Effects of high cooling rates on solidification for nucleated and non-nucleated semi-crystalline thermoplastics
During polymer processing the polymer melt usually undergoes a rapid cooling. This affects the solidification of the material, especially the crystallization behaviour. This paper investigates the solidification of semi-crystalline thermoplastic polymers at varied cooling conditions with respect to the presence of nucleating agents to analytically evaluate the application potential for micro injection moulding. For this a high speed DSC is used with cooling rates up to 2000 K s-1 . The investigations reveal that increased cooling rates shift the crystallization temperatures to lower temperatures. Especially for slow crystallizing PA 66 sufficient high cooling rates suppress the crystallization of the melt. A nucleation of the material favours the crystallization as it takes place at already higher temperatures as well as at high cooling rates which are evident for micro injection moulding processes.
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