Plastics. Determination of dynamic mechanical properties. Glass transition temperature
83.080.01 - Plastics in general
Reemplaza a: BS ISO 6721-11:2012
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.
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