Preparation and Characterization of Poly(Methyl Methacrylate) Grafted Sago Starch
The graft copolymerization of poly(methyl methacrylate) (PMMA) onto sago starch (sago starch-g-PMMA) was carried out using ceric ammonium nitrate (CAN) and potassium persulfate (PPS) as initiators. PMMA was first grafted onto sago starch using CAN as an initiator under nitrogen gas atmosphere. T...
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| 格式: | Thesis |
| 语言: | English English |
| 出版: |
1999
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| 主题: | |
| 在线阅读: | http://psasir.upm.edu.my/id/eprint/9487/1/FSAS_1999_29_A.pdf |
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| 总结: | The graft copolymerization of poly(methyl methacrylate) (PMMA)
onto sago starch (sago starch-g-PMMA) was carried out using ceric
ammonium nitrate (CAN) and potassium persulfate (PPS) as
initiators. PMMA was first grafted onto sago starch using CAN as an
initiator under nitrogen gas atmosphere. The maximum percentage of
grafting (%G) was detennined to be 2460/0 when the optimum
conditions (reaction temperature: 70 DC, reaction period: 2 hrs, the
amount of CAN: 2.0 mmoles, the amount of nitric acid: 0.4 mmoles,
and the amount of methyl methacrylate (MMA): 141 mmoles). When
PPS was used as an initiator, the maximum % G achieved was 900/0.
The optimum conditions for this initiator were as follows: reaction temperature: 50 oC, the amount of monomer: 47 mmoles, the amount
of PPS: 1.82 mmoles, and reaction period: 1.5 hr.
The copolymers produced were characterized by Fourier
Transform Infrared Spectrophotometry (FTIR) , differential scanning
calorimetry (DSC), and thermogravimetric analysis (TGA). 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. DSC and
TGA thermograrns showed that the copolymerization products were
made up of two different polymers.
The copolymers of vanous percentages of grafting were
hydrolysed with 0.5 M hydrochloric acid and the viscosity
measurements of PMMA produced were carried out using Ubbelohde
viscometer. The average molecular weight (Mv) of PMMA grafted onto
the sago starch (2460/0G) prepared by using CAN as the initiator was
4.3xlO4, and from PMMA grafted sago starch (900/00) prepared by
using PPS as the initiator was 1.3x 104.
Biodegradability studies of sago starch-g-PMMA and sago
starch were carried out by a-amylase enzyme. The rate of degradation of sago starch was higher than the rate of degradation of sago starchg-
PMMA. Maximum biodegradation of the sago starch was achieved
after 3 days of incubation, while for the copolymer was 7 days. |
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