共 54 条
Enhanced degradation of poly(ethylene terephthalate) by the addition of lactic acid/glycolic acid: composting degradation, seawater degradation behavior and comparison of degradation mechanism
被引:28
作者:
Liu, Tian-Yuan
[1
,2
]
Xu, Peng-Yuan
[1
,2
]
Huang, Dan
[1
,3
]
Lu, Bo
[1
,3
]
Zhen, Zhi-Chao
[1
,3
]
Zheng, Wei-Zhen
[1
,2
]
Dong, Yan-Chao
[1
,2
]
Li, Xiao
[1
,2
]
Wang, Ge-Xia
[1
,3
]
Ji, Jun-Hui
[1
,3
]
机构:
[1] Chinese Acad Sci, Tech Inst Phys & Chem, Natl Engn Res Ctr Engn Plast & Ecol Plast, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Hainan Degradable Plast Technol Innovat Ctr, Haikou 571137, Peoples R China
基金:
中国国家自然科学基金;
关键词:
PET;
Hydroxy acid;
Improved degradation performance;
Compost degradation;
Seawater degradation;
HYDROLYTIC DEGRADATION;
BIODEGRADABLE COPOLYESTERS;
ETHYLENE-GLYCOL;
COPOLYMERS;
ROADMAP;
FUTURE;
PET;
D O I:
10.1016/j.jhazmat.2022.130670
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
The degradability improvement of poly(ethylene terephthalate) (PET), one of the most widely used but nondegradable disposable packaging material, is of great