scholarly journals BIODEGRADATION BEHAVIOR OF POLY(METHYL METHACRYLATE) GRAFTED SAGO STARCH BIOPOLYMER

2010 ◽  
Vol 8 (2) ◽  
pp. 37-45
Author(s):  
Isam Yassin Qudsieh
Keyword(s):  
Fourier Transform ◽  
Methyl Methacrylate ◽  
Graft Copolymerization ◽  
Ceric Ammonium Nitrate ◽  
Sago Starch ◽  
Infrared Spectrophotometry ◽  
Optimum Conditions ◽  
Nitrogen Gas ◽  
Poly Methyl Methacrylate ◽  
Gas Atmosphere

The graft copolymerization of poly(methyl methacrylate) (PMMA) onto sago starch (sago starch-g-PMMA) was carried out using ceric ammonium nitrate (CAN) as an initiator. PMMA was grafted onto sago starch using CAN as an initiator under nitrogen gas atmosphere. The maximum percentage of grafting (%G) was determined to be 246% at the optimum conditions. The copolymers produced were characterized by Fourier Transform Infrared Spectrophotometry (FTIR), The FTIR spectra of the copolymers clearly indicated the presence of characteristic peaks of PMMA and sago starch, which suggested that PMMA had been successfully grafted on the sago starch. Biodegradability studies of sago starch-g-PMMA and sago starch were carried out by ?-amylase enzyme. Maximum biodegradation of the biopolymer was achieved after 3 days of incubation, while for the product was 7 days. The maximum production of glucose was achieved when the concentration of -amylase was 50 ppm.

Graft copolymerization of methyl methacrylate onto sago starch using ceric ammonium nitrate and potassium persulfate as redox initiator systems

2002 ◽  
Vol 83 (10) ◽  
pp. 2275-2275
Author(s):  
Isam Y. M. Qudsieh ◽  
Wan Md Zin Wan Yunus ◽  
Fakhru'l-Razi A. ◽  
Mansor B. Ahmad ◽  
Mohamad Zaki Ab. Rahman
Keyword(s):  
Methyl Methacrylate ◽  
Ammonium Nitrate ◽  
Graft Copolymerization ◽  
Potassium Persulfate ◽  
Ceric Ammonium Nitrate ◽  
Sago Starch ◽  
Redox Initiator

Graft copolymerization of methyl methacrylate onto sago starch using ceric ammonium nitrate and potassium persulfate as redox initiator systems

2001 ◽  
Vol 82 (6) ◽  
pp. 1375-1381 ◽  
Author(s):  
A. Fakhru'L-Razi ◽  
Isam Y. M. Qudsieh ◽  
Wan Md Zin Wan Yunus ◽  
Mansor B. Ahmad ◽  
Mohamad Zaki Ab. Rahman
Keyword(s):  
Methyl Methacrylate ◽  
Ammonium Nitrate ◽  
Graft Copolymerization ◽  
Potassium Persulfate ◽  
Ceric Ammonium Nitrate ◽  
Sago Starch ◽  
Redox Initiator

Graft copolymerization of poly(vinyl acetate) onto starch using KMnO4-H2SO4 redox system

2013 ◽  
Vol 33 (6) ◽  
pp. 521-526 ◽  
Author(s):  
Baohan Qu ◽  
Hongchun Li ◽  
Yongsheng Niu
Keyword(s):  
Ir Spectra ◽  
Vinyl Acetate ◽  
Graft Copolymerization ◽  
Redox System ◽  
Biodegradable Plastic ◽  
Sago Starch ◽  
Optimum Conditions ◽  
Swelling Power ◽  
Graft Yield

Abstract The graft copolymerization of poly(vinyl acetate) [poly(VAc)] onto starch was studied using the KMnO4-H2SO4 redox system. The grafting parameters are favored by changing the concentration of KMnO4, the concentration of acid, the temperature, the time, and the concentration of monomer. A maximum graft yield of 38.3% was obtained at optimum conditions: KMnO4 concentration=3.0×10-3 mol/l, concentration of acid=1.5×10-2 mol/l, temperature=40°C, time=3 h, and concentration of monomer=1 mol/l. The grafting of poly(VAc) onto starch was confirmed by the IR spectra of pure sago starch, poly(VAc), and poly(VAc) grafted starch. Both swelling power and solubility increased with the increase in temperature. Graft copolymerization increased swelling power and reduced solubility. This material may have use as an application as a biodegradable plastic.

Effect of Ba Strate Addition on Magnetic Properties of Ba-System W-Type Ferrite Magnets

2007 ◽  
Vol 534-536 ◽  
pp. 1305-1308
Author(s):  
Hiroshi Yamamoto ◽  
Hiroaki Nishio ◽  
Yoshihito Sawayama
Keyword(s):  
Magnetic Properties ◽  
Chemical Composition ◽  
Physical Properties ◽  
Optimum Conditions ◽  
Nitrogen Gas ◽  
Lattice Constants ◽  
Typical Sample ◽  
Gas Atmosphere ◽  
Drying Condition ◽  
Sintering Condition

Experiment was carried out to investigate the effect of Ba Stearate as a reducing agent on the magnetic and physical properties of anisotropic BaFe2-W type ferrite magnets. It was found that the magnetic properties of BaO･8.5Fe2O3 were improved by adding 0.3 wt% of Ba Stearate, 0.5 wt% of SiO2, and 0.5 wt% of CaO together. The optimum conditions for making magnets were as follows; chemical composition: Ba1.029Ca0.127Si0.097C0.053Fe2+ 2.456Fe3+ 15.392O27, semisintering condition: 1350 °C×4.0 h in nitrogen gas atmosphere, drying condition: 180 °C×2.0 h in air, sintering condition: 1160 °C×1.5 h in nitrogen gas atmosphere. Magnetic and physical properties of a typical sample were Jm = 0.46 T, Jr = 0.43 T, HcJ = 182.3 kA/m, HcB = 177.2 kA/m, (BH)max = 33.8 kJ/m3, TC = 495 °C and KA = 2.65×105 J/m3 and HA = 1332 kA/m. The lattice constants of this compound were a = 5.883×10-10 m, c = 32.92×10-10 m, and c/a = 5.596.

Infrared Spectra of Poly(Methyl Methacrylate) Labeled with Oxygen-18

1979 ◽  
Vol 33 (6) ◽  
pp. 551-555 ◽  
Author(s):  
Stoil Dirlikov ◽  
Jack L. Koenig
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Infrared Spectrum ◽  
Methyl Methacrylate ◽  
Fourier Transform Infrared Spectroscopy ◽  
Infrared Spectra ◽  
Fourier Transform Infrared ◽  
Simple Method ◽  
Poly Methyl Methacrylate ◽  
The Fourier Transform

Fourier transform infrared spectrum of atactic poly(methyl methacrylate) (PMMA) is compared with that of atactic PMMA labeled with 18O in the ester groups. The results obtained define the assignment of the bands associated with vibrations of the ester groups of PMMA. Furthermore, the Fourier transform infrared spectroscopy provides a simple method for obtaining the spectra of “pure” derivatives containing 18O.

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