Synthesis of poly(N-acryloylmorpholine) macromonomers using RAFT and their copolymerization with methacrylic acid for the design of graft copolymer additives for concrete

2016 ◽  
Vol 7 (4) ◽  
pp. 917-925 ◽  
Author(s):  
T. Boursier ◽  
S. Georges ◽  
M. Mosquet ◽  
D. Rinaldi ◽  
F. D'Agosto
Keyword(s):  
Graft Copolymer ◽  
Methacrylic Acid ◽  
Molar Mass ◽  
Average Molar Mass ◽  
Post Modification

Methacrylate end-capped poly(N-acryloylmorpholine) macromonomers (PNAM-MA) of number-average molar mass of about 2400 g mol−1 have been synthesized by post-modification of PNAM chains obtained by RAFT.

Sizing process of cotton yarn by size from a copolymer of methacrylic acid and hydrolyzed potato starch

2018 ◽  
Vol 89 (17) ◽  
pp. 3457-3465 ◽  
Author(s):  
Suzana Djordjevic ◽  
Stana Kovacevic ◽  
Dragan Djordjevic ◽  
Sandra Konstantinovic
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Methacrylic Acid ◽  
Molar Mass ◽  
Breaking Strength ◽  
Potato Starch ◽  
Cotton Yarn ◽  
Textile Processing ◽  
Average Molar Mass ◽  
Commercial Medium

In this paper, the synthesis, characterization and application of a copolymer as a sizing agent obtained by the grafting of methacrylic acid on hydrolyzed potato starch were investigated. Starch hydrolysis was performed in order to reduce the average molar mass (i.e. the size of the macromolecules). Grafting of methacrylic acid on hydrolyzed potato starch was performed to obtain a product that can be effective in textile processing, for example, for sizing yarn. The grafting of the monomer has been confirmed by Fourier transform infrared spectroscopy spectra of hydrolyzed and grafted potato starch. The distribution of molar masses was determined chromatographically. The results obtained by sizing of cotton yarn with the new starch agent confirmed its higher breaking strength, elongation, abrasion resistance, reduced hairiness, better evenness, etc. Grafted hydrolyzed potato starch (almost identical to the commercial medium) exhibits better performance as a potential agent for sizing cotton yarn than ungrafted hydrolyzed starch.

Fluorometric and Ultraviolet−Visible Absorption Study of Poly(methacrylic acid) Shells of High-Molar-Mass Block Copolymer Micelles†

Langmuir ◽  
1999 ◽  
Vol 15 (12) ◽  
pp. 4185-4193 ◽  
Author(s):  
Miroslav Štěpánek ◽  
Klára Podhájecká ◽  
Karel Procházka ◽  
Yue Teng ◽  
Stephen E. Webber
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Molar Mass ◽  
Absorption Study ◽  
Visible Absorption ◽  
High Molar Mass ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Inter-laboratory evaluation of SEC-post-column calcofluor for determination of the weight-average molar mass of cereal β-glucan

2015 ◽  
Vol 124 ◽  
pp. 254-264 ◽  
Author(s):  
Anne Rieder ◽  
Svein Halvor Knutsen ◽  
Ann-Sissel T. Ulset ◽  
Bjørn E. Christensen ◽  
Roger Andersson ◽  
...  
Keyword(s):  
Molar Mass ◽  
Laboratory Evaluation ◽  
Average Molar Mass

scholarly journals Determination of the Average Molar Mass of the Vapour Above Molten Sodium Chloride by the Transpiration Method.

1979 ◽  
Vol 33a ◽  
pp. 407-412 ◽  
Author(s):  
Halvor Kvande ◽  
Oldrich Strouf ◽  
Pär Svanström ◽  
Elina Näsäkkälä ◽  
Eberhard Hoyer ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Molar Mass ◽  
Average Molar Mass ◽  
Molten Sodium ◽  
Transpiration Method

The effect of polymer branching and average molar mass on the formation, stabilization and thermoresponsive properties of gold nanohybrids stabilized by poly(N-isopropylacrylamides)

2015 ◽  
Vol 6 (32) ◽  
pp. 5838-5850 ◽  
Author(s):  
Hong Hanh Nguyen ◽  
Annie Brûlet ◽  
Dominique Goudounèche ◽  
Pascale Saint-Aguet ◽  
Nancy Lauth-de Viguerie ◽  
...  
Keyword(s):  
Molar Mass ◽  
Average Molar Mass

The architecture of PNIPAM based polymers strongly influences both their thermoresponsiveness and their abilities to control and stabilize AuNP formation.

