Radiation-Induced Graft Copolymerization of Methyl Acrylate and Acrylic Acid onto Rubber Wood Fiber
Graft copolymerization of methyl acrylate and acrylic acid monomers onto rubber wood fiber (RWF) was carried out by simultaneous radiation-induced technique. The parameters affecting the grafting reaction were investigated and the optimum conditions for both monomers obtained are as follows: impr...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9367/1/FSAS_2002_12_A.pdf |
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| Summary: | Graft copolymerization of methyl acrylate and acrylic acid monomers onto rubber
wood fiber (RWF) was carried out by simultaneous radiation-induced technique.
The parameters affecting the grafting reaction were investigated and the optimum
conditions for both monomers obtained are as follows: impregnation time, 16
hours; total dose, 30 kGy; methanol:water ratio, 3: 1 ; monomers concentration, 40
v/v% and sulphuric acid concentration, 0.1 mol/L.
Fourier Transform Infrared (FTIR), Thermogravimetry Analysis (TGA), and
Scanning Electron Microscope (SEM) analyses were performed to characterize
graft copolymers. The structural investigation by X-ray diffraction (XRD) shows
the degree of crystallinity of rubber wood fiber decreased with the incorporation of
poly(methyl acrylate) and poly(acrylic acid) grafts which causes partial destruction
of the inherent crystallinity in fiber. The sorption behavior of poly(acrylic acid)-
grafted RWF resin toward some metal ions was investigated using a batch
technique. The binding capacities ofeu, Fe, Zn, Cd and Pb ions were 0.379, 0.795, 0.189, 0.921 and 1.218 mmol/g, respectively. The sorption capacities of
poly(acrylic acid)-grafted RWF resin were selectivity toward these metal ions is in
the following order: Pb > Cd> Fe > Cu > Zn.
Irradiated PP/poly(methyl acrylate)-grafted RWF composite has higher mechanical
properties than PP/poly(methyl acrylate)-grafted RWF composite because of EB treatment
of PP is a highly efficient technique of creating chemically active sites
on PP matrix, which created a better coupling, and can be proved by SEM studies
and TGA analysis. Generally, the addition of poly(methyl acrylate)-grafted RWF
as coupling agent into the composites reduces the flexural and tensile properties,
which, causes poor and incompatible dispersion, which leads to poor filler-matrix
interfacial bonding. But, the addition of 1.0 wt % of P(MA)-g-RWF into the blend
give an optimum value of flexural and tensile properties. |
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