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- W2079658932 abstract "universal applicability of the rheological method have already been expressed 2, since the standard curve depends on shear history, time and temperature. In order for the technique to be a useful one it must obviously be applicable to processed samples. Figure 4 shows d.s.c. traces obtained for Compound 1 samples blended under different conditions and extruded using a Leistritz LS-3034 twin screw extruder. It is noted that endotherms A and B are again discernible. (The peak near 100°C is one which develops on room temperature storage of rigid PVC, due to a slow reduction in free volumeT). All samples were extruded using the same conditions and it is apparent that peak B is at a similar temperature in all cases, and about 20°C above the temperature at the die (183°C). It appears therefore that the position of peak B provides information about the maximum temperature to which the polymer has been subjected. Figure 5 shows how this temperature increases with processing temperature for the two compounds studied. The area of endotherm A appears to be related to the level of fusion. The nature of the endotherm is not yet fully understood, but it is possible that it is due to the formation of imperfect ordered regions which are produced as a continuous PVC network develops, and which subsequently melt on reheating. Further work is being carried out to investigate the changes occuring in the compounds, and the value of this thermal analysis technique in assessing fusion levels." @default.
- W2079658932 created "2016-06-24" @default.
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- W2079658932 date "1981-08-01" @default.
- W2079658932 modified "2023-09-26" @default.
- W2079658932 title "A procedure for rapid conditioning of hygroscopic test pieces by humidity cycling" @default.
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- W2079658932 doi "https://doi.org/10.1016/0032-3861(81)90306-2" @default.
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