Organosiloxane, functional groups that

From the above-stated it follows that synthesis of poly-organosiloxane xerogels with a bifunctional surface layer is possible when a use is made of functional groups of various nature. In this case the composition of a surface layer can be varied over a wide range (in our experiments the SH/NH2 ratio was equal to 4 0, 3 1, 2 2, or 1 3). 

In contrast, the synthesis of the initiator functionality and the modification of the poIy(siloxane) is only one single step for TMP using an easily available diazonium compound 2 with a yield of about 60-80 %. Structure verification and determination of the initiator group content could be done by h NMR spectroscopy. GPC analysis showed that the modified poly(organosiloxane)s retain their original molecular weights. About 4-8 initiating sites have been attached onto the silicone backbone. Due to the chromophores, AMP and TMP are yellow products. 

The hydrolysis can be so controlled, that organosiloxanes are produced containing Cl-Si- and RO-Si-groups in addition to HO-Si-groups, which not only react with each other to silicone resins, but also react e.g. with HO-functional poiy(ethers)... 

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