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2005年09月28日

【期刊论文】Application of Vibration Technology to Polymer Electrospinning

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

International Journal of Nonlinear Sciences and Numerical Simulation 5 (3),253-262, 2004,-0001,():

-1年11月30日

摘要

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, nanofiber, viscosity, vibration technology, oscillation, temperature, spider silk, allometric scaling, oscillation-electrospinning, conductive fiber, intelligent fiber, self-cleaning clothing

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2005年09月28日

【期刊论文】Crystallization Behavior and Mechanical Properties of Polypropylene Copolymer by In Situ Copolymerization with a Nucleating Agent and/or Nano-Calcium Carbonate

俞建勇, Weiping Zhu, , Guangping Zhang, Jianyong Yu, Gance Dai

Journal of Applied Polymer Science, Vol. 91, 431-438(2004),-0001,():

-1年11月30日

摘要

The crystallization behavior of polypropylene (PP) copolymer obtained by in situ reactor copolymerization with or without a nucleating agent and/or nano-CaCO3 particles was investigated both by thermal analysis and by polarized light microscopy. The Avrami model is successfully used to describe the crystallization kinetics of the studied copolymer. The results of the investigation show that a dramatic decrease of the half-time of crystallization t1/2, as well as a significant increase of the overall crystallization rate, are observed in the presence of the nucleatingagent. These effects are further promoted in the presence the nano-CaCO3 particles. The incorporation of the nucleating agent and nano-CaCO3 particles into PP copolymer remarkably improved the mechanical properties and heat distortion temperature.

poly (, propylene), (, PP), , copolymerization, nanocomposites, nucleation, crystallization

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2005年09月28日

【期刊论文】FBGS在纺织复合材料中检测的可行性及有效性

俞建勇, 杨斌(), 俞建勇(), 陶肖明()

纺织学报,2004,25(3):48~49,-0001,():

-1年11月30日

摘要

分析了纤维布拉格光栅传感器(FBGS)埋入纺织复合材料中的可行性及有效性,结果表明FBGS埋入复合材料中不影响所测物体的应变场,在一定条件下,FBGS所测得的应变和温度能代表所测物体的应变和温度。

纤维布拉格光栅传感器(, FBGs), , 测量, 可行性, 有效性

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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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2005年09月28日

【期刊论文】聚丙烯接枝交联物的结晶行为

俞建勇, 张广平, 王善元

高分子材料科学与工程,2003,19(6):115~122,-0001,():

-1年11月30日

摘要

以马来酸酐(MAH)和三烯丙基异氰脲酸酯(TAIC)固相法接枝等规聚丙烯(iPP)制备了高接枝率、高极性的PP接枝交联物,并研究了接枝物的流变特性、结晶与熔融行为和结晶形态。在接枝链上引入TAIC后稳定了分子结构,熔体流动速率减小。接枝物的结晶峰温、熔融峰温、结晶度及结晶速度均低于纯PP。但是较高接枝率的交联物的成核作用很强。其等温结晶行为不同于PP和MPP,成核和生长方式为瞬时成核的二维晶粒生长。

聚丙烯, 马来酸酐, 交联接枝, 熔融与结晶行为, 结晶动力学

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    东华大学,上海

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