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Journal articles on the topic 'N-vinyl formamide'

Author: Grafiati

Published: 24 April 2022

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1

Chowdoji Rao, K., S. Venkata Naidu, and A. Varada Rajulu. "Acoustical parameters of poly(vinyl pyrrolidone) in N,N-dimethyl formamide solutions." European Polymer Journal 26, no. 6 (January 1990): 657–59. http://dx.doi.org/10.1016/0014-3057(90)90224-r.

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2

Mostafa, Khaled M., Abdul Rahim Samarkandy, and Azza A. El-Sanabary. "Synthesis and characterization of (poly (N-vinyl formamide)—pregelled starch—graft copolymer." Journal of Polymer Research 17, no. 6 (December 15, 2009): 789–800. http://dx.doi.org/10.1007/s10965-009-9370-z.

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3

Yao, Kai, Songlin Wang, Qian Wang, and Xuxu Yang. "Synthesis and Characterization of Functional Monomer N ‐Vinyl Formamide (NVF)." Macromolecular Chemistry and Physics 223, no. 2 (December 19, 2021): 2100386. http://dx.doi.org/10.1002/macp.202100386.

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4

Zhang, Tao, Guangtao Chang, and Qipeng Guo. "Thermoreversible Polymer Gels in DMF Formed from Charge- and Crystallization-Induced Assembly." Polymers 12, no. 9 (September 10, 2020): 2056. http://dx.doi.org/10.3390/polym12092056.

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Polymer organogels formed through dynamic interactions are interesting for various applications. The fabrication of polymer organogels in polar solvents through ionic interaction is rare, although such organogels in non-polar organic solvents have been well studied. Herein, polymer organogels in a polar solvent N,N-dimethyl formamide (DMF) were fabricated from a triblock copolymer, poly(4-vinyl pyridine)-block-poly(ethylene glycol)-block-poly(4-vinyl pyridine) (4VPm-EGn-4VPm), and a fluorinated surfactant, perfluorooctanoic acid (PFOA), and their microphase separation and properties were studied. Ordered microphase separation and the crystalline structures were revealed by small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS), respectively. All the 4VPm-EGn-4VPm/PFOA organogels are sensitive to temperature, and the ratio of PFOA to pyridine groups reversibly. The polymer organogels are also responsive to triethylamine and triethylammonium acetate.

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5

Mishra, Madan Mohan, Mithilesh Yadav, Arpit Sand, Jasaswini Tripathy, and Kunj Behari. "Water soluble graft copolymer (κ-carrageenan-g-N-vinyl formamide): Preparation, characterization and application." Carbohydrate Polymers 80, no. 1 (March 2010): 235–41. http://dx.doi.org/10.1016/j.carbpol.2009.11.009.

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6

Suekama, Tiffany C., Vara Aziz, Zahra Mohammadi, Cory Berkland, and Stevin H. Gehrke. "Synthesis and characterization of poly(N-vinyl formamide) hydrogels-A potential alternative to polyacrylamide hydrogels." Journal of Polymer Science Part A: Polymer Chemistry 51, no. 2 (October 31, 2012): 435–45. http://dx.doi.org/10.1002/pola.26401.

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7

Stach, Marek, Igor Lacík, Peter Kasák, Dušan Chorvát, Alan J. Saunders, Sandhya Santanakrishnan, and Robin A. Hutchinson. "Free-Radical Propagation Kinetics of N -Vinyl Formamide in Aqueous Solution Studied by PLP-SEC." Macromolecular Chemistry and Physics 211, no. 5 (February 3, 2010): 580–93. http://dx.doi.org/10.1002/macp.200900545.

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8

Thaiboonrod, Sineenat, Francesco Cellesi, Rein V. Ulijn, and Brian R. Saunders. "One-Step Preparation of Uniform Cane-Ball Shaped Water-Swellable Microgels Containing Poly(N-vinyl formamide)." Langmuir 28, no. 11 (January 24, 2012): 5227–36. http://dx.doi.org/10.1021/la204606v.

