Advantages of fast Thermal Analysis for polymer characterization

摘要

Fast measurements were performed using commercial DSC and DMA instruments. Therninfluence of the heating rate on the DSC curve was investigated taking amorphousrnPoly(ethylene-terephthalate) as an example. At heating rates below 200 K/min re-crystallizationrneffects during the measurements occur. The initial crystallinity can be measured at higher rates.rnIt is shown, that such measurements can be performed in a DSC822~e using sample robot andrncommercial available crucibles. A procedure is proposed for determination of the minimumrnheating rate at which the DSC curve is not influenced by re-crystallization.rnAdvantages of fast DMA are high sample throughput and the ability of using low samplernsizes in mechanical analysis. Beside the fast measurements also a fast and comfortable samplernpreparation improves the throughput-rate of the instrument. For high heating rates also a highrnfrequency is required to have enough data-points during transitions. The mechanical behavior ofrnPoly(ethylene-terephthalate) from the glassy state into the melt was measured in approximatelyrn15 min including sample preparation using a DMA/SDTA861~e.