title: Photochemical control of microphase structure in biocompatible polyester membranes generated by ultraviolet irradiation.
abstract: The morphologies of PEMA-RB/PHEMA semi-interpenetrating polymeric network (semi-IPN) blended membranes prepared via ultraviolet (UV) promoted in situ photopolymerization were investigated using laser scanning confocal fluorescence microscopy (LSCFM). The results show that the semi-IPN morphology generated through UV light irradiation-induced microphase separation is considerably dependent on the relative rates of the photochemical reaction and microphase separation in the reactive precursor mixtures, which are determined by reactive dynamic factors. Changing the dynamic conditions, such as the UV light intensity, content of cross-linker and concentration of HEMA photopolymerization monomer resulted in a corresponding alteration of the morphological structure in the semi-IPN membranes. The hierarchical morphology appearing in the PEMA-RB/PHEMA semi-IPN should be related to the inhomogeneous photoreaction dynamics of the mixed system. Desired morphologies of the semi-IPN blend membranes can be obtained by controlling the corresponding dynamic conditions of both the photochemical reaction and microphase separation.
authors.affiliation: Department of Biological and Environmental Engineering, Hefei University, Hefei, Anhui 230022, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.forename: Wenmin
authors.initials: W
authors.lastname: Pang
authors.forename: Liming
authors.initials: L
authors.lastname: Tian
authors.forename: Kangming
authors.initials: K
authors.lastname: Nie
mesh_terms: D001672:Biocompatible Materials; D008567:Membranes, Artificial; D008856:Microscopy, Fluorescence; D011091:Polyesters / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D001672:Biocompatible Materials; D008567:Membranes, Artificial; D011091:Polyesters