The flow behavior of poly (butylene‐terephthalate) (PBT) has been investigated using a capillary extrusion rheometer. The behavior was measured as a function of temperature, moisture content, and residence time of the molten polymer in the rheometer barrel. The temperature and moisture dependence of PBT are compared with polycarbonate. The notched Izod impact strength of injection‐molded PBT is also reported as a function of moisture content and residence time at processing temperatures.
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Michael P. Van Der Wielen (1975) studied this question.
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