Microbial growth enhancement from a dry film additive

A hyperbranched polymer used to enhance bacterial growth atop a substrate, wherein the hyperbranched polymer contains one or more repeating units of the following structure:

• wherein each R individually represents either RA or RB;
• wherein RA is a bond to another repeating unit and RB represents the fractional functionalization of the hyperbranched polymer by a plurality of functional groups, wherein the plurality of functional groups comprise:
• a first functional group comprising a C6-C30 alkyl chain attached to the repeating unit through a carbonyl group (C═O) via an ester linkage,
• a second functional group comprising a partially fluorinated or perfluorinated C6-C20 alkyl chain attached to the repeating unit through a carbonyl group (C═O) via an ester linkage, and
• a third functional group comprising substantially one of:
• (a) a stabilized radical source attached to the repeating unit via a C0-C20 tether, wherein the stabilized radical source is a 5 or 6 member heterocycle of carbon and nitrogen, which may be substituted with alkyl groups α(alpha) to the stabilized radical that sterically stabilizes an oxygen free radical, or (b) a 5 to 8 member chloroamide heterocycle of carbon and nitrogen that is attached to the repeating unit via a C2-C6 tether;
• and wherein RA and RB are each resent in the hyperbranched polymer.