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9

Banerjee, Jaya, Arti Srivastava, Abhishek Srivastava, and Kunj Behari. "Synthesis and characterization of xanthan gum-g-N-vinyl formamide with a potassium monopersulfate/Ag(I) system." Journal of Applied Polymer Science 101, no. 3 (2006): 1637–45. http://dx.doi.org/10.1002/app.24074.

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10

Karagoz, Bunyamin, Gulay Bayramoglu, Begum Altintas, Niyazi Bicak, and M. Yakup Arica. "Amine functional monodisperse microbeads via precipitation polymerization of N-vinyl formamide: Immobilized laccase for benzidine based dyes degradation." Bioresource Technology 102, no. 13 (July 2011): 6783–90. http://dx.doi.org/10.1016/j.biortech.2011.03.050.

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11

Scalet, Joseph M., Tiffany C. Suekama, Jeayoung Jeong, and Stevin H. Gehrke. "Enhanced Mechanical Properties by Ionomeric Complexation in Interpenetrating Network Hydrogels of Hydrolyzed Poly (N-vinyl Formamide) and Polyacrylamide." Gels 7, no. 3 (June 29, 2021): 80. http://dx.doi.org/10.3390/gels7030080.

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Tough hydrogels were made by hydrolysis of a neutral interpenetrating network (IPN) of poly (N-vinyl formamide) PNVF and polyacrylamide (PAAm) networks to form an IPN of polyvinylamine (PVAm) and poly (acrylic acid) (PAAc) capable of intermolecular ionic complexation. Single network (SN) PAAm and SN PNVF have similar chemical structures, parameters and physical properties. The hypothesis was that starting with neutral IPN networks of isomeric monomers that hydrolyze to comparable extents under similar conditions would lead to formation of networks with minimal phase separation and maximize potential for charge–charge interactions of the networks. Sequential IPNs of both PNVF/PAAm and PAAm/PNVF were synthesized and were optically transparent, an indication of homogeneity at submicron length scales. Both IPNs were hydrolyzed in base to form PVAm/PAAc and PAAc/PVAm IPNs. These underwent ~5-fold or greater decrease in swelling at intermediate pH values (3–6), consistent with the hypothesis of intermolecular charge complexation, and as hypothesized, the globally neutral, charge-complexed gel states showed substantial increases in failure properties upon compression, including an order of magnitude increases in toughness when compared to their unhydrolyzed states or the swollen states at high or low pH values. There was no loss of mechanical performance upon repeated compression over 95% strain.

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12

Luo, Wanjie, Lulu Wang, Ruijiang Feng, Chongfeng Zhao, Jilin Wang, and Tianzhou Cai. "Preparation of composite anion exchange membranes based on in‐situ copolymerization of N‐vinyl formamide and divinylbenzene in porous PTFE." Journal of Applied Polymer Science 138, no. 8 (September 11, 2020): 49872. http://dx.doi.org/10.1002/app.49872.

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13

Mishra, Dinesh Kumar, Jasaswini Tripathy, Abhishek Srivastava, Madan Mohan Mishra, and Kunj Behari. "Graft copolymer (chitosan-g-N-vinyl formamide): Synthesis and study of its properties like swelling, metal ion uptake and flocculation." Carbohydrate Polymers 74, no. 3 (November 2008): 632–39. http://dx.doi.org/10.1016/j.carbpol.2008.04.015.

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14

Yue, Yijun, Lan Zheng, Yuqi Wang, Jinqiao Wu, Shanshan Li, Xiaolong Han, and Le Wu. "A novel polyamidine-grafted carboxymethylcellulose: Synthesis, characterization and flocculation performance test." e-Polymers 19, no. 1 (May 29, 2019): 225–34. http://dx.doi.org/10.1515/epoly-2019-0023.

