Photomodulation of the hydrophilic properties of acrylic polymers containing side-chain azobenzene chromophores

1995 ◽  
Vol 73 (11) ◽  
pp. 1849-1854 ◽  
Author(s):  
Nicola Tirelli ◽  
Angelina Altomare ◽  
Roberto Solaro ◽  
Francesco Ciardelli
Keyword(s):  
Structural Parameters ◽  
Radical Copolymerization ◽  
Side Chain ◽  
Suspension Stability ◽  
Trans Form ◽  
Free Radical Copolymerization ◽  
Acrylic Polymers ◽  
Turbidimetric Method ◽  
Polymer Properties ◽  
Azobenzene Groups

Partially hydrophilic polymers have been prepared by free-radical copolymerization of trans-4-acryloyloxyazobenzene with N-tert-butylacrylamide and N-isopropylacrylamide. A turbidimetric method has been adapted to investigate the dependence of the polymer hydrophilic–hydrophobic balance on chemical composition and extent of photoisomerization of side-chain azobenzene chromophores. Irradiation at 366 nm of polymer suspension in THF–water induces the isomerization of azobenzene groups from the planar apolar trans form to the nonplanar polar cis form. Correspondingly, the solution turbidity is appreciably modified. Experimental results are discussed in terms of polymer structural parameters. Suspension stability and the possibility of carrying out photochemical cycles have been also investigated. Keywords: photochromic polymers, photoresponsive polymer, photomodulation of polymer properties, azobenzene-containing polymers, acryloyloxyazobenzene, N-tert-butylacrylamide.

Controlled/Living Free Radical Copolymerization of Styrene and Butyl Acrylate in Bulk and Emulsion with Industrial Monomers. Influence of Monomer Addition on Polymer Properties

2005 ◽  
Vol 44 (8) ◽  
pp. 2792-2801 ◽  
Author(s):  
Marvin R. Rivera ◽  
Angel A. Rodríguez-Hernández ◽  
Norma Hernández ◽  
Patricia Castillo ◽  
Enrique Saldívar ◽  
...  
Keyword(s):  
Free Radical ◽  
Butyl Acrylate ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Polymer Properties

scholarly journals Novel Self-Healing Metallocopolymers with Pendent 4-Phenyl-2,2′:6′,2″-terpyridine Ligand: Kinetic Studies and Mechanical Properties

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1760
Author(s):  
Rose K. Baimuratova ◽  
Gulzhian I. Dzhardimalieva ◽  
Evgeniy V. Vaganov ◽  
Valentina A. Lesnichaya ◽  
Gulsara D. Kugabaeva ◽  
...  
Keyword(s):  
Critical Role ◽  
Specific Effect ◽  
Kinetic Studies ◽  
Radical Copolymerization ◽  
Self Healing ◽  
Free Radical Copolymerization ◽  
Polymer Hydrogels ◽  
Close Proximity ◽  
Metal Group ◽  
Metal Polymer

We report here our successful attempt to obtain self-healing supramolecular hydrogels with new metal-containing monomers (MCMs) with pendent 4-phenyl-2,2′:6′,2″-terpyridine metal complexes as reversible moieties by free radical copolymerization of MCMs with vinyl monomers, such as acrylic acid and acrylamide. The resulting metal-polymer hydrogels demonstrate a developed system of hydrogen, coordination and electron-complementary π–π stacking interactions, which play a critical role in achieving self-healing. Kinetic data show that the addition of a third metal-containing comonomer to the system decreases the initial polymerization rate, which is due to the specific effect of the metal group located in close proximity of the active center on the growth of radicals.

High-pressure free-radical copolymerization of ethene and 2-ethylhexyl acrylate

1996 ◽  
Vol 197 (12) ◽  
pp. 4119-4134 ◽  
Author(s):  
Michael Buback ◽  
Thomas Dröge ◽  
Alex Van Herk ◽  
Frank-Olaf Mähling
Keyword(s):  
High Pressure ◽  
Free Radical ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization

In Vitro Mineralization and Cell Adhesion on Surface Modified Poly (2 - hydroxy ethyl methacrylate-co-methyl methacrylate

2006 ◽  
Vol 309-311 ◽  
pp. 493-496 ◽  
Author(s):  
G.S. Sailaja ◽  
T.V. Kumari ◽  
Yoshiyuki Yokogawa ◽  
H.K. Varma
Keyword(s):  
Cell Adhesion ◽  
Calcium Phosphate ◽  
Methyl Methacrylate ◽  
Radical Copolymerization ◽  
Sem Analysis ◽  
Free Radical Copolymerization ◽  
In Vitro Mineralization ◽  
Atr Spectroscopy ◽  
Surface Modified

Poly(2-hydroxyethyl methacrylate-co- methyl methacrylate) HM, was synthesized by free radical copolymerization, cross-linked with ethylene glycol dimethacrylate and phosphorylated. The phosphate coupling was ensured by ATR spectroscopy. The in vitro mineralization ability of the phosphorylated HM (designated as PHM) was investigated by studying the nucleation and growth of calcium phosphate on its surface by immersing in simulated body fluid (SBF) solution. The coating morphology was studied by SEM and the Ca/P ratio of the coating by EDX analysis. The cell adhesion behaviour of PHM was studied by seeding Human osteosarcoma (HOS) cells for one week followed by SEM analysis along with HM as control. It was observed that HOS cells exhibited biomineralization of calcium phosphate on the surface of HM as well as on PHM with a significantly higher amount on the surface of PHM as observed by von kossa staining method. The results show that PHM is capable of in vitro mineralization under simulated physiological condition, promotes cell adhesion by providing an excellent cell friendly surface and it exhibits biomineralization of calcium phosphate in presence of HOS cells.

