| The plastic is closely related to people's life, but the large use of it causes serious environmental pollution problems. Along with the increasing importance of environmental protection, how to develop plastic products as well as ensuring environmental protection have aroused widely concern of researchers. This thesis mainly deals with plastic degradation, and strives for a breakthrough in the new technology.The process of plastic degradation mainly involves the biodegradation, photodegradation and chemical degradation. They work effectively and collectively between each other. This paper focuses on the photodegradation, using metallocene linear low density polyethylene (m-LLDPE), putting three different species (CoSt, FeSt, FeDEC) and different proportions of photosensitizer respectively, and testing, in order to understanding the m-LLDPE film photodegradation characteristics. Through the experiment, we can get conclusions that with the increased of the content of photosensitizer, the carbonyl index of m-LLDPE film is strengthening gradually. So the photosensitizer make a very important role in the oxidation degradation reaction. It will strengthen degradation efficiency.Meanwhi, this paper also discussed the effect of the dosage of photosensitizer,the time of 60Co-γirradiation and the distance form irradiation center on crosslinking properties. The results showed that the gel content and crosslinking degree of m-LLDPE has been improved under the 60Co-γirradiation. The maximum temperature and mechanical properties of m-LLDPE can be improved by cross-linked. It also can enlarge the application range and meet the market requirements.The method of cross-linking was an simple way for production and it was effective for solving the problem of plastic pollution. Moreover, it is valid for sustainable development. |
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