|Table of Contents|

Natural Aging and Degradation Behaviors of the Three Kinds of Typical Plastic Agricultural Films in Water Environment(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2023年02期
Page:
131-139
Research Field:
环境科学与工程
Publishing date:

Info

Title:
Natural Aging and Degradation Behaviors of the Three Kinds of Typical Plastic Agricultural Films in Water Environment
Author(s):
Wang Lihe1; 2; Li Jining1; 2; Qiu Jinli1; 2; Wang Fenghe1; 2
(1.School of Environment,Nanjing Normal University,Nanjing 210023,China)
(2.Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology,Nanjing 210023,China)
Keywords:
plastic agricultural films;  natural aging;  degradation;  water environment
PACS:
X71
DOI:
10.3969/j.issn.1001-4616.2023.02.017
Abstract:
In this paper, Polylactic acid(PLA), Calcium carbonate filled polyethylene(CCF-PE)and Polyethylene(PE)plastic agricultural films were used as research materials, and the aging and degradation experiments were carried out by natural outdoor exposure, using Fourier Transform Infrared Spectroscopy(FTIR), Electromechanical Universal Testing Machine, Scanning Electron Microscope(SEM)and other characterization methods to analyze the structure and properties of the three kinds of typical plastic agricultural films and study the aging and degradation behaviors of them in water environment for 180 days. The results showed that the mass loss rate of PLA and CCF-PE agricultural films increase rapidly in the first two months of the experiment, and then the increasing trend slowed down with the extension of time. However, PE agricultural films maintained a gentle rise. In the degradation process of three kinds of plastic agricultural films, the risk of water organic pollution and micro- and nano-plastic pollution was increasing. The breaking elongation rate and the tensile strength of three kinds of plastic agricultural films decreased and the mechanical properties followed the order of PE films>PLA films>CCF-PE films after 180 days of aging and degradation. The original surface of three kinds of plastic agricultural films was flat and smooth, without holes and cracks, but after 180 days of aging and degradation, cracks appeared on the surface of PLA and PE agricultural films and holes appeared on the surface of CCF-PE agricultural films. The intensity of all the specific peaks of three kinds of plastic agricultural films decreased, which indicated that the molecular chains were broken and the molecular weights were decreasing. PLA agricultural films were mainly photodegraded. The CO2-3 characteristic peaks of CCF-PE agricultural films were greatly reduced, and —CH2 in PE agricultural films were involved in the oxidation reaction.

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Last Update: 2023-06-15