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    2019-5-26 · Herein, we prepared nonionic DN and triple network (TN) hydrogels based on polyacrylamide (PAAm) and poly(N,N-dimethylacrylamide) (PDMA) with a high mechanical strength by sequential polymerization reactions. The TN approach is based on the decrease of the translational entropy of the second monomer upon its polymerization in the first network, so that additional solvent (third monomer) can enter into DN hydrogel …

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    The new initiator of the polymerization of acrylamide, leading to the formation of crosslinked polyacrylamide, was discovered. The structure of the synthesized polyacrylamide was characterized by XRD, 1H NMR, and 13C NMR spectroscopy. It was shown that 1,3-dimethylimidazolium (phosphonooxy-)oligosulphanide is able to initiate …

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    2018-9-7 · High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and friction ...

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    2013-7-15 · A straightforward method to prepare nonionic polymer (polyacrylamide, PAM) cross-linked chitosan hydrogel has been developed. The chitosan–polyacrylamide (CS–PAM) hydrogel could be quickly obtained by simply mixing of chitosan and polyacrylamide solutions under very benign condition (room temperature, <30 s).

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    2021-5-30 · According to XRF data, the synthesized polyacrylamide gel contains 0.28 wt% of sulphur. The formed polymer network has a low crosslinking density and a high equilibrium degree of swelling. The swelling rate of polyacrylamide gel in water corresponds to the first order kinetic equation with the rate constant 6.2 × 10 −2 min …

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    2019-7-8 · ductile, based on a relatively loosely cross-linked polyacrylamide (PAAm) nonionic network, containing 0.1 mol% MBAAm cross-linker relative to the monomer. These DN hydrogels are prepared in two steps. In the first step, the PAMPS single-network (SN) hydrogel is prepared. In the

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    Polyacrylamide/MgCl2 hybrid hydrogel desiccant was prepared from magnesium chloride and polyacrylamide by aqueous solution polymerization. The hybrid hydrogel was synthesized and characterized by X-ray diffraction. The effect of the experimental factors such as content of magnesium chloride, concentration of cross-linking agent, initiator …

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    2013-7-15 · A straightforward method to prepare nonionic polymer (polyacrylamide, PAM) cross-linked chitosan hydrogel has been developed. The chitosan–polyacrylamide (CS–PAM) hydrogel could be quickly obtained by simply mixing of chitosan and polyacrylamide solutions under very benign condition (room temperature, <30 s).

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    2018-2-12 · 2.2. Preparation of PAM-N-x catalysts For polyacrylamide hydrogel synthesis, briefly, 5.0 g acrylamide monomer and 0.005 g N,N'-methylenebisacrylamide (99%) was dissolved in 20 mL deionized water, and 0-1.2 g urea was added. After stirring for ~10 min, 1.0 mL 1.32×10-2 M ammonium persulfate solution was added dropwise with …

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    2011-11-30 · Mei-yi Xing, Cheng-long Yu, Yu-fen Wu, Lu Wang, Guo-ping Guan, Preparation and characterization of a polyvinyl alcohol/polyacrylamide hydrogel vascular graft reinforced with a braided fiber stent, Textile Research Journal, 10.1177/0040517519896753, (004051751989675), (2019).

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    2020-6-12 · [17] Guang Zhao,* Caili Dai,* Siyu Wang, Mingwei Zhao, Synthesis and application of nonionic polyacrylamide with controlled molecular weight for fracturing in low permeability oil reservoirs. Journal of Applied Polymer Science, 2015, DOI: 10.1002/APP.41637.

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    2019-12-25 · A PVA/PAAm (polyvinyl alcohol/polyacrylamide) hydrogel vascular graft reinforced by a braided fiber stent was prepared in the present work, and a series of characterizations were carried out for evaluating the comprehensive performance of the reinforced hydrogel vascular graft (RHVG), including the morphology, the mechanical …

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    Polyacrylamide/MgCl2 hybrid hydrogel desiccant was prepared from magnesium chloride and polyacrylamide by aqueous solution polymerization. The hybrid hydrogel was synthesized and characterized by X-ray diffraction. The effect of the experimental factors such as content of magnesium chloride, concentration of cross-linking agent, initiator …

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