and {TAIL ~ 0.94 wt %} of {HEAD ~ ˜}, mercaptopropyltrimethoxysilane 
and { TAIL ~ 0.94 wt % } of { HEAD ~ ˜ } , mercaptopropyltrimethoxysilane
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH