scholarly journals Homogeneous Graft Copolymerization of Vinyl Monomers onto Cellulose in a Dimethyl Sulfoxide–Paraformaldehyde Solvent System II. Characterization of Graft Copolymers

1983 ◽  
Vol 15 (2) ◽  
pp. 153-158 ◽  
Author(s):  
Noboru Nishioka ◽  
Keiji Matsumoto ◽  
Kouichi Kosai
Keyword(s):  
Dimethyl Sulfoxide ◽  
Graft Copolymerization ◽  
Graft Copolymers ◽  
Solvent System ◽  
Vinyl Monomers

scholarly journals Homogeneous Graft Copolymerization of Vinyl Monomers onto Cellulose in a Dimethyl Sulfoxide–Paraformaldehyde Solvent System IV. 2-Hydroxyethyl Methacrylate

1986 ◽  
Vol 18 (4) ◽  
pp. 323-330 ◽  
Author(s):  
Noboru Nishioka ◽  
Yoshiyuki Matsumoto ◽  
Toshiyuki Yumen ◽  
Kouji Monmae ◽  
Kouichi Kosai
Keyword(s):  
Dimethyl Sulfoxide ◽  
Graft Copolymerization ◽  
Solvent System ◽  
Vinyl Monomers ◽  
Hydroxyethyl Methacrylate

The Separation and Characterization of Graft Copolymers from Natural Rubber

1958 ◽  
Vol 31 (4) ◽  
pp. 819-828 ◽  
Author(s):  
F. M. Merret
Keyword(s):  
Natural Rubber ◽  
Intrinsic Viscosity ◽  
Benzene Solution ◽  
Graft Copolymers ◽  
General Pattern ◽  
The Other ◽  
Vinyl Monomers ◽  
Major Increase ◽  
Made In

Abstract The solubility of graft copolymers prepared from rubber and vinyl monomers follows a general pattern whereby one of the constituents can be insolubilized while the other remains soluble, the compound forming a stable sol which is largely unaffected by heat or ionic materials at suitable ratios of solvent to precipitant. The onset and flocculation of the sol are such that the graft copolymer can be completely separated from either free constituent homopolymer. This insolubilization of the rubber trunk chain by addition of methanol to a benzene solution of the coploymer has been followed by the changes in the intrinsic viscosity and turbidity, which show that the collapse of the rubber chain continues to a point beyond where the molecularly equivalent free rubber would be precipitated. This period also marks the major increase in turbidity. Osmotic data show that μ-values for the grafted copolymers of rubber are the same as for rubber itself, thus supporting similar assumptions made in the application of the theory of the equilibirium swelling of crosslinked rubber.

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

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.

A Study of Crystallinity of Graft Copolymers of Flax Fiber with Binary Vinyl Monomers

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
B.S. Kaith ◽  
Susheel Kalia
Keyword(s):  
Binary Mixture ◽  
Graft Copolymerization ◽  
Graft Copolymers ◽  
Crystallinity Index ◽  
Vinyl Monomer ◽  
Flax Fiber ◽  
Vinyl Monomers ◽  
X Ray Diffraction ◽  
X Ray

AbstractThe present paper deals with graft copolymerization of binary vinyl monomer mixtures onto flax fiber. Maximum grafting (86.02 %) has been found with MMA+EA binary mixture. Percentage crystallinity and crystallinity index of graft copolymers were measured with X-ray diffraction (XRD) technique. Crystallinity of flax decreases on grafting with binary vinyl monomer mixtures. Flax showed the highest value of percentage crystallinity (76.96 %) and crystallinity index (0.7005) in comparison to Flax-g-copolymers.

Radiation Induced Graft Copolymerization of Methyl Acrylate and Ethyl Acrylate onto Poly(tetrafluoroethylene-co-ethylene) Film

2002 ◽  
Vol 10 (5) ◽  
pp. 391-404 ◽  
Author(s):  
Inderjeet Kaur ◽  
B. N. Misra ◽  
Raj Kumar ◽  
Baljit Singh
Keyword(s):  
Thermogravimetric Analysis ◽  
Ir Spectroscopy ◽  
Thermal Resistance ◽  
Methyl Acrylate ◽  
Graft Copolymerization ◽  
Ethyl Acrylate ◽  
Vinyl Monomers ◽  
Optimum Conditions ◽  
Radiation Induced

To introduce functional moieties into Tefzel® film, a copolymer of tetrafluoroethylene and ethylene, graft copolymerization of vinyl monomers such as methyl acrylate (MA) and ethyl acrylate (EA) was attempted by a pre-irradiation method in aqueous medium. Optimum conditions for obtaining the maximum grafting was evaluated for both monomers. Maximum grafting of MA (306.0%) and EA (462.1%) was obtained at a total dose of 25.4 and 31.9kGy respectively, using [MA] = 2.20 mol/L and [EA] 0.032 moles. The effect of aliphatic alcohols of varying chain length, such as methanol, ethanol, n-butanol, 1-Pentanol and cyclohexanol on the percentage grafting of MA & EA was also studied. Characterization of Tefzel® and grafted Tefzel® films was carried out by IR spectroscopy and thermogravimetric analysis. Grafted Tefzel® film was found to have improved thermal resistance.

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