Block Copolymer Photo-Grafted Poly(Ethylene Terephthalate) Capillary Pore Membranes Distinctly Switchable by Two Different Stimuli

Geismann, Christian; Tomicki, Falk; Ulbricht, Mathias

doi:10.1080/01496390903212755

Cited by 24 publications

(12 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The p K a value of PAAc was determined to be 4.46. The estimated p K a value of PAAc was close to the literature value (p K a = 4.5) [ 27 , 28 ]. Hereafter, all experiments were performed at pH 3, where PAAc was protonated, unless otherwise noted.…”

Section: Resultssupporting

confidence: 83%

Thermo-Responsive Behavior of Mixed Aqueous Solution of Hydrophilic Polymer with Pendant Phosphorylcholine Group and Poly(Acrylic Acid)

2021

View full text Add to dashboard Cite

A mixed aqueous solution of hydrophilic poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) and poly(acrylic acid) (PAAc) becomes cloudy under acidic conditions at room temperature. The pendant carboxylic acid groups in PAAc form hydrogen bonds with the ester and phosphate groups in PMPC. While the polymers aggregate under acidic conditions, neither one associate under basic conditions because of the deprotonation of the pendant carboxy groups in PAAc. We observed that the interpolymer complex formed from PMPC, and PAAc was dissociated in aqueous solutions with increasing temperature, which is an upper critical solution temperature behavior. With increasing temperature, the molecular motion increased to dissociate the interpolymer complex. The phase transition temperature increased with increasing polymer and salt concentrations, and with decreasing pH.

show abstract

Section: Resultssupporting

confidence: 83%

Thermo-Responsive Behavior of Mixed Aqueous Solution of Hydrophilic Polymer with Pendant Phosphorylcholine Group and Poly(Acrylic Acid)

2021

View full text Add to dashboard Cite

show abstract

“…According to the above first strategy, Ulbricht et al developed symmetric multiple nanochannels responding to pH and temperature stimuli via modifying dual responsive copolymer brushes. 89,90 Most recently, Wang and Jiang et al presented an integrating ionic gate and rectifier within an asymmetric single nanochannel via modifying pH and temperature dual responsive copolymer brushes (Fig. 16A).…”

Section: Ph and Temperature Dual Responsive Single Nanopore/ Nanochannelmentioning

confidence: 99%

Biomimetic smart nanopores and nanochannels

2011

View full text Add to dashboard Cite

Nature provides a huge range of biological materials, just as ion channels, with various smart functions over millions of years of evolution, and which serve as a big source of bio-inspiration for biomimetic materials. In this critical review, a strategy for the design and synthesis of biomimetic smart nanopores and nanochannels is presented and put into context with recent progress in this rapidly growing field from biological, inorganic, organic to composite nanopore and nanochannel materials, which can respond to single/multiple external stimuli, e.g., pH, temperature, light, and so on. This review is intended to utilize a specific responsive behavior for regulating ionic transport properties inside the single nanopore or nanochannel as an example to demonstrate the feasibility of the design strategy, and provide an overview of this fascinating research field (109 references).

show abstract

“…Diffusion experiments confirmed that changes in diffusion rates of dextran molecules (average molecular weight: 4000 g/mol) through surface-functionalized PET TEM were as expected when compared with calculated layer thicknesses deduced from flux measurements. 59 Later, Friebe and Ulbricht 64 functionalized PET TEM (pore diameters: 0.79 and 1.9 mm) with two sequences of surface-grafted block copolymers, polyNIPAAm and polyAA, via SI ATRP from the membrane surface in order to prepare composite membranes responding to two different stimuli (pH and temperature) (Fig. 17).…”

Section: Stimuli-responsive Membranes Porous Membrane Valves and Gatesmentioning

confidence: 99%

“…Fig.17(a) Schematic visualisation of pores grafted sequentially with functional diblock copolymers and their response to changes of pH and temperature; (b) results from hydraulic permeability (left) and dextran diffusion (right) measurements for PET TEM with grafted diblock copolymers obtained using SI ATRP (left; the hydraulic permeability had been multiplied by the respective viscosity in order to allow for a comparison of effective pore size at the two temperatures), and iniferter mediated UV polymerization (right), both with similar degree of functionalization (taken/adapted from ref 59,64)…”

mentioning

confidence: 99%

Composites of functional polymeric hydrogels and porous membranes

et al. 2011

Self Cite

View full text Add to dashboard Cite

Polymeric hydrogels are a most interesting class of ''soft matter'' with several established and many more possible applications as functional materials. In this review we will focus on the combination of polymeric hydrogels and porous membranes which leads to composites with promising functionality for, e.g., mass separations, sensing and analytics, (bio)catalysis, biomedical engineering and microsystem technologies. The combination of a rigid porous membrane with a soft functional hydrogel by a suited preparation technique enables that the functionality of the hydrogel can be applied in a unique way. The most important preparation strategies for hydrogel composite membranes, i.e., pore-filling, various surface-grafting methods and combinations thereof, will be discussed. The structural diversity of the hydrogels is based on the use of a wide range of synthetic monomers, but biopolymers or their derivatives can also be applied. The interplay of the membrane pore structure, the structure of the hydrogel and the distribution of the hydrogel in the pore space can lead to different types of composite membranes with completely different potential applications. The focus will be on promising examples for the various types of functional composite membranes, i.e., macroporous membrane adsorbers, antifouling filtration membranes, hydrogel-based ultrafiltration membranes, other separation membranes with pore-filling hydrogel as selective material, stimuli-responsive membranes and porous membrane valves and gates, as well as biocompatible or bioactive membranes.

show abstract

Block Copolymer Photo-Grafted Poly(Ethylene Terephthalate) Capillary Pore Membranes Distinctly Switchable by Two Different Stimuli

Cited by 24 publications

References 25 publications

Thermo-Responsive Behavior of Mixed Aqueous Solution of Hydrophilic Polymer with Pendant Phosphorylcholine Group and Poly(Acrylic Acid)

Thermo-Responsive Behavior of Mixed Aqueous Solution of Hydrophilic Polymer with Pendant Phosphorylcholine Group and Poly(Acrylic Acid)

Biomimetic smart nanopores and nanochannels

Composites of functional polymeric hydrogels and porous membranes

Contact Info

Product

Resources

About