Characterization of Calcium Carbonate Whiskers after Modification

2 Characterization of Calcium Carbonate Whiskers after Modification 

When the concentration of the modifier increases to 4.5%, the activation index of the whiskers reaches a maximum of 91.0%. When the concentration is greater than 4.5%, the activation index scarcely changes. Overall, the activation index is hardly increased when the concentration of the surface modification agent reaches 3.0%. 

The effect of different processing time for a modification effect of calcium carbonate whiskers is shown in Table 5.1. 

As shown in Table 5.1, different modification times have different effects on whiskers. The activation index of calcium carbonate whiskers approach a maximum of 93.4% when the processing time is 50 minutes. With an increase of processing time, more modifier molecules are adsorbed on the surface of the whiskers, and the effect of the modification increases gradually. When the processing time is up to 50 minutes, the modification agent can make sufficient contact with the whiskers and fully coat their surface to the maximum activation index. When the modification time extends further, the already adsorbed modification agent on the material surface desorbs, and the modification effect deteriorates. 

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