BS ISO 6721-11:2019 pdf free.Plastics一Determination of dynamic mechanical properties.Glass transition temperature.
BS ISO 6721-11 This document specifies methods for determining a value of the glass transition temperature (Tg) from the dynamic mechanical properties measured during a linear temperature scan under heating conditions. The glass transition temperature is an indicator of the transition from a hard and relatively brittle glassy state to a rubbery or viscous liquid state in an amorphous polymer or in amorphous regions of a partially crystalline polymer. Usually referred to as dynamic mechanical analysis (DMA]， the methods and their associated procedures can be applied to unreinforced and filled polymers, foams, rubbers, adhesives and fibre- reinforced plastics/composites. The methods are limited to materials that are inherently stable above Tg, i.e. amorphous materials that transform into a rubbery state or partially crystalline materials that keep their shape due to crystallinity. Different modes [e.g. flexure, torsion, shear, compression, tension) of dynamic mechanical analysis can be applied, as appropriate, to the form of the source material. Measured Tg values using instrumentation can vary as a result of material characteristics and/or the test set-up. The temperature sensor in a DMA instrument is not in contact with the test specimen and therefore measures temperature of the environment surrounding the specimen under test. The resulting data can vary with the heating rate applied. A procedure is included to take into account the thermal lag influencing the measured data.A specimen of known geometry is placed or held in a suitable mechanical loading system in an enclosed temperature chamber, or oven, which can be heated at a controlled rate. The specimen is mechanically oscillated at a fixed frequency, and the resulting changes in the viscoelastic response of the material are monitored and recorded as a function of the test temperature. The dynamic properties (storage modulus, loss modulus and loss factor) are determined from the load and displacement data recorded throughout the test (see ISO 6721-1). BS ISO 6721-11 pdf download.