Smart composite useful to acid release

摘要

This work presents a smart composite prepared using a resin based on cardanol and furfural, filled with Al2O3. This material is inert at room temperature. However, it is able to release an active substance after a certain temperature is reached. The obtained materials were characterized by Fourier transform spectroscopy, X-ray diffraction, scanning electron microscopy, thermal gravimetric analysis, and differential scanning calorimetry. In addition, cure degree and acid-release tests were performed. According to the obtained data, acid is trapped inside the composites, remaining inactive in the structure while the melting temperature of the hydrophobic shell is not reached. After it is, acid is released and the pH decreases. Therefore, this smart composite could be useful in speeding up drilling in sedimentary rocks with a combination of chemical (acid release) and physical (mechanical wear) mechanisms. (C) 2015 Wiley Periodicals, Inc.