Free Radical Copolymerization of Ethylene with Vinyl Acetate under Mild Conditions

2017 ◽  
Vol 50 (9) ◽  
pp. 3516-3523 ◽  
Author(s):  
A. Zarrouki ◽  
E. Espinosa ◽  
C. Boisson ◽  
V. Monteil
Keyword(s):  
Free Radical ◽  
Vinyl Acetate ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Mild Conditions

Adsorption Characteristics of Superplasticizer with Waste Plexiglas (WPS) onto Cement Particle Surface

2011 ◽  
Vol 328-330 ◽  
pp. 547-550
Author(s):  
Gang Zheng ◽  
Ru Min Wang ◽  
Gao Yang Zhao ◽  
Zhong Yu
Keyword(s):  
Physical Adsorption ◽  
Particle Surface ◽  
Radical Copolymerization ◽  
Cement Particle ◽  
Free Radical Copolymerization ◽  
Ζ Potential ◽  
Adsorption Characteristics ◽  
Adsorbed Quantity ◽  
Uv Visible ◽  
Repulsive Forces

In this study, by using UV-visible adsorption spectrophotometer, ζ-potential analyzer and X-ray photo spectroscopy, the adsorption characteristics and surface electrochemical properties of WPS were studied in comparison with traditional naphthalene sulfonated formaldehyde condensates (FDN) whose dispersion ability mainly depends on electrostatic repulsive forces. WPS was prepared through free radical copolymerization in self-Single screw reactive extruder and synthesized from waste plexiglas and vinyl monomers by way of special extrusion modification. The results show that the adsorption of WPS and FDN on cement particle surface approximately conforms to Langmuir’s adsorption isotherm. The adsorption of WPS belongs to physical adsorption and its saturated adsorbed quantity was 5.38mg/g. When the dosage of WPS was 1 wt.% of cement, the thickness of the adsorption layer on the surface of cement particles was 61.2 nm. The ζ-potential of cement particle with WPS changed from positive (15 mV) to negative (-64.74mV) with its concentration increasing from 0 to 20 g/L and decreased from -65.19 to-39.82 mV (reducing by 38.9%) with its concentration of 10 g/L within 60 h.

Synthesis and characterization of hyperbranched associative polyacrylamide

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39522-39529 ◽  
Author(s):  
Wanfen Pu ◽  
Daijun Du ◽  
Rui Liu ◽  
Jiongyi Gu ◽  
Kewei Li ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Copolymerization ◽  
Synthesis And Characterization ◽  
Functional Monomer ◽  
Free Radical Copolymerization ◽  
Ultrafine Silica ◽  
Hyperbranched Polyamide

HDPAM was synthesized by water free-radical copolymerization based on functional hyperbranched polyamide-modified ultrafine silica as functional monomer.

Synthesis and characterization of amphiphilic graft copolymers with hydrophobic poly(α-methylstyrene) backbone and hydrophilic poly(n-vinylpyrrolidone) side chains

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Fatima Zohra Sebba ◽  
Seghier Ould Kada ◽  
Mohamed Benaicha ◽  
Nerjesse Nemiche
Keyword(s):  
Graft Copolymer ◽  
Graft Copolymers ◽  
Radical Copolymerization ◽  
Side Chains ◽  
Free Radical Copolymerization ◽  
Good Efficiency ◽  
Molecular Weights ◽  
Grafting Reaction ◽  
Viscosity Variation ◽  
End Capping

AbstractIn this study, 2-oxopropylmethacrylate-terminated poly(N-vinyl-2- pyrrolidone) is produced by cationic polymerization using HClO4 as an initiator. Termination (end capping) step is accomplished using 2- hydroxypropylmethacrylate (2HPMA) and the polymer product has different chain lengths of molecular weight averages ranging from 672 to 3049 g/mol. The study also synthesised amphipathic graft copolymers having hydrophobic poly(α- methylstyrene) as a backbone chain and hydrophilic poly(N-vinyl-2-pyrrolidone) (PVP) as side chains of various lengths. The copolymer synthesis was accomplished by free radical copolymerization of ω-oxopropylmethacrylate PVP in the presence of α-methyl styrene initiated with benzoyl peroxide. Measurements of the dynamic viscosity of the polymer solution (20% weight of macromonomers in ethanol) show that the viscosity is proportional to the average molecular weights M̅n . However, a reverse behaviour of the viscosity variation with regard to M̅n is observed for graft copolymer samples. The viscosity variation with respect to the graft copolymer mass must be due to steric effects, which are strongly pronounced in grafted copolymer chains. Appearance of the number of side chains attached to poly(α-methylstyrene) backbone reveals that the grafting reaction has occurred with good efficiency.

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