Phosphonic acid‐based amphiphilic diblock copolymers derived from ROMP

Novel amphiphilic phosphonic acid type diblock copolymers were synthesized by ring-opening metathesis polymerization (ROMP). The copolymers were obtained by sequential addition of {4-(3-Methyl-butyl)-10-oxa-4-aza-tricyclo[5.2.1.02,6]dec-8-ene-3,5-dione} to {3,5-Dioxo-10-oxa-4-aza-tricyclo[5.2.1.02,6]dec-8-en-4-ylmethyl)-phosphonic acid diethyl ester}, when adding the second monomer, the first added monomer had been polymerized. Through cleavage of the phosphonate groups via transesterification with trimethylsilylbromide (TMSiBr), subsequently, the hydrolysis of the silylester group by methanol, the polymer was transformed into amphiphilic block copolymers. The influence of the block ratio on the size of micelles was investigated by using dynamic light scattering (DLS). [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.].