Adhesive properties of aluminum-containing functionalized polymer composites obtained in the process of mechano-chemical modification

2021 ◽  
Vol 10 ◽  
pp. 27-36
Author(s):  
K. V. Allahverdiyeva ◽  
Keyword(s):  
Maleic Anhydride ◽  
Polymer Matrix ◽  
Graft Copolymer ◽  
Methacrylic Acid ◽  
Graft Copolymers ◽  
Aluminum Foil ◽  
Adhesive Properties ◽  
Pressing Temperature ◽  
Type Of Fracture ◽  
Dispersed Aluminum

The influence of the concentration of finely dispersed aluminum and compatibilizer on the resistance to peeling of aluminum foil from the surface of a composite based on low density polyethylene and high density polyethylene is considered. To improve the compatibility of the filler with the polymer matrix, a compatibilizer was used, which is a graft copolymer of polyethylene of various grades with methacrylic acid and maleic anhydride. Copper and aluminum foil was used as a substrate. It is shown that the introduction of a compatibilizer into the composition of aluminum-filled composites improves their peeling resistance. It has been found that if an aluminum filled compatibilizer is used directly as an adhesive, then the peeling resistance of copper and aluminum foil is significantly increased. Graft copolymers of polyethylene with maleic anhydride have the highest peel resistance values. The results of the study of the influence of the pressing temperature on the type of adhesive failure are presented. It is shown that with an increase in the pressing temperature, a mixed type of adhesive destruction is observed. It has been experimentally proved that, in percentage terms, the cohesive type of fracture prevails in composites where graft copolymers are used as a polymer matrix. It was found that a 100 % cohesive type of fracture is observed in foil-clad composites pressed at a temperature of 190 °C, where a graft copolymer of polyethylene with methacrylic acid or maleic anhydride is used as an adhesive.

scholarly journals Hyaluronic Acid in the Intestinal Tract: Influence of Structure, Rheology, and Mucoadhesion on the Intestinal Uptake in Rats

Biomolecules ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1422
Author(s):  
Alexandro Barbosa de Souza ◽  
Marco Vinícius Chaud ◽  
Thais Francine Alves ◽  
Juliana Ferreira de Souza ◽  
Maria Helena Andrade Santana
Keyword(s):  
Hyaluronic Acid ◽  
Intestinal Tract ◽  
Molar Mass ◽  
Hydrodynamic Diameter ◽  
Average Molar Mass ◽  
Intestinal Membrane ◽  
Mixed Formulations ◽  
Jejunum Segment

Oral hyaluronic acid (HA) is a ubiquitous biopolymer that has gained attention as a treatment for local or systemic diseases. Here, we prepared and characterized structures of free HA (f-HA) with a high (>105 Da), intermediate (≤105 Da), and low (≤104 Da) average molar mass (MM); nanoparticles crosslinked with adipic dihydrazide (n-HA); and mixed formulations (mixed-HA) containing f-HA and n-HA. MM distribution determined the structure, hydrodynamic diameter, and zeta potential of the f-HAs. Crosslinking changed the physicochemical properties in n-HA. In vitro tack adhesion assays, using mucin tablets or a viable rat intestinal mucosa, showed better mucoadhesion with f-HA (intermediate MM) and mixed-HA (25% n-HA), especially in the jejunum segment. High MM f-HA presented negligible mucoadhesion. n-HA showed the deepest diffusion into the porous of the membranes. In vivo results showed that, except for high MM f-HA, there is an inverse relationship between rheological changes in the intestinal membrane macerates resulting from mucoadhesion and the effective intestinal permeability that led to blood clearance of the structures. We conclude that the n-HA formulations are promising for targeting other tissues, while formulations of f-HA (intermediate MM) and mixed-HA are better for treating dysbiosis.

