Facile synthesis of cauliflower-like hydrophobically modified polyacrylamide nanospheres by aerosol-photopolymerization

Shaban, Masoom; Ramazani, Ahmad; Ahadian, Mohammad Mahdi; Tamsilian, Yousef; Weber, Alfred P.

doi:10.1016/j.eurpolymj.2016.08.022

Cited by 20 publications

(7 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The onset mass loss of as-electrospun PAAm observed in this temperature range (from 50 to 180 °C) on the TGA curve was consistent with the volatilization of water, and the characteristic thermal gravimetric of pure PAAm fibers possessed three different stages in the upper 200 °C as reported in the literature. 52,53 And the incorporation of PNTs-1 colloidal spheres decreased the initial decomposition temperature of the last stage, which was due to the fracture of an ester bond in the PNTs-1 molecular structure. The glass transition temperature (T g ) of pure PAAm fibers was 182.0 °C (see Supporting Information Figure S5).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Structural Evolution and Formation Mechanism of the Soft Colloidal Arrays in the Core of PAAm Nanofibers by Electrospun Packing

Zhang

Gao

et al. 2017

Langmuir

View full text Add to dashboard Cite

Electrospinning provides a facile and versatile method for generating nanofibers from a large variety of starting materials, including polymers, ceramic, composites, and micro-/nanocolloids. In particular, incorporating functional nanoparticles (NPs) with polymeric materials endows the electrospun fibers/sheets with novel or better performance. This work evaluates the spinnability of polyacrylamide (PAAm) solution containing thermoresponsive poly(N-isopropylacrylamide-co-tert-butyl acrylate) microgel nanospheres (PNTs) prepared by colloid electrospinning. In the presence of a suitable weight ratio (1:4) of PAAm and PNTs, the in-fiber arrangements of PNTs-electrospun fibers will evolve into chain-like arrays and beads-on-string structures by confining of PAAm nanofibers, and then the free amide groups of PAAm can bind amide moieties on the surfaces of PNTs, resulting in the assembling of PNTs in the cores of PAAm fibers. The present work serves as a reference in the fabrication of novel thermoresponsive hybrid fibers involving functional nanospheres via electrospun packing. The prepared nanofibers with chain-like and thermoresponsive colloid arrays in the cores are expected to have potential application in various fields.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Structural Evolution and Formation Mechanism of the Soft Colloidal Arrays in the Core of PAAm Nanofibers by Electrospun Packing

Zhang

Gao

et al. 2017

Langmuir

View full text Add to dashboard Cite

show abstract

“…The 1 H NMR spectra of the POEM-g-PAcAm comb copolymer is shown in Figure 2 b. The composition of the comb copolymers was calculated by integrating each of the corresponding chemical shifts, i.e., –CH 2 – (c) and OCH 3 (d) protons of POEM at 3.6 and 3.3 ppm, respectively [ 37 , 39 ], and –CH– (b) and –NH 2 – (e) protons of acryl amide at 1.6 and 7.8 ppm, respectively [ 40 , 41 ]. As shown in Table 1 , the compositions of the synthesized copolymers were consistent with the feed ratio of the monomers used, indicating a controlled polymerization reaction.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and CO2/N2 Separation Performance of POEM-g-PAcAm Comb Copolymer Membranes

et al. 2021

View full text Add to dashboard Cite

Alcohol-soluble comb copolymers were synthesized from rubbery poly(oxyethylene methacrylate) (POEM) and glassy polyacrylamide (PAcAm) via economical and facile free-radical polymerization. The synthesis of comb copolymers was confirmed by Fourier-transform infrared and proton nuclear magnetic resonance spectroscopic studies. The bicontinuous microphase-separated morphology and amorphous structure of comb copolymers were confirmed by wide-angle X-ray scattering, differential scanning calorimetry, and transmission electron microscopy. With increasing POEM content in the comb copolymer, both CO2 permeability and CO2/N2 selectivity gradually increased. A mechanically strong free-standing membrane was obtained at a POEM:PAcAm ratio of 70:30 wt%, in which the CO2 permeability and CO2/N2 selectivity reached 261.7 Barrer (1 Barrer = 10−10 cm3 (STP) cm cm−2 s−1 cmHg−1) and 44, respectively. These values are greater than those of commercially available Pebax and among the highest separation performances reported previously for alcohol-soluble, all-polymeric membranes without porous additives. The high performances were attributed to an effective CO2-philic pathway for the ethylene oxide group in the rubbery POEM segments and prevention of the N2 permeability by glassy PAcAm chains.

show abstract

“…As the ultraviolet light continued to radiate, the wave light was scattered and refracted in the place where the product had been synthesized, causing a rapid decrement of energy. It was difficult to ensure that the solution received enough energy to produce free radicals [28,29]. At this time, product synthesis depended on free radicals free movement that had been formed and a small number of free radicals produced autonomously.…”

Section: Effect Of Illumination Timementioning

confidence: 99%

Flocculation of a High-Turbidity Kaolin Suspension Using Hydrophobic Modified Quaternary Ammonium Salt Polyacrylamide

Xia

et al. 2019

Processes

View full text Add to dashboard Cite

In this work, a novel cationic polyacrylamide (PAMD) was synthesized by acrylamide (AM) diallyl dimethyl ammonium chloride (DMD) and dodecyl polyglucoside (DPL) under low-pressure ultraviolet (UV) initiation. The intrinsic viscosity and cationic degree of PAMD were optimized in copolymerization. The optimum synthesis conditions that affect polymerization were determined to be solid content 30%, DPL content 25%, DMD content 30%, illumination time 135 min, and pH 9. The flocculation performance of flocculant PAMD with a high cationic degree was investigated in the purification of high-turbidity water. The flocculation mechanism was correspondingly studied and summarized based on Fourier transform-infrared (FTIR) analysis. Finally, the results of an experimental simulation using the response surface method show that 98.9% supernatant transmittance was achieved under dosage 4 mg/L, fast stirring time 20 min, pH 7, and stirring speed 320 rpm.

show abstract

Facile synthesis of cauliflower-like hydrophobically modified polyacrylamide nanospheres by aerosol-photopolymerization

Cited by 20 publications

References 47 publications

Structural Evolution and Formation Mechanism of the Soft Colloidal Arrays in the Core of PAAm Nanofibers by Electrospun Packing

Structural Evolution and Formation Mechanism of the Soft Colloidal Arrays in the Core of PAAm Nanofibers by Electrospun Packing

Synthesis, Characterization, and CO2/N2 Separation Performance of POEM-g-PAcAm Comb Copolymer Membranes

Flocculation of a High-Turbidity Kaolin Suspension Using Hydrophobic Modified Quaternary Ammonium Salt Polyacrylamide

Contact Info

Product

Resources

About