Functionalization of Graft Copolymers of Poly (Ethyl Acrylate) and Cellulose by Post Polymer Reactions to Develop Reactive Metal Ion Sorbents

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.

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Synthesis and Evaluation of Advanced Graft Copolymers

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/147776061202800103 ◽

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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Synthesis and Characterization of Reactive Graft Copolymers of Poly(butyl Acrylate) and Cellulose

Polymers and Polymer Composites ◽

10.1177/096739110501300504 ◽

2005 ◽

Vol 13 (5) ◽

pp. 467-478

Author(s):

Ghanshyam S. Chauhan ◽

Baljit Singh ◽

Suresh Kumar ◽

Anupama Chinkara

Keyword(s):

Butyl Acrylate ◽

Metal Ion ◽

Graft Copolymerization ◽

Graft Copolymers ◽

Optimum Conditions ◽

Ion Sorption ◽

Graft Yield ◽

Ft Ir ◽

Structural Aspects

Butyl acrylate was graft copolymerized onto cellulose extracted from pine needles by a simultaneous gamma radiation initiation method. Optimum conditions for the maximum graft yield were established. Polymerization and grafting parameters such as %grafting (Pg), % grafting efficiency (%GE), rates of polymerization (Rp), homopolymerization (Rh) and graft copolymerization (Rg) were also determined. Grafted cellulose was further functionalized to produce poly(acryloyl hydroxylamine) [Cell-g-poly(CONHOH)] so as to generate active (-CONHOH) groups on the cellulose backbone. Graft copolymers were characterized by elemental analysis, by FT-IR and by a swelling study. An attempt was also made to study the sorption of Fe+2 and Cu+2 as model metal ions onto the candidate copolymers, in order to investigate their selectivity in metal ion sorption and to determine the effect on metal ion sorption of the structural aspects of the hydrogels and other functionalized graft copolymers, so as to identify their end-uses.

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