Thickness direction thermomechanical

Table I gives the summary of CTE measurements made on neat and filled XYDAR molded parts. These CTE measurements were performed in a temperature range from 0-150 °C using a DuPont 942 thermomechanical analyzer (TMA). The CTE s shown in Table I are measured in the flow, transverse, and thickness directions for the formulation and part geometry specified. In a part of center-gated geometry, the radial direction is the flow direction and the circumferential direction is the width direction. All of the TMA testing was performed on aB-molded samples (no annealing).

In the present investigation we are particularly interested in the thermomechanical response characteristics of the specimens under conditions of uniform through-the-thickness heat flow. Thus, the uniformity of surface heating is quite important. Figure 3 shows an example of the observed radial temperature distributions over the upper specimen surface upon heating. While the temperature gradually decreases from the center to the periphery of the specimen, the maximum temperature differential AT in the radial direction is small in comparison with the temperature at the center. For instance, =<0.11 and 0.03 after heating for 5 s... 

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