Micro-combustion calorimetry (MCC) :

First, let's see what Micro-combustion calorimetry (MCC) is: also known as pyrolytic combustion flow calorimetry (PCFC), which USES traditional oxygen consumption principles in microcalorimetry.

The sample is placed in the decomposition furnace and added at a certain heating rate (typically 1-5k /s). The decomposition product is brought out of the decomposition furnace through the inert gas. After mixing with oxygen, it is sprayed into the combustion chamber at 900 degrees Celsius. The oxygen loss during combustion can be determined by the oxygen concentration and the flow rate of the combustion gas.

Advantages of Micro-combustion calorimetry:

The advantage of microcalorimetry is that it is not affected by processing, and it can check the material and component samples before processing, so as to infer the influence of processing. A small amount of plastic (2-3mg) is heated in front of an inert gas (e.g., nitrogen) by a heating coil that surrounds the test chamber.

After heating and nitrogen supply is interrupted, the external igniter ignites the released combustible gas and supplies oxygen. Heat release is determined by oxygen consumption. During the test, the heat released per unit of substance and the corresponding sample temperature are marked.

Characteristic values of flame and non-flame retardant PC+ABS mixtures tested. Can be seen from the diagram, flame retardant mixture quality changes corresponding to the temperature change of the biggest led about 95 K (from around 445 ° C to 540 ° C). The heat release rate of the flame retardant mixture decreased by about 130W/g on average. The scattering (peak difference) of the heat release rate of PC+ABS is 80W/g, although the heat release rate is significantly reduced, the same flame retardant mixture is 10W/g higher. The reason for the large scattering is the uneven distribution of additives in the granule.

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