Thermoresponsive properties of 3-, 4-, 6-, and 12-armed star-shaped poly[2-(dimethylamino)ethyl methacrylate]s prepared by core-first group transfer polymerization

2014 ◽  
Vol 5 (16) ◽  
pp. 4701-4709 ◽  
Author(s):  
Seiya Kikuchi ◽  
Yougen Chen ◽  
Keita Fuchise ◽  
Kenji Takada ◽  
Junsuke Kitakado ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Mass Concentration ◽  
Group Transfer ◽  
Ethyl Methacrylate ◽  
Cloud Points

The thermoresponsive behavior of a variety of star-shaped poly[2-(dimethylamino)ethyl methacrylate]s was intensively investigated by evaluating the effect of mass concentration in aqueous solution, molecular weight, or arm number of the polymers on their cloud points.

scholarly journals Purification of acrylamide from polymerization inhibitors in the manufacture of high quality flocculants based on polyacrylamide

2020 ◽  
Vol 3 (2) ◽  
pp. 109-113
Author(s):  
V. P. Duleba ◽  
◽  
Z. Ya. Hnativ ◽  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Polymerization Process ◽  
Iron Ions ◽  
Laboratory Studies ◽  
Catalytic Method ◽  
High Quality ◽  
Variable Valence ◽  
Sulfuric Acid Method ◽  
Practical Information

Polyacrylamide and its copolymers are widely used as flocculating agents for the separation of industrial suspensions. The formation of high molecular weight polymers depends on the content of various impurities present in the monomer. The article presents the scientific and practical information on the production of acrylamide by sulfuric acid method of hydration of nitrile acrylic acid in the form of an aqueous solution of different concentrations and a more modern heterogeneously catalytic method of hydration of acrylonitrile using as catalysts with variable valence. Ways to get different impurities in the stages of production of acrylamide with the purpose of applying appropriate methods for its purification. Laboratory studies of the purification of an aqueous solution of acrylamide from iron ions were carried out as an element of inhibition of the premature polymerization process.

scholarly journals Low Molecular Weight Gelators Based on Functionalized l-Dopa Promote Organogels Formation

Gels ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 27 ◽  
Author(s):  
Demetra Giuri ◽  
Nicola Zanna ◽  
Claudia Tomasini
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Rheological Properties ◽  
Rhodamine B ◽  
Lauric Acid ◽  
Water Solution ◽  
Preliminary Test ◽  
Low Molecular Weight ◽  
Coupling Reactions ◽  
Low Molecular Weight Gelators

We prepared the small pseudopeptide Lau-l-Dopa(OBn)2-d-Oxd-OBn (Lau = lauric acid; l-Dopa = l-3,4-dihydroxyphenylalanine; d-Oxd = (4R,5S)-4-methyl-5-carboxyl-oxazolidin-2-one; Bn = benzyl) through a number of coupling reactions between lauric acid, protected l-Dopa and d-Oxd with an excellent overall yield. The ability of the product to form supramolecular organogels has been tested with different organic solvents of increasing polarity and compared with the results obtained with the small pseudopeptide Fmoc-l-Dopa(OBn)2-d-Oxd-OBn. The mechanical and rheological properties of the organogels demonstrated solvent-dependent properties, with a storage modulus of 82 kPa for the ethanol organogel. Finally, to have a preliminary test of the organogels’ ability to adsorb pollutants, we treated a sample of the ethanol organogel with an aqueous solution of Rhodamine B (RhB) for 24 h. The water solution slowly lost its pink color, which became trapped in the organogel.

Preparation of poly(methyl methacrylate) nano-latexes via UV irradiation in the presence of iron aqueous solution

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Hong Zhang ◽  
Limin Zang ◽  
Jiahe Luo ◽  
Jinshan Guo
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Methyl Methacrylate ◽  
High Efficiency ◽  
Particle Sizes ◽  
H Nmr ◽  
Reaction Conversion ◽  
Emulsifying Agent

AbstractThe UV-initiated emulsion polymerization of methyl methacrylate (MMA) in the presence of FeCl3 was studied. The photopolymerization presented high efficiency even though using a small percentage of photoinitiator. The entire polymerization could be performed within 10 min and displayed a conversion higher than 90% at ambient temperature. The particle sizes could be tuned in the range of 20-90 nm. The effects of content of initiator and emulsifying agent upon the reaction conversion, distribution of molecular weight, diameter of particles and glass-transition temperature were examined. 1H-NMR technique was used to investigate the structural properties of PMMA.

Synthesis and Performance of Polycarboxylate Superplasticizers with Hydrophobic Side Chains

2013 ◽  
Vol 357-360 ◽  
pp. 1124-1129 ◽  
Author(s):  
Li Ya Wang ◽  
Yong Wei Wang ◽  
Gui Bo Gao ◽  
Ze Peng Chu ◽  
Yong Sheng Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Structural Information ◽  
Radical Copolymerization ◽  
Hydration Reaction ◽  
Side Chains ◽  
Air Content ◽  
Foaming Behavior ◽  
Gel Permeation ◽  
And Performance

Based on polycarboxylate chemistry, polycarboxylate superplasticizers (PCs) with hydrophobic side chains were synthesized through radical copolymerization reaction. The molecular weight and polydispersity index were analyzed by gel permeation chromatograph (GPC), and the results showed the same structural information. The performances of PCs in cement paste were tested by measuring the fluidity and fluidity retention. The slump and the compressive strengths of concrete were also determined. Additionally, the foaming behavior of PCs was investigated by the foam volume, the surface tension of PCs aqueous solution,and the air content of concrete. According to the data, the hydrophobic side chains of PCs may affect the hydration reaction of cement resulting in better workability.

Effect of Molecular Weight and Arm Number on the Growth and pH-Dependent Morphology of Star Poly[2-(dimethylamino)ethyl methacrylate]/Poly(styrenesulfonate) Multilayer Films

2010 ◽  
Vol 43 (21) ◽  
pp. 9087-9093 ◽  
Author(s):  
Zhizhang Guo ◽  
Xingyu Chen ◽  
Jianyu Xin ◽  
Duo Wu ◽  
Jianshu Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Multilayer Films ◽  
Ethyl Methacrylate ◽  
Ph Dependent
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