Synthesis And Applied Research On Low Temperature Controlled Photothermal Degradation Of Polyethylene Films

All the works of this research were supported by the Xinjiang Science and Technology Department "Desertification Combat Series of Drip Irrigation Fertilizer Industry " Project.In this study, two kinds of thermal catalyst NiCoMnO4 and NTC were selected,which were putting into the polyethylene ground film for farm, studied systematically membrane the degradation property under different temperature, illumination time and at different temperature and illumination.Meanwhile in order to realize the controllability of mulch by compound with three kinds of catalysts. It was the hope that this research may offer some references and guidance for the industrial manufacture. The main results were as follows:1. Two kinds of catalysts in the cyclic voltammograms showed that the NiCoMnO4 and NTC electrode reaction in phosphate buffer was diffusion controlled and the process was quasi-reversible and it didn’t change in different temperature. The CVs of electro-catalytic oxidation of hydrogen peroxide at the two catalyst electrode showed that the catalytic effects on hydrogen peroxide were irreversible. Catalytic efficiency was higher with the temperature raise. In dealing with a temperature of 60 ℃ REDOX peak potential difference reaches maximum value,the potential difference raise from 0.212 V to 0.337 V.2. The catalytic efficiency was highest when 0.5% NiCoMnO4 and NTC were added in the film, the retention rate of elongation decline to 10% at 60℃ after disposing 42 d and 87 d, degree of crystallinity was ascend from 34.32 to 38.59、from 34.1 to 37.46. Carbonyl absorption peak appeared in the infrared spectrum at the time of oxidation degradation of 90 d, the absorption peak was becoming more and more strong with the extension of processing time.The SEM showed that after degradation the surface of the film became rough, maximum height difference. NiCoMnO4’ Catalytic efficiency was higher than that NTC’, so NiCoMnO4 was a more excellent catalyst.3. Under the highlights of 19W*6 with 192 h,60℃, NiCo MnO4 and NTC film’ weightlessness rate under low light intensity increased by 0.92% and 2.11% respectively. Infrared spectrum showed through 60 ℃ highlights strong processing of degradable mulching film had more oxidation product. Surface morphology of samples under the condition of strong specular and high temperature when handling 192 h,the damage was more serious, the holes appared.4. The degradating effect was the most significant by adding NiCoMnO4 polyethylene mulch in environment.0.5% NiCoMnO4 polyethylene mulch’ retention rate of elongation was dropped to below 10% in 54 d. NTC’degradation in the environment to be weaker than NiCoMnO4’s.NDBC used alone in the process of environmental aging proof role, used with NiCoMnO4 can lengthen polyethylene mulch degradation induction period, but in the later and accelerated the degradation of the membrane, used with the NTC was less than the degradation of cycle used with NiCoMnO4 degradation period. Through three kinds of catalyst distribution, plastic film which was prepared in the real natural conditions can meet the demand of different parts of the degradation of environmental degradation of membrane.