Polymeric hollow nanospheres with stabilized structure have been realized by self-assembly of crosslinkable rigid poly(amic acid) ester (PAE) oligomer and coil-like poly(4-vinylpyridine) (PVPy) via hydrogen bonding in their common solvent and subsequent photo-crosslinking of the PAE.
Kuang, M., Duan, H., Wang, J., Chen, D., & Jiang, M. (2003). A novel approach to polymeric hollow nanospheres with stabilized structure. Chemical Communications, 3(4), 496–497. https://doi.org/10.1039/b210851h