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