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March 3, 2005Section 12, R&D Division 1A&D Company, LimitedM Measuring the Moisture Content of PBT Pellets with the MS70 Polybutylene terephthalate, abbreviated PBT, is a straight-chain thermoplastic polyester that has an ester linkage in its main chain. PBT is a polymeric resin that belongs to the same family as PET.1.Determining the Sample Quantity As the moisture content of the PBT used for the present report was less than 0.1%, the sample mass was set to 20g in accordance with Section 5.3.1 of the instruction manual, “Necessary Mass for Measurements.”Estimated Moisture ContentNecessary Mass for Measurement1%->At least 2g0.5%->At least 5g0.1%->At least 20g(Note: The larger the error of measurement the smaller the sample quantity)2.Determining the Drying Temperature The optimal drying temperature was determined using the RsTemp function of the standard software WinCT-Moisture. In general, the moisture content of a resin material is small and difficult to volatilize. Therefore, the graph curve is slow to stabilize and it is hard to judge whether water or another constituent is vaporizing.The graph below appears to stabilize at 180 C. However, a slight odor was generated and the sample started to melt at around 200 C. Consequently, based on overall considerations, 160 C was chosen as the drying temperature.
