Abstract

Only 3phr of octosilicate (OCTO), swollen with cetyltrimethylammonium ions (CTA), used as an additive in a rubber tire tread compound (80phr of highly dispersible silica, HDS) improves the end properties. The presence of the organo-modified synthetic layered silicate increases vulcanization rate, while the analogue natural silicate, montmorillonite, did not show the same effects.[1-3] The reinforcing filler network is modified as a result of the incorporation of the SLS, therefore, the values of fractal exponents which characterize the reinforcing filler network were found to be different when comparing sillica-only compounds to silica/SLS compounds.[4] The substitution of CTA ions by dimethyldioctadecylammonium ions (2HT) increases the interlaminar space (from 2.7nm to 4.3nm), improving the exfoliation of octosilicate. Therefore, mechanical effects similar to those of OCTO-CTA can be obtained with lower OCTO-2HT concentration. Nevertheless, as a result of the change in the organic modifier and concentration levels, variations of the mixing process have also been necessary in order to obtain comparable results.[5] Systematic studies of our research will be expounded and discussed in this publication.

Abstract

In this work, different type of surface treatments on aluminium films have been performed. The changes that these treatments produce in the nature, composition, functionality, morphology and free surface energy on the aluminium surfaces will be analyzed. First treatment has been performed in two steps, the first one consists on activating the aluminium surface with sodium metoxyde in methanol and the time and treatment conditions on the nature of the formed surface will be studied. The second treatment has been performed in three steps, so between the activation step and the sylanization, an intermediate treatment has been done in order to try to insert a polymer by "in situ" polymerization on the aluminium surface. Those treated aluminium film surfaces have been characterized using infrared spectroscopy by Fourier transform (FTIR), contact angle measurement, surface energy determination and Dynamic Mechanic Thermal Analysis (DMTA).