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AbstractThis study facilitates the synthesis process of a novel graft copolymer (flocculant) using carboxymethyl cellulose, acrylonitrile and N-vinyl formamide as raw materials. The carboxymethyl cellulose graft polyamidine (CMC-g-PAMD) can be used as new flocculant to replace the traditional polyacrylamide flocculant, which manifested its excellent flocculation and degradation efficiency. A five-membered cyclic copolymer was prepared by the graft copolymerization, and the synthesized flocculants were characterized by EA, TG-DTG, FT-IR, SEM and NMR, confirming the successful synthesis of the desired copolymers. The operation conditions for copolymerization were experimentally investigated, and the results indicated that the optimal initiator dosage, copolymerization temperature, amidinization temperature, acidification time and flocculant dosage were 4 g/L, 50°C, 90°C, 3 h and 60 mg/L, respectively. Compared with the traditional polyacrylamide flocculant, the CMC-g-PAMD presented an outstanding flocculation ability of 96.1% under its optimal operation conditions, which showed an enormous potential in the application of coalmine waste-water treatment.

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15

Zataray, J., A. Aguirre, J. C. de la Cal, and J. R. Leiza. "Polymerization of N-Vinyl Formamide in Homogeneous and Heterogeneous Media and Surfactant Free Emulsion Polymerization of MMA Using Polyvinylamine as Stabilizer." Macromolecular Symposia 333, no. 1 (November 2013): 80–92. http://dx.doi.org/10.1002/masy.201300083.

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16

Zataray, Julieta, Amaia Agirre, Paula Carretero, Leire Meabe, José C. de la Cal, and Jose R. Leiza. "Characterization of poly (N-vinyl formamide) by size exclusion chromatography-multiangle light scattering and asymmetric-flow field-flow fractionation-multiangle light scattering." Journal of Applied Polymer Science 132, no. 34 (May 20, 2015): n/a. http://dx.doi.org/10.1002/app.42434.

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17

Subhan, Hanif, Sultan Alam, Luqman Ali Shah, Muhammad Waqas Ali, and Muhammad Farooq. "Sodium alginate grafted poly(N-vinyl formamide-co-acrylic acid)-bentonite clay hybrid hydrogel for sorptive removal of methylene green from wastewater." Colloids and Surfaces A: Physicochemical and Engineering Aspects 611 (February 2021): 125853. http://dx.doi.org/10.1016/j.colsurfa.2020.125853.

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18

Zhou, Hongkang, Maochun Li, Jian Zhu, Rouxi Chen, Xin Wang, and Hsing-Lin Wang. "Exploring polymer precursors for low-cost high performance carbon fiber: A materials genome approach to finding polyacrylonitrile-co-poly(N-vinyl formamide)." Polymer 243 (March 2022): 124570. http://dx.doi.org/10.1016/j.polymer.2022.124570.

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19

Behera, M. "Proposing a Feasible Mechanism to Support the Exhibition of Superb Colloidal Stability of Gold Nanoparticles with Poly Vinyl Pyrrolidone in the form of a Nanofluid in N, N-Dimethyl Formamide." Research Journal of Nanoscience and Nanotechnology 5, no. 2 (February 1, 2015): 60–73. http://dx.doi.org/10.3923/rjnn.2015.60.73.

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20

Csengeri, T., A. Belloche, S. Bontemps, F. Wyrowski, K. M. Menten, and L. Bouscasse. "Search for high-mass protostars with ALMA revealed up to kilo-parsec scales (SPARKS)." Astronomy & Astrophysics 632 (November 27, 2019): A57. http://dx.doi.org/10.1051/0004-6361/201935226.

