Influences of the Viscosity Ratio and Processing Conditions on the Formation of Highly Oriented Ribbons in Polymer Blends by Tape Extrusion

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• 作者：Long Wang ; Lian-Fang Feng ; Xue-Ping Gu ; Cai-Liang Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：54
• 期：44
• 页码：11080-11086
• 全文大小：522K
• ISSN：1520-5045

文摘

The deformation of the dispersed phase in polymer blends by tape extrusion was studied systematically under different processing conditions and viscosity ratios of the dispersed phase to the matrix. During tape extrusion, the spherical dispersed phases were first elongated into rotational ellipsoidal or rodlike shapes and then merged to form longer and even endless microfibrils by coalescence, which were eventually squeezed into highly oriented ribbons. The speed of two running rollers has a large effect on the morphology development of the dispersed phase. With an increase of the roller surface speed, the stretching and squeezing forces increased dramatically. As a result, the dispersed phase gradually deformed from spherical to ellipsoidal, fibrous, and ribbonlike shapes. More interestingly, the tensile strength of the obtained blend film with highly oriented ribbons increased significantly as well. The viscosity ratio of the dispersed phase to the matrix is another important factor influencing the formation of a highly oriented polymer blend. It is found that a low viscosity ratio facilitates the deformation and coalescence of the dispersed phase to form highly oriented ribbons. Therefore, in order to prepare a well-controlled polymer blend with highly oriented ribbons, the combination of a high-viscosity matrix and a low-viscosity dispersed phase is preferred.