Graft copolymerization of ethyl acrylate with alkyl methacrylates onto amylose initiated by cerium (IV). Microstructure of graft copolymers with respect to statistical copolymers

Polymer ◽  
1994 ◽  
Vol 35 (7) ◽  
pp. 1535-1541 ◽  
Author(s):  
Isabel Goñi ◽  
Mariló Gurruchaga ◽  
Blanca Vázquez ◽  
Miguel Valero ◽  
Gonzalo Martín Guzmán ◽  
...  
Keyword(s):  
Graft Copolymerization ◽  
Graft Copolymers ◽  
Ethyl Acrylate ◽  
Alkyl Methacrylates

Association of Graft Copolymers of Alkyl Methacrylates with α-Methyl-ω-hydroxy-poly(oxyethylene) ethacrylates

1995 ◽  
Vol 60 (11) ◽  
pp. 1971-1985 ◽  
Author(s):  
Čestmír Koňák ◽  
Zdeněk Tuzar ◽  
Pavla Kopečková ◽  
Joseph D. Andrade ◽  
Jindřich Kopeček
Keyword(s):  
Light Scattering ◽  
Graft Copolymers ◽  
Water Solution ◽  
Pure Water ◽  
Solution Properties ◽  
Monomer Composition ◽  
Special Procedure ◽  
Methyl Cellosolve ◽  
Hexyl Methacrylate ◽  
Alkyl Methacrylates

Solution properties of the statistical copolymers of alkyl methacrylates (AMA) with α-methyl-ω-hydroxy-poly(oxyethylene) methacrylates (MPOEMA) (nonionic polysoaps) were studied using static and dynamic ligh scattering as a function of monomer composition and concentration in aqueous and methyl cellosolve solutions. The solubility of the copolymers in water was found to be dependent on molar contant of AMA. While copolymers with low content of hexyl methacrylate (HMA) (0 and 20 mole %) were directly soluble in water, forming true solutions with a low content of large swollen aggregates, copolymers with a higher content of HMA or lauryl methacrylate (LMA) were not directly dispersable in water. A special procedure, the stepwise dialysis from methyl cellosolve solutions against water, had to be used to prepare them in the pseudomicellar form. The copolymers were directly soluble in methyl cellosolve and its water solution containing up to 60 vol.% of water. Nevertheless, the light scattering experiments were dominated by light scattering of swollen particles of aggregated copolymer molecules. The copolymers were not soluble in the mixtures containing 70-100 vol.% of water. Paramaters of aggregates in the mixture with 60 vol.% of water and in pure water were found to be very similar.

scholarly journals Evaluation of Dynamic Materials Procured from Waste Biomass

2011 ◽  
Vol 2011 ◽  
pp. 1-7
Author(s):  
Ashish Chauhan ◽  
Balbir Kaith
Keyword(s):  
Moisture Absorption ◽  
Chemical Resistance ◽  
Phenol Formaldehyde ◽  
Graft Copolymers ◽  
Ethyl Acrylate ◽  
Industrial Applications ◽  
Modulus Of Rupture ◽  
Waste Biomass ◽  
Dynamic Materials ◽  
Physico Chemical

Methyl acrylate (MA) monomer was graft copolymerized onto Hibiscus sabdariffa stem fiber and used to explore the additive effect of vinyl acrylate (VA) and ethyl acrylate (EA) on percentage grafting and the properties of the fiber, in binary vinyl monomeric mixtures. The graft copolymers were reinforced into phenol-formaldehyde polymer matrix to form biocomposites and characterized by FTIR, XRD, TGA, DTA, and SEM techniques. They were evaluated for physico-chemical changes in properties like moisture absorption at different relative humidity levels and chemical resistance against 1 N NaOH and 1 N HCl. These graft copolymers-reinforced biocomposites had higher mechanical strength like hardness, modulus of rupture, modulus of elasticity, and stress at the limit of proportionality. These novel materials can have numerous scientific and industrial applications for the development of technology.

Synthesis and Evaluation of Advanced Graft Copolymers

2012 ◽  
Vol 28 (1) ◽  
pp. 27-42
Author(s):  
Ashish Chauhan ◽  
Balbir Kaith
Keyword(s):  
Moisture Absorption ◽  
Graft Copolymers ◽  
Gentian Violet ◽  
Monomer Concentration ◽  
Crystallinity Index ◽  
Ethyl Acrylate ◽  
Ceric Ammonium Nitrate ◽  
Waste Biomass ◽  
Graft Yield ◽  
Xrd Techniques

The paper deals with characterisation and evaluation of the transformations in waste biomass Hibiscus sabdariffa stem fibre on graft copolymerisation with ethyl acrylate (EA) and butyl acrylate (BA) monomer, using a ceric ammonium nitrate–nitric acid initiator system. Different reaction parameters, such as temperature, time, initiator concentration, monomer concentration, and pH, were optimised to obtain the maximum graft yield. The graft copolymers thus formed were characterised by FTIR, SEM, TGA, DTA, and XRD techniques. The swelling behaviour of graft copolymers in different solvents was studied and screened for dye uptake behaviour in 0.1% gentian violet dye. With increase in percentage grafting, the percentage crystallinity, crystallinity index, and moisture absorption were found to decrease, whereas the chemical resistance (against 1N HCl and 1N NaOH), thermal resistance, and solubility in organic solvents were found to increase.

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