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Ageing of two petroleum waxes

Maria Petersson (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Ingrid Gustafson ; Mats Stading (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer)
Journal of Materials Science (0022-2461). Vol. 43 (2008), p. 1859-1868.
[Artikel, refereegranskad vetenskaplig]

The effect of ageing at different storage conditions on the microstructure and melting properties of two petroleum waxes, petrolatum and microcrystalline wax, were investigated. The two waxes were stored for a maximum of 50 weeks at different temperatures. Samples were analysed before storage and removed from storage and analysed after different storage times. The effect of storage time and temperature was analysed with confocal laser scanning microscopy and modulated differential scanning calorimetry. Some alteration in the microstructure occurred with longer storage time. The amount of fine and irregular structures seen in the initial petrolatum samples decreased with storage time, and some shadowy, grey areas appeared. The microstructure of the microcrystalline wax stored at 23 °C became more diffuse and more, shadowy, grey areas appeared with time compared to samples stored at 50 °C. These showed coarser crystalline structures and fewer shadowy, grey areas. The results of confocal laser scanning microscopy and modulated differential scanning calorimetry analyses indicated that recrystallization occurred in both waxes during storage. The proposed recrystallization processes taking place during storage were most likely the same in all samples, but the recrystallization occurred to a greater extent in the microcrystalline wax samples stored at 50 °C.



Denna post skapades 2008-03-11. Senast ändrad 2016-10-25.
CPL Pubid: 69080

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Polymera material och kompositer (2005-2017)

Ämnesområden

Materialteknik
Funktionella material

Chalmers infrastruktur