The self assembly between diazoresin(DR) and the homopolymer or copolymers of 4 N hydroxyphenyl acrylamide(NHPA) has been investigated.It was confirmed that the driven force of the assembly is H bonding attraction, in which the DR plays a role of H acceptor, while the NHPA polymers act as a H donor, Under UV, the multiayer films become very stable towards polar solvents. For example, no any change was observed when the irradiated film was immersed in DMF at 20 ℃ for 12 h, but the unirradiated film was destroyled completely when it was immersed in DMF at the same temperature for 20 min. The dramatically improvement for the stability of the film towards polar solvents should be attributed to the bond conversion of the layers from H bond to covalent bond under UV irradiation.
Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to form PVPh.A kind of stable multilayer utra thin film was successfully fabricated via self assembly technique from PVPh and diazoresin (DR) followed by UV irradiation.The driving force of self assembly was confirmed to be the hydrogen bonding attraction from diazonium group(—N + 2)of DR and phenolic hydroxy group(—Ph—OH)of PVPh.The film becomes very stable towards polar solvents after UV irradiation and it is believed that the H bonds between the layers of the film converts to covalent bonds following the decomposition of —N + 2 groups when the multilayer film underwent UV irradiation.
