Blue Light Initiated Photopolymerization: Kinetics and Synthesis of Superabsorbent and Robust Poly(<i>N</i>,<i>N</i>′-dimethylacrylamide/Sodium Acrylate) Hydrogels

Sun, Guangdong; Huang, Yi; Li, Dapeng; Chen, Enyu; Zhong, Yuhao; Fan, Qinguo; Shao, Jianzhong

doi:10.1021/acs.iecr.9b00872

Cited by 18 publications

(17 citation statements)

References 37 publications

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“…Apparently, the growth behaviour of time‐related G′ followed a power‐law relationship, which offered an efficient tool with which to quantify the real time evolution of G′ and final storage modulus,

G_{\infty}^{'}

25,26 . The platform modulus (

G_{\infty}^{'}

) of photocured polymers was improved with the increase in the amino group content and appeared to fall into the range of 36‐55 kPa as the amino group content varied from 0% to 0.101% (Figure 11C).…”

Section: Resultsmentioning

confidence: 93%

Preparation of polyurethane acrylate‐based titanium dioxide pigment and its use in blue light‐curable ink

Wang

Yan

Luo

et al. 2021

Coloration Technology

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Polyurethane acrylate‐based titanium dioxide was used to prepare blue light‐curable inks as both a white pigment to replace the original white pigment and as an oligomer. The polyurethane acrylate‐based titanium dioxide was fabricated using a two‐step method. In the first step, the titanium dioxide was grafted with γ‐aminopropyltriethoxy silane, and the grafting process was studied. Second, amino‐modified titanium dioxide was used to prepare polyurethane acrylate‐based titanium dioxide, which was then used to configure the blue light‐curable polyurethane acrylate‐based titanium dioxide ink. Fourier Transform–infrared spectroscopy indicated that the amino‐modified titanium dioxide and polyurethane acrylate‐based titanium dioxide were prepared successfully. The content of the amino groups on the surface of the amino‐modified titanium dioxide could be effectively controlled by adjusting the pH value. Moreover, by increasing the content of the amino groups, the viscosity decreased and the photopolymerisation efficiency increased, which was attributed to the formation of branched structures and the promoting effect of the amino groups on the titanium dioxide. The inks with decreased viscosity and branched structures displayed excellent cross‐linking properties: viscoelastic transition was achieved within 10 seconds and the final moduli were in the range of 36‐55 kPa. The cross‐linking degree and rate were more than seven times those of unmodified ink. The ranges of elongation and stress were 95%‐165% and 1.9‐4.3 MPa, respectively, and the amino group content varied from 0% to 0.101%. In general, polyurethane acrylate‐based titanium dioxide was shown to be suitable for blue light‐curable ink.

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G_{\infty}^{'}

25,26 . The platform modulus (

G_{\infty}^{'}

Section: Resultsmentioning

confidence: 93%

Preparation of polyurethane acrylate‐based titanium dioxide pigment and its use in blue light‐curable ink

Wang

Yan

Luo

et al. 2021

Coloration Technology

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“…The same is observed for HG-5 of comparable composition, but the curve is still even steeper and reaches %W r ~ 10 at a temperature 5 K lower than HG-3. It is obvious that NaAc, which presents hydrophilic carboxylate groups, decreases the intensity of LCST of the polyNIPAAm segments [ 14 ]. Both DMAA as well as the small amount of NaAc, randomly distributed in the PNIPAAM gel structure ( Scheme 3 ), lead to a significant shift of the volume phase transition temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Sun et al, also using the self-crosslink capacity of dimethylacrylamide, obtained dimethylacrylamide and sodium acrylate hydrogels by photoinitiation with camphorquinone and diphenyliodonium hexafluorophosphate, obtaining a hydrogel with excellent mechanical properties and high water absorption [ 14 ]. Thus, the self-crosslinking ability of DMAA allows for a very simple gel formulation without any influence of chemically different crosslinking moieties and leads to a favorable, homogeneous gel structure with high water absorption ability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Stiff, Self-Crosslinked Thermoresponsive DMAA Hydrogels

