Comparing thermal resistivity between semi-crystalline and amorphous polymers
- Author Carles M. Rubio
- Co-Author Lorena Rodríguez
- DOI
- Country : Spain
- Subject : polymers science
Keywords : thermal properties, crystallinity, amorphous, thermal diffusivity, thermal conductivity
Abstract
The aim of this work is to determine the heat transfer in semicrystalline and amorphous polymers. The method is based on ASTM 5334 using a dual needle sensor. The thermal resistivity will be determined due to its reliability in the used technique. The polymers studied were polycarbonate, polypropylene and polyoxymethylene. The obtained results indicated that the semicrystalline polymers have a lower thermal resistivity than the amorphous polymers. Essentially, it was because of the vibrations of the phonons and distance between energy atomic levels. The efficiency was larger in semi-crystalline lattice, especially for polymers which had few attached side functional groups. Other important factors contributing to improved heat transfer were the amount of material around the sensor and the orientation of the flow when the polymer is flowing during extrusion process. Eventually, the method was found efficient and robust, and contributed to increase in depth the knowledge of polymers in this field of research.
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