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Determination of the glass transition of powder samples using Dynamic Mechanic Analysis on compacts

Mikael Larsson (Institutionen för kemi- och bioteknik, Farmaceutisk teknologi ; SuMo Biomaterials) ; Anette Larsson (Institutionen för kemi- och bioteknik, Farmaceutisk teknologi ; SuMo Biomaterials) ; Mats Stading (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer)
Annual Transactions of the Nordic Rheology Society (1601-4057). Vol. 18 (2010), p. 59-64.
[Artikel, övrig vetenskaplig]

Dynamic Mechanic Analysis, DMA, is a sensitive method to determine the glass transition temperature (Tg) of materials. Several different sample geometries such as three point bending, stretched films or compressed cylinders, are commonly used. The Tg of a powder is related to its “sticky point”, i.e. the temperature when the powder particles interact instead of flowing freely. The determination of powder Tg is not straightforward using DMA due to the limiting geometry. Here it is demonstrated that the Tg of powder samples can be effectively and correctly determined by DMA on compacts in compression mode, using a standard wedge shaped probe usually utilized in three point bend analysis. The analysis of compacts holds the benefits of analysing powder samples as received from manufacturers, being relatively robust with regard to deformation as the material becomes rubbery, and enabling easy sample preparation and handling.



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Denna post skapades 2010-09-20. Senast ändrad 2016-04-04.
CPL Pubid: 126656

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Farmaceutisk teknologi (2005-2014)
SuMo Biomaterials
Institutionen för material- och tillverkningsteknik, Polymera material och kompositer

Ämnesområden

Materialvetenskap
Kemi
Materialteknik
Galenisk farmaci

Chalmers infrastruktur