Facile Fabrication of CO₂-Responsive Nanofibers from Photo-Cross-Linked Poly(pentafluorophenyl acrylate) Nanofibers

Abstract

CO2-responsive nanofibers were facilely prepared from photo-cross-linked poly­(pentafluorophenyl acrylate) (PPFPA) nanofibers via “amine-active ester” chemical modification. Photo-cross-linked PPFPA nanofibers were modified with histamine under mild conditions to generate cross-linked poly­(histamine acrylamide) (PHAAA) nanofibers featuring a CO2 responsiveness. As expected, the prepared cross-linked PHAAA nanofibers can exhibit a CO2-responsive behavior to induce a reversible transition from hydrophobic to hydrophilic upon alternating addition and removal of CO2 on the surface of nanofibrous membranes. Based on this finding, we could demonstrate that cross-linked PHAAA nanofibers can be employed for reversible absorption and release of protein using bovine serum albumin (BSA) as a model.

A Bioinspired Hierarchical Underwater Superoleophobic Surface with Reversible pH Response

“…Upon post‐polymerization modification, the bands resulted from PPFPA decreased significantly, while a new carbonyl stretching band at 1724 cm −1 (marked in red), relevant to the newly formed PMAA brush, increased over time. [ 61 ] After 36 h, the post‐polymerization modification reached an end, as the intensity of the bands remained constant even for a prolonged reaction time of 48 h. Nevertheless, the carbonyl stretching vibrations of PFP ester remained with lower intensity even after a 36 h reaction period, attributing to the crosslinked structure of micropillars, which hindered quantitative conversion of amino end‐functionalized polymer chains inside the pillars. Notably, it is the surface that has a prominent effect on targeted superoleophobicity and oil‐adhesion properties.…”

UV‐triggered CO2‐responsive behavior of nanofibers and their controlled drug release properties

“…Azobisisobutyronitrile (98.0%, Alfa, China) was twice recrystallized from methanol. N , N ‐dimethyl‐ N ‐(2‐nitrobenzyl)‐ethane‐1,2‐diamine (DMNOBA) (Figure S1), pentafluorophenyl acrylate (PFPA), and 4‐acryloyloxy benzophenone (ABP) were prepared according to previously published reports.…”

Recent Advances in Stimuli‐Responsive Commodity Polymers

“…Examples of molecular entities incorporated into these polymers and responsible for stimuli‐responsive characteristics are summarized in Figure . Due to technological importance of particular interest are responses to pH, [ 1–5 ] temperature, [ 6–14 ] H 2 O, [ 15–21 ] redox agents, [ 22–28 ] CO 2 , [ 29–34 ] glucose, [ 35 ] enzyme, [ 36–38 ] electric [ 39 ] and/or magnetic field, [ 40–42 ] electromagnetic radiation, [ 43,44 ] and mechanical forces [ 45–48 ] which are discussed in this review.…”

“…Hexameric tyrosine‐coordinated heme protein (HTHP); surface modification of HTHP by PNIPAM occurs at V44 residue as reaction site (PNIPAM‐HTHP V44C ); Zn protoporphyrin IX (ZnPP); apo form of HTHP V44C (apoHTHP V44C ); ( n /6) where n stands for the number of ZnPP in HTHP with six heme pockets (Adapted with permission [ 53 ] Copyright 2020, American Chemical Society); C) Schematic representation of preparation of photo‐crosslinked PPFPA nanofibers with histamine by post‐electrospinning modification. The resulting cross‐linked PHAAA nanofibers facilitates reversible absorption‐release cycle of BSA upon CO 2 stimulation (Adapted with permission [ 31 ] Copyright 2018, American Chemical Society).…”