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Solvent stable polymeric membranes with morphologies ranging from highly porous to dense were prepared via UV curing using dedicatedly designed photopolymerizable compositions. To optimize the UV curing efficiency, various parameters including the photoinitiator type, cross-linker functionality, as well as membrane thickness were investigated. UV modified polysulfone membranes showed excellent solvent stability in addition to a 91% Rose Bengal (1017 Da) retention at a superior ethyl acetate permeance of 8 l m(-2) h(-1) bar(-1) in a typical solvent resistant nanofiltration (SRNF) experiment.

A new class of hyperbranched PPIs and PPCs have been prepared. The introduction of compatibilizing groups such as MEEA or trimethylacetate enhanced their solubility in radiation‐curable formulations and led to an improved photoactivity compared with the corresponding MPI and MPC. Although the molecular weights of the subject PPIs and PPCs exceeded 800 g · mol−1, the viscosities of the radiation‐curable formulations were still suitable for inkjet application. The combination of high photoactivity, low viscosity, and low extractability after curing rendered the resulting hyperbranched PPIs and PPCs attractive as components in the inkjet ink for inkjet printing, e.g., in food packaging.magnified image

A new class of hyperbranched polymeric photoinitiators with built-in amine coinitiators has been developed, showing high functionality, low viscosity, good compatibility with the usual radiation curable formulations, high photoactivity and low extractability from the cured sample.

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