scholarly journals The investigations of bioactive copper(II) complexes with reduced low-molar dextran

2008 ◽  
Vol 22 (2-3) ◽  
pp. 177-185 ◽  
Author(s):  
Milorad Cakić ◽  
Žarko Mitić ◽  
Goran S. Nikolić ◽  
Ljubomir Ilić ◽  
Goran M. Nikolić
Keyword(s):  
Fourier Transform ◽  
Complex Formation ◽  
Room Temperature ◽  
Molar Mass ◽  
Reaction Conditions ◽  
Average Molar Mass ◽  
Square Planar ◽  
Physicochemical Methods ◽  
Fourier Transform Ir ◽  
Aqueous Complexes

The optimization of the reaction conditions (pH,T,t) to obtain stable copper(II) ion complexes with dextran derivatives were investigated in this paper. A complete synthesis of stable aqueous complexes can be realized with reduced low-molar polysaccharides, at an average molar mass 5000 g mol–1and pH 7.5–8. Fourier-transform IR spectra of polysaccharide dextran and its compounds with copper(II) ion, recorded at room temperature, were analyzed in order to obtain the information about the structure and the conformation of these polymer compounds. The ESR parameters of the spectra indicate the square-planar coordination of Cu(II) ion with four O atoms. Copper(II) complex formation with dextran and its derivatives were analyzed by physicochemical methods. Synthesized complexes of Cu(II) ion with reduced low-molar dextran in comparison with commercial preparations showed the considerably lower acute toxicity (LD501705).

scholarly journals Quantification of Polyphenols in Seaweeds: A Case Study of Ulva intestinalis

Antioxidants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 612 ◽  
Author(s):  
Marie Emilie Wekre ◽  
Karoline Kåsin ◽  
Jarl Underhaug ◽  
Bjarte Holmelid ◽  
Monica Jordheim
Keyword(s):  
Gallic Acid ◽  
Qualitative Data ◽  
Molar Mass ◽  
Total Phenolic ◽  
Special Importance ◽  
Average Molar Mass ◽  
Complex Samples ◽  
Ulva Intestinalis ◽  
Polyphenolic Profile

In this case study, we explored quantitative 1H NMR (qNMR), HPLC-DAD, and the Folin-Ciocalteu assay (TPC) as methods of quantifying the total phenolic content of a green macroalga, Ulva intestinalis, after optimized accelerated solvent extraction. Tentative qualitative data was also acquired after multiple steps of purification. The observed polyphenolic profile was complex with low individual concentrations. The qNMR method yielded 5.5% (DW) polyphenols in the crude extract, whereas HPLC-DAD and TPC assay yielded 1.1% (DW) and 0.4% (DW) respectively, using gallic acid as the reference in all methods. Based on the LC-MS observations of extracts and fractions, an average molar mass of 330 g/mol and an average of 4 aromatic hydrogens in each spin system was chosen for optimized qNMR calculations. Compared to the parallel numbers using gallic acid as the standard (170 g/mol, 2 aromatic H), the optimized parameters resulted in a similar qNMR result (5.3%, DW). The different results for the different methods highlight the difficulties with total polyphenolic quantification. All of the methods contain assumptions and uncertainties, and for complex samples with lower concentrations, this will be of special importance. Thus, further optimization of the extraction, identification, and quantification of polyphenols in marine algae must be researched.

Heterophase grafting polymerization of methacrylic acid onto poly(caproamide) fibres and the structure of the graft copolymer

1991 ◽  
Vol 33 (3) ◽  
pp. 575-580
Author(s):  
L.G. Kazaryan ◽  
V.A. Vasil'ev ◽  
N.V. Smirnova ◽  
G.A. Gabrielyan ◽  
L.S. Gal'braikh
Keyword(s):  
Graft Copolymer ◽  
Methacrylic Acid ◽  
Grafting Polymerization
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