Synthesis and characterization of thermoresponsive ZIF-8@PNIPAm- co -MAA microgel composites with enhanced performance as an adsorption/release platform

MOYA, SERGIO E.; ALLEGRETTO, JUAN A.; AZZARONI, OMAR; GIUSSI, JUAN M.; RAFTI, MATIAS

RSC Advances

RSC

Lugar: Londres; Año: 2019 vol. 10 p. 2453 - 2461

Composite materials featuring a synergic combination of interesting properties such as stimuli responsiveness and tailoredporosity are highly appealing due to its multiple possible applications. We hereby present an example which brings togethersuch features by using poly(N-isopropyl-acrylamide)-derived thermo-responsive microgels and Zn-based Metal OrganicFramework (MOF) ZIF-8, capable of selective adsorption. Such composite was obtained by including methacrylic acid as comonomer in the microgel, in order to position carboxylic acid moieties within the polymeric matrix, which viapreconcentration of MOF precursors would trigger confined heterogeneous nucleation. The highly integrated compositeobtained features thermoresponsivity and permanent porosity. Methylene blue adsorption/desorption experiments wereperformed, revealing a dramatic enhancement of its cargo capacity together with an also increased release efficiency.