Bottlebrushes were synthesized by ring opening polymerization (ROP) of rac-lactide utilizing a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) catalyst, followed by the ring opening metathesis polymerization (ROMP) of norbornene terminated macromonomer with third generation Grubbs catalyst (see Scheme 1). Boric acid was used as a quenching agent for the ROP catalyst to perform the graft-through process without isolating the macromonomers. Molecular weight of the bottlebrush polymers were determined based on macromonomer to initiator ratio and macromonomer conversion determined by RI-GPC. ); and (iii) side chain sweep, spanning n sc from 5 to 100 at n bb = 200 (see Table ). The spacings between the samples were increased exponentially for each of the above sweeps. Linear poly(5-norbornene-2-(methyl benzoate)) samples with DP ranging from 10 to 1000 were also synthesized via ROMP (see Table ). GPC traces are provided as Supporting Information.