The products of the reaction are polymerized by hydrolysis of {HEAD ~ the alkoxysilane groups} to produce {TAIL ~ an organic containing silica network} 
to produce
The products of the reaction are polymerized by hydrolysis of { HEAD ~ the alkoxysilane groups } to produce { TAIL ~ an organic containing silica network }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL