For a polymer supported metal catalysts, what will be the difference of their TGA analysis from PS support???
Well, you can expect to see the decomposition of the polymer phase in addtion to the thermal transitions of the catalys itself. Differences in the TGA curves between pure polymer, pure catalyst and polymer supported catalys may tell you something about the interactions. It is highly probabl that the presence of catalyst will chenge the decomposition of the polymer too.
Dear all, the Bulky side groups in polymers is the main reason behind their high Tg's. In the case of PS it is arround 100C because of the presence of the benzene ring which hinder the free and ease of localized segmental rotations. So, any increase in the size of the ring will contribute more to the hindrance of this type of mouvement leading to the increase in Tg. My Regards
Dear Vasu... The thermogram of individual components highly depends on the temperature range employed. Catalysts are usually prepared by calcination at relatively high temperature and thus the TG may give no appreciable changes below say 750 C. The PS is an organic material and most features of the decomposition may occur below 450 C. For PS-Catalyst, the TG will show the lowering in the decomposition temperature due to the possible interaction with the catalyst. By the way Abdelkader (above) is talking about the glass transition point, Tg, which has nothing to do with TG (Thermogravimetry). Regards
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