纤维流变性能研究-New Fiber Technology (III) – Spinning of the Conductive Fiber (2/2)
2007-03-02 12:05
浏览:1273次
分享:
资料摘要:
In this work the unsteady-state contact angle at the interface between polymer melt and carbon black (CB) was measured. The transition of contact angle from an unsteady to a steady state can be divided into three stages, the unsteady thermo-stage, the wetting stage, and the reach of equilibrium contact angle. Subsequently, three critical indices, the unsteady heat-transfer period t0, the retardation time τ, and the contact angle at equilibrium state A∞ are defined herein. The decrease in contact angle against time can be simulated by an exponential decay that involves these three critical indices. Molten polypropylene (PP) and polystyrene (PS) have the smallest equilibrium angle A∞, followed by polybutylene terephthalate (PBT), and polymethyl methacrylate (PMMA) has the greatest angle. Interestingly, this order is strongly related to the solubility parameter of each polymer. The CB coated with sulfonated polyester slightly changes the equilibrium angle A∞, but drastically reduces the retardation
time τ for PP and PBT. This finding indicates that the CB, whose surface is modified by sulfonated polyester, can effectively reduce the compounding time of PP and polyester. Experimental results also reveal that reduce compact density slightly increases A∞ but barely affects τ. Furthermore, modifying PS with polybutadiene particles yields a high contact angle A∞ and a low τ value.
下载本篇资料:
纤维流变性能研究-New Fiber Technology (III) – Spinning of the Conductive Fiber (2/2)
150KB
相关资料
仪尊科技所有产品简要介绍,包括德国高特福公司,法国Metravib公司,英国Ray-ran公司,荷兰Fontijne公司,德国H&P公司的产品。
该文件为英文原版ISO11443的毛细管流变仪测试标准,详细的介绍了毛细管流变仪的结构及相关的测试原理及计算公式等。
目前,越来越多的DMA/DMTA 进入中国市场。让我们有更多的选择。然而,同时也会给我们在设备选型的时候带来很多困惑 - 什么样的DMA/DMTA 才真正满足我们的应用?力值范围和频率范围是两个最重要的指标。下面我仅从这两方面提几点看法,希望能对我们的选型有所帮助。
目前,越来越多的DMA/DMTA 进入中国市场。让我们有更多的选择。然而,同时也会给我们在设备选型的时候带来很多困惑 - 什么样的DMA/DMTA 才真正满足我们的应用?力值范围和频率范围是两个最重要的指标。下面我仅从这两方面提几点看法,希望能对我们的选型有所帮助。