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Context. Classical hot cores are rich in molecular emission, and they show a high abundance of complex organic molecules (COMs). The emergence of molecular complexity that is represented by COMs, in particular, is poorly constrained in the early evolution of hot cores. Aims. We put observational constraints on the physical location of COMs in a resolved high-mass protostellar envelope associated with the G328.2551−0.5321 clump. The protostar is single down to ~400 au scales and we resolved the envelope structure down to this scale. Methods. High angular resolution observations using the Atacama Large Millimeter Array allowed us to resolve the structure of the inner envelope and pin down the emission region of COMs. We use local thermodynamic equilibrium modelling of the available 7.5 GHz bandwidth around ~345 GHz to identify the COMs towards two accretion shocks and a selected position representing the bulk emission of the inner envelope. We quantitatively discuss the derived molecular column densities and abundances towards these positions, and use our line identification to qualitatively compare this to the emission of COMs seen towards the central position, corresponding to the protostar and its accretion disk. Results. We detect emission from 10 COMs, and identify a line of deuterated water (HDO). In addition to methanol (CH3OH), methyl formate (CH3OCHO) and formamide (HC(O)NH2) have the most extended emission. Together with HDO, these molecules are found to be associated with both the accretion shocks and the inner envelope, which has a moderate temperature of Tkin ~ 110 K. We find a significant difference in the distribution of COMs. O-bearing COMs, such as ethanol, acetone, and ethylene glycol are almost exclusively found and show a higher abundance towards the accretion shocks with Tkin ~ 180 K. Whereas N-bearing COMs with a CN group, such as vinyl and ethyl cyanide peak on the central position, thus the protostar and the accretion disk. The molecular composition is similar towards the two shock positions, while it is significantly different towards the inner envelope, suggesting an increase in abundance of O-bearing COMs towards the accretion shocks. Conclusions. We present the first observational evidence for a large column density of COMs seen towards accretion shocks at the centrifugal barrier at the inner envelope. The overall molecular emission shows increased molecular abundances of COMs towards the accretion shocks compared to the inner envelope. The bulk of the gas from the inner envelope is still at a moderate temperature of Tkin ~ 110 K, and we find that the radiatively heated inner region is very compact (<1000 au). Since the molecular composition is dominated by that of the accretion shocks and the radiatively heated hot inner region is very compact, we propose this source to be a precursor to a classical, radiatively heated hot core. By imaging the physical location of HDO, we find that it is consistent with an origin within the moderately heated inner envelope, suggesting that it originates from sublimation of ice from the grain surface and its destruction in the vicinity of the heating source has not been efficient yet.

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21

Shah, Luqman Ali, Komal Gul, Ijaz Ali, Abbas Khan, Sayyar Muhammad, Mohib Ullah, Iram Bibi, and Sabiha Sultana. "Poly (N-vinyl formamide-co-acrylamide) hydrogels: synthesis, composition and rheology." Iranian Polymer Journal, March 4, 2022. http://dx.doi.org/10.1007/s13726-022-01043-x.

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22

Wen-Hong, Liu, Yu Ting-Yi, T. Leon Yu, and Lin Hsiu-Li. "Static light scattering and transmission microscopy study of dilute Nafion solutions." e-Polymers 7, no. 1 (December 1, 2007). http://dx.doi.org/10.1515/epoly.2007.7.1.1264.

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AbstractNafion, an ionomer composed of perfluorocarbon backbone and vinyl ether side chains terminated with -SO3 - groups, has dual solubility parameters, i.e. δ1= 9.7 (cal/cm3)1/2 relating to perfluorocarbon backbones and δ2 = 17.3 (cal/cm3)1/2 relating to sulfonated vinyl ether side chains. It had been reported that Nafion molecules aggregated in dilute and semi-dilute water and alcohol solutions. In this study, we report static light scattering (SLS) measurements of dilute Nafion in N,N’- dimethyl formamide (DMF, solubility parameter δ =12.2 (cal/cm3)1/2, dielectric constant ε=36.7) and N,N’-dimethyl acetamide (DMAc, δ =10.8 (cal/cm3)1/2, ε=37.8) solutions with Nafion concentrations ranging from 0.2 mg/ml to 1.0 mg/ml. The DMF and DMAc solvents have δ closing to δ1 of Nafion perfluorocarbon backbones and ε much lower than water (ε =78). Thus DMF and DMAc are compatible with Nafion perfluorocarbon and few Nafion molecules aggregate in DMF and DMAc solvents when [Nafion]< 1.0 mg/ml. The lower ε of DMF and DMAc led to low polyelectrolyte effect of Nafion in these two solvents. The obtained Mws of present work were in good agreement with the Mw obtained from Nafion in dilute dimethyl sulfoxide (DMSO, δ =12.0 (cal/cm3)1/2, ε=46.6) solutions, reported by Lousenberg, using size exclusion chromatography incorporating static light scattering detection. The <RG> data obtained from SLS measurements were compared with the particles sizes of transmission electron microscope (TEM) observations of freeze dried Nafion thin films prepared on copper grids with 0.6 mg/ml Nafion solutions. Comparable results were obtained from these two observations.

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