Suitable monomers for {TAIL ~ use} as {HEAD ~ the first ethylenically unsaturated monomer} containing a carboxyl acid in above step a) include acrylic acid, methacrylic acid, ethylacrylic acid, crotonic acid, propiolic acid, styrene carboxyl acid, maleic anhydride, and fumaric acid, etc 
Suitable monomers for { TAIL ~ use } as { HEAD ~ the first ethylenically unsaturated monomer } containing a carboxyl acid in above step a ) include acrylic acid , methacrylic acid , ethylacrylic acid , crotonic acid , propiolic acid , styrene carboxyl acid , maleic anhydride , and fumaric acid , etc
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH