[口头报告]Novel environmentally friendly covalent organic frame-work/polylactic acid composite material with high chemical stability for sand control material

Novel environmentally friendly covalent organic frame-work/polylactic acid composite material with high chemical stability for sand control material
编号:2417 稿件编号:1990 访问权限:私有 更新:2023-04-11 19:12:31 浏览:916次 口头报告

报告开始:2023年05月06日 16:25 (Asia/Shanghai)

报告时间:10min

所在会议:[12] 12、地表过程与地貌 » [12-1] 12-1 地表过程与地貌

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摘要
A new high-strength, thermally stable, and degradable covalent organic framework (COF) -modified polylactic acid fiber (PLA) material (COF-PLA) was constructed for reinforcing the PLA material, to be used to produce environmentally-friendly sand barriers. The micrographs, structure, thermal stability, and photodegradation products of COF-PLA were investigated. The results indicated that the COF material was compatible with PLA, and that the COF-PLA material took on the merits of the COF, so that it had a more regular arrangement, smoother surface, smaller size, and was more thermostable than PLA alone. The successful incorporation of the COF improved the thermal stability of PLA. The initial pyrolysis temperature of COF-PLA material is 313.7℃, higher than that of PLA material at 297.5 ℃. The photodegradation products of COF-PLA and PLA indicated that the COF and PLA materials were mixed in a complex manner. After photodegradation, the COF-PLA material can produce melamine molecules that can neutralize the lactic acid and CO2 produced by PLA, which can maintain the acid-base balance in sandy soil and is beneficial to plant growth. Therefore, COF-PLA degradation does not cause pollution, making it a promising sand-control material.
 
关键字
covalent organic framework; polylactic acid; sand control materials; thermal stability; environ-mentally friendly
报告人
杨婉佳
中科院西北生态环境资源研究院

稿件作者
杨婉佳 中科院西北生态环境资源研究院
柳本立 中国科学院西北生态环境资源研究院
杜永令 兰州大学
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