【摘 要】
：
The apparent shear viscosity (ηa) of a blend composed of 97 wt % high-density polyethylene (HDPE) and 3 wt % polyamide (PA-66) was measured by capillary rheome
【机 构】
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Department of Polymer Science and Engineering,Key Laboratory of Macromolecular Synthesis and Functio
论文部分内容阅读
The apparent shear viscosity (ηa) of a blend composed of 97 wt % high-density polyethylene (HDPE) and 3 wt % polyamide (PA-66) was measured by capillary rheometry at different shear rates, below, near and above the melting point of PA-66, i.e. 240℃, 260℃ and 280℃, respectively. At 260℃ and a high shear rate, ηa of the blend reduced abnormally; and at 260℃, was lower than that at 280℃. The images of etched surface of extrudate observed by the SEM showed different dispersed phase morphology, induced by flow at different temperatures. It is suggested that the formation of fibrillar morphology of dispersed phase is a key factor for the abnormal reduction of ηa for the HDPE/PA blend.
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