Photopatterning
on polymer films has attracted extensive attention
due to its widespread applications. Nevertheless, it is still challenging
to rewrite these patterns. Herein, we demonstrate a viable approach
toward the rewritable polymer films based on topo-polymerization of
the diacetylene monomer (e.g., 10, 12-pentacosadiynoic acid, PCDA)
in poly(propylene carbonate) (i.e., PPC). Rewritability of at least
17 times through the reversible colorimetric change of polydiacetylene
(PDA) is achieved, and the written information can be maintained for
9 months under ambient conditions. Moreover, it is found that the
hydrogen bonding interaction between PCDA and PPC plays a key role
in improving the rewriting performance according to variable temperature
Fourier transform infrared spectroscopy and molecular dynamics simulations.
Well-defined assembly of PCDA along the PPC main chain is enabled,
which leads to improved topo-polymerization of PCDA. The proposed
paradigm here paves the way to design rewritable polymer films with
customized patterning.