The substructure {HEAD ~ M} may be selected from a substituted or unsubstituted methylene chain, a substituted or unsubstituted oxyalkylene chain, and {TAIL ~ a silicon} containing chain or combination thereof 
selected from
The substructure { HEAD ~ M } may be selected from a substituted or unsubstituted methylene chain , a substituted or unsubstituted oxyalkylene chain , and { TAIL ~ a silicon } containing chain or combination thereof
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH