| Project/Area Number |
09680546
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
環境保全
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| Research Institution | Nagoya University |
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Principal Investigator |
TORIKAI Ayako Grad.School of Eng., Nagoya Univ., Assist.Professor, 大学院・工学研究科, 講師 (50023122)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Keywords | Waste Plastics / Photodegradation / Accelerated degradation / Sunlight / Environment |
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| Research Abstract |
Organic polymeric materials are widely used in various industrial fields and the need for these materials are increasing. As a result, waste plastics are increasing. Recycling, combustion and landfill are the main methods of treating these waste plastics. However recycling is limited to some special plastics, combustion has problems that toxic gas such as halogen are released into the air. Landfill is environmentally acceptable but available landfill is limited and plastic does not decompose in soil. From our previous studies, we have known that the accelerated photodegradation of plastics can occur under the suitable conditions. If accelerated photodegradation can take place under the terrestrial sunlight, this method will become an excellent one for the degradation of waste plastics. We have studied the accelerated photodegradation of polymethylmethacrylate(PMMA), polystyrene(PSt) and Polyvinylchloride
(PVC) as plastis by introducing chromophores as an additive or an abnormal bond into the plastics.. Changes in chemical structure and molecular weight by photo-simulated irradiation were studied and the following results were obtained.
1) Accelerated photodegradationod these plastics under long wavelength radiation (simulating terrestrial sunlight) wwas observed.
2) The threshold wavelengths for main-chain scission of these plastics shift to longer wavelength under the conditions for accelerated degradation.
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