  We design and synthesize unentangled associative polymers carrying
unprecedented high fractions of stickers, up to eight per Kuhn segment, that
can form strong pairwise hydrogen bonding of $\sim20k_BT$ without microphase
separation. The reversible bonds significantly slow down the polymer dynamics
but nearly do not change the shape of linear viscoelastic spectra. Moreover,
the structural relaxation time of associative polymers increases exponentially
with the fraction of stickers and exhibits a universal yet non-Arrhenius
dependence on the distance from polymer glass transition temperature. These
results cannot be understood within the framework of the classic sticky-Rouse
model but are rationalized by a renormalized Rouse model, which highlights an
unexpected influence of reversible bonds on the structural relaxation rather
than the shape of viscoelastic spectra for associative polymers with high
concentrations of stickers.