et al. 2020

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Stiff thermosensitive hydrogels (HG) were synthesized by self-crosslinking free radical polymerization of N,N-dimethylacrylamide (DMAA) and N-isopropylacrylamide (NIPAAm), adjusting the degree of swelling by carboxylate-containing sodium acrylate (NaAc) or a 2-oxazoline macromonomer (MM). The formation of hydrogels was possible due to the self-crosslinking property of DMAA when polymerized with peroxodisulfate initiator type. The MM was synthetized by the ring-opening cationic polymerization of 2-methyl-2-oxazoline (MeOxa) and methyl-3-(oxazol-2-yl)-propionate (EsterOxa), and contained a polymerizable styryl endgroup. After ester hydrolysis of EsterOxa units, a carboxylate-containing MM was obtained. The structure of the hydrogels was confirmed by 1H high-resolution (HR)-MAS NMR spectroscopy. Suitable conditions and compositions of the comonomers have been found, which allowed efficient self-crosslinking as well as a thermoresponsive swelling in water. Incorporation of both the polar comonomer and the macromonomer, in small amounts furthermore allowed the adjustment of the degree of swelling. However, the macromonomer was better suited to retain the thermoresponsive behavior of the poly (NIPAAm) due to a phase separation of the tangling polyoxazoline side chains. Thermogravimetric analysis determined that the hydrogels were stable up to ~ 350 °C, and dynamic mechanical analysis characterized a viscoelastic behavior of the hydrogels, properties that are required, for example, for possible use as an actuator material.

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“…Besides, transition metal complexes were reported to be able to crosslink protein macromolecule by visible light through a redox route 22 . Shao et al investigated the kinetics of blue light initiated photopolymerization and characterized the mechanical and rheological properties of the resulting hydrogels 23–24 . Despite these efforts, the options for an efficient blue light photoinitiator in initializing an aqueous solution photopolymerization for rapid fabrication of hydrogels were inevitably narrowed down by many nonnegligible factors including the water‐solubility of photoinitiators and its utilization and transformation for visible light energy, and the activity of free radicals in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Photoinitiation mechanisms and photogelation kinetics of blue light induced polymerization of acrylamide with bicomponent photoinitiators

Sun

Huang

et al. 2021

Journal of Polymer Science

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Blue light induced free radical photopolymerization of acrylamide (AM) was studied using five bicomponent photoinitiators, camphorquinon, riboflavin-5 0phosphate sodium, curcumin, eosin Y, and Ru(bpy) 3 Cl 2 (Ru(II)) as photosensitizer, and diphenyliodonium hexafluorophosphate or potassium persulfate as electron acceptor. Fluorescence and UV-vis spectroscopies were used in combination with molecular orbital computations to characterize the photochemical behaviors of the five bicomponent photoinitiators, explore the possible electron transfer pathways of the photoinitiation processes, and quantify photopolymerization efficiencies. Real-time photogelation behavior of poly(AM) was monitored by Photo-differential scanning calorimetry and photo-rheometry. Photogelation kinetic parameters, including dG 0 (storage modulus)/dt, dG 00 (loss modulus)/dt, time delay of gelation (t d), and duration of gelation (Δt gel), were derived from photorheological data analyses and used to identify the best bicomponent photoinitiator candidate for rapid fabrication of blue light induced photopolymerizable hydrogels for biomedical applications.

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Blue Light Initiated Photopolymerization: Kinetics and Synthesis of Superabsorbent and Robust Poly(N,N′-dimethylacrylamide/Sodium Acrylate) Hydrogels

Cited by 18 publications

References 37 publications

Preparation of polyurethane acrylate‐based titanium dioxide pigment and its use in blue light‐curable ink

Preparation of polyurethane acrylate‐based titanium dioxide pigment and its use in blue light‐curable ink

Synthesis and Characterization of Stiff, Self-Crosslinked Thermoresponsive DMAA Hydrogels

Photoinitiation mechanisms and photogelation kinetics of blue light induced polymerization of acrylamide with bicomponent photoinitiators

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