiber strength. The paper draws attention to possible of spinning fibers with lower threshold voltage and higher mechanical strength.

Electrospinning is a simple method used in the preparation of polymer fibers, the diameter of the electrospun fibers, varying in large from micrometer to nanometer, mainly depends upon the electrical field applied. The non-linear relation between the current of charged jet and the applied voltage is an intriguing and enduring problem. An allometric scaling relation between the current and voltage is obtained. He Chengtian' s inequality, which has millennia history, is applied.

借助于热分析和力学性能测试考察了釜内与釜外添加成核剂对聚丙烯（PP）结晶行为和力学性能的影响。研究结果表明：2种添加方式对PP结晶温度影响不大，而釜内成核方式能更进一步提高结晶速率，成核PP的弯曲模量、低温抗冲击性能和热变形温度显著提高。

It is first proposed that textile structures made of stainless steel (SS) fiber can be used to measure large strain under high temperature Four knitting structures are designed and applied as strain sensor In this paper, it is observed that the resistance of SS fiber fabric has a linear relationship with strain within a definite range Any change in fabric structure may cause changes of the linear range and sensitivity of the strain sensor The effect of the maximum strain of tensile cycle on the sensitivity has also been discussed Based on the experimental result, a strain sensor of SS fiber textile structure has been designed and tested The main mechanism of fabric sensing has been deduced to be the change of contact resistance between yarns during stretching. It is proved that this SS fabric can be used to monitor strain change in various technological areas

Polyacrylonitrile (PAN) is used to study the effect of surface charge on electrospinning by adding LiCl. The theoretical analysis shows that the relationship between radius r of jet and the axial distance z from nozzle follows an allometric law in the form r～z-0.5 in case of full surface charge, and the scaling exponent becomes larger for partly charged fibers in electrospinning.