  We study the structural and dynamical behaviors of a diblock copolymer chain
in a bath of active Brownian particles (ABPs) by extensive Brownian dynamics
simulation in a two-dimensional model system. Specifically, the A block of
chain is self-attractive, while the B block is self-repulsive. We find, beyond
a threshold, the A block unfolds with a pattern like extracting a woolen string
from a ball. The critical force decreases with the increase of the B block
length,NB, for short cases, then keeps a constant with further increase of NB.
In addition, we find a power law exists between the unfolding time of chain and
active force, Fa, as well as NB. Finally, we focus on the translational and
rotational diffusion of chain, and find that both of them remain
supper-diffusive at the long time limit for small active forces due to an
asymmetry distribution of ABPs. Our results open new routes for manipulating
polymer's behaviors with ABPs.
