Self-assembly of an interacting binary blend of diblock copolymers in thin films: a potential route to porous materials with reactive nanochannel chemistry

Rao, Jingyi; Ma, Huan; Baettig, Julia; Woo, Sanghoon; Stuparu, Mihaiela C.; Bang, Joona; Khan, Arijit

doi:10.1039/c4sm01029a

Cited by 19 publications

(19 citation statements)

References 91 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the preparation of quaternary pyridinium salts in pores lined with polymer segments or the formation of pores lined with carboxylate groups after the hydrolysis of dimethylacrylamide groups. 24,25 It is known that LC based nanoporous materials can selectively adsorb small molecules; 2,13,26 however, covalent pore surface functionalization has not been reported yet for LC based nanoporous networks and would constitute a distinct step forward in the development of functional nanoporous polymers based on LCs because it creates a handle in the pore facilitating modification of the chemical environment of the pore lining. We expect that this additional functionality will provide crucial tunability of LC based nanoporous films for specific applications.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Pore Size and Chemical Interior of near 1 nm Sized Pores in a Nanoporous Polymer Based on a Discotic Liquid Crystal

Bhattacharjee

Lugger

2017

Macromolecules

View full text Add to dashboard Cite

A triazine based disc shaped molecule with two hydrolyzable units, imine and ester groups, was polymerized via acyclic diene metathesis in the columnar hexagonal (Colhex) LC phase. Fabrication of a cationic nanoporous polymer (pore diameter ∼1.3 nm) lined with ammonium groups at the pore surface was achieved by hydrolysis of the imine linkage. Size selective aldehyde uptake by the cationic porous polymer was demonstrated. The anilinium groups in the pores were converted to azide as well as phenyl groups by further chemical treatment, leading to porous polymers with neutral functional groups in the pores. The pores were enlarged by further hydrolysis of the ester groups to create ∼2.6 nm pores lined with −COONa surface groups. The same pores could be obtained in a single step without first hydrolyzing the imine linkage. XRD studies demonstrated that the Colhex order of the monomer was preserved after polymerization as well as in both the nanoporous polymers. The porous anionic polymer lined with −COOH groups was further converted to the −COOLi, −COONa, −COOK, −COOCs, and −COONH4 salts. The porous polymer lined with −COONa groups selectively adsorbs a cationic dye, methylene blue, over an anionic dye.

show abstract

Section: Introductionmentioning

confidence: 99%

Tailoring Pore Size and Chemical Interior of near 1 nm Sized Pores in a Nanoporous Polymer Based on a Discotic Liquid Crystal

Bhattacharjee

Lugger

2017

Macromolecules

View full text Add to dashboard Cite

show abstract

“…10 In these techniques, polymeric sheets with outstanding mechanical properties could be obtained, where the incorporation of metallic 11 or semiconductor nano-components imparted additional conductive and/or optical properties to the materials. 15,16 These drawbacks can potentially be overcome by applying surface-initiated polymerization (SIP) methods for the synthesis of polymeric films with precisely tunable thickness. Porous polymeric membranes of sub-100 nm thickness have great potential in membrane technology, for instance in drug delivery or to compartmentalize (bio)chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin, freestanding, stimuli-responsive, porous membranes from polymer hydrogel-brushes

et al. 2015

View full text Add to dashboard Cite

The fabrication of freestanding, sub-100 nm-thick, pH-responsive hydrogel membranes with controlled nano-morphology, based on modified poly(hydroxyethyl methacrylate) (PHEMA) is presented. Polymer hydrogel-brush films were first synthesized by surface-initiated atom transfer radical polymerization (SI-ATRP) and subsequently detached from silicon substrates by UV-induced photo-cleavage of a specially designed linker within the initiator groups. The detachment was also assisted by pH-induced osmotic forces generated within the films in the swollen state. The mechanical properties and morphology of the freestanding films were studied by atomic force microscopy (AFM). Inclusion of nanopores of controlled diameter was accomplished by performing SI-ATRP from initiator-coated surfaces that had previously been patterned with polystyrene nanoparticles. Assembly parameters and particle sizes could be varied, in order to fabricate nanoporous hydrogel-brush membranes with tunable pore coverage and characteristics. Additionally, due to the presence of weak polyacid functions within the hydrogel, the membranes exhibited pH-dependent thickness in water and reversible opening/closing of the pores.

show abstract

“…The membranes (both the PS4VP single‐layer membrane and the dual‐layer PS4VP–PVDF membrane) were put into a methanol (15 mL)–MeI (2 mL) bath and shaken at room temperature for a certain time; they were then washed with methanol and water three times each . This treatment resulted in the quaternization of the pyridine nitrogen of the P4VP polymer block.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of dual‐layer poly(styrene‐b‐4‐vinyl pyridine)–poly(vinylidene fluoride) membranes with tailored pore sizes under 10 nm via surface quaternization

Liu²,

Liu

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

Block copolymer membranes can be applied to precise size-based separation because of their highly ordered surface morphology and adjustable pore sizes. However, there is a lower limit of the scale of block copolymer self-assembly; this makes it a challenge to tailor the pore size down to below 10 nm. In this study, poly(styrene-b-4-vinyl pyridine) membranes were modified to quaternized selective layers with pores smaller than 10 nm and were supported by poly(vinylidene fluoride) hollow fibers as the substrate to provide a high mechanical strength. Two reactants, methyl iodide and 2-chloroacetamide, were used in the quaternization. With this one-step chemical modification, the molecular weight cutoff was reduced from 190 to 8 kDa, and the surface pore sizes were narrowed down from 20-30 to 3 nm; this bridged the gap of tailored pore sizes down to below 10 nm. Such membranes are promising candidates for low-molecular-weight separation with high resolution.

show abstract

Self-assembly of an interacting binary blend of diblock copolymers in thin films: a potential route to porous materials with reactive nanochannel chemistry

Cited by 19 publications

References 91 publications

Tailoring Pore Size and Chemical Interior of near 1 nm Sized Pores in a Nanoporous Polymer Based on a Discotic Liquid Crystal

Tailoring Pore Size and Chemical Interior of near 1 nm Sized Pores in a Nanoporous Polymer Based on a Discotic Liquid Crystal

Ultrathin, freestanding, stimuli-responsive, porous membranes from polymer hydrogel-brushes

Fabrication of dual‐layer poly(styrene‐b‐4‐vinyl pyridine)–poly(vinylidene fluoride) membranes with tailored pore sizes under 10 nm via surface quaternization

Contact Info

Product

Resources

About