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2005年09月28日

【期刊论文】聚丙烯釜内釜外成核评价*

俞建勇, 张广平, 朱维平

合成树脂及塑料,2004,21 (1):15,-0001,():

-1年11月30日

摘要

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。

聚丙烯, 成核剂, 结晶行为, 力学性能

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2005年09月28日

【期刊论文】Allometric Scaling and Instability in Electrospinning*

俞建勇, Ji-Huan He *, *, a, b, Yu-Qin Wan b, c, Jian-Yong Yu b

International Journal of Nonlinear Sciences and Numerical Simulation 5 (3),243-252, 2004,-0001,():

-1年11月30日

摘要

e intriguing and enduring problems after the technology was invented by Formhals in 1934. Regulatory mechanisms for controlling the radius of electrospun fibers are clearly illustrated in the different states. Generally, the relationship between radius r of jet and the axial distance z from nozzle can be expressed as an allometric equation of the form r~zb, the values of the scaling exponent (b) for the initial steady stage, instability stage, and terminal stage are respectively-1/2, -1/4, and 0. Allometry in economy, biology, turbulence, astronomy, neural resistance, conductive textile, and macromolecule viscosity is also briefly illustrated.

electrospinning, polymer, nanofiber, allometric scaling, turbulence, intelligent textile, Mark-Houwink relationship, Hodgkin-Huxley model, neural model, resistance, modified Ohm law

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2005年09月28日

【期刊论文】FBGS在纺织复合材料中传感检测的误差分析

俞建勇, 杨斌(), 俞建勇(), 陶肖明()

纺织学报,2004,25(4):64~65,-0001,():

-1年11月30日

摘要

介绍纤维布拉格光栅传感器(FBGS)埋入纺织复合材料中的有效性及测量误差,并对存在问题提出探讨。结果表明:为确保测量效果,必须选择合适的涂层,最有效的方法是适当提高涂层弹性模量。

纤维布拉格光栅传感器(, FBGS), , 测量, 误差, 纺织复合材料

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2005年09月28日

【期刊论文】Allometric scaling for voltage and current in electrospinning

俞建勇, Ji-Huan He a, b, *, Yu-Qin Wan c

Polymer 45(2004)6731-6734,-0001,():

-1年11月30日

摘要

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.

Electrospinning, Polymer, Fiber

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2005年09月28日

【期刊论文】Controlling the Air Vortex Twist in Air-Jet Spinning

俞建勇, Y. C. ZENG, Yu-QIN WAN, AND C. W. Yu, JI-HUAN HE

Textile Res. J. 75 (2), 175-177 (2005),-0001,():

-1年11月30日

摘要

We present a simple analytical model for the forces that determine the strength of the air vortex twist acting on the yarns during air-jet spinning as a function of nozzle pressure, flow rate, jet orifice angle, and diameter of the jet orifice.

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  • 俞建勇 邀请

    东华大学,上海

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