BS ISO 6721-11:2019 - Plastics. Determination of dynamic mechanical properties. Glass transition temperature

BS ISO 6721-11:2019

Plastics. Determination of dynamic mechanical properties. Glass transition temperature

Status : Current   Published : December 2019



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.

Standard NumberBS ISO 6721-11:2019
TitlePlastics. Determination of dynamic mechanical properties. Glass transition temperature
Publication Date20 December 2019
Normative References(Required to achieve compliance to this standard)ISO 472, ISO 6721-1
Informative References(Provided for Information)ISO 11357-2
ReplacesBS ISO 6721-11:2012
International RelationshipsISO 6721-11:2019
Draft Superseded By18/30370236 DC
DescriptorsDynamic testing, Complex, Shear stress, Rheological properties, Plastics, Rigidity, Angles (geometry), Dynamic viscosity, Plastics and rubber technology, Viscosity, Mechanical properties of materials, Viscosity measurement, Frequencies, Shear strain, Oscillators, Polymers, Strain, Mechanical testing
Title in FrenchPlastiques. Détermination des propriétés mécaniques dynamiques Température de transition vitreuse
ISBN978 0 580 52278 9
File Size1.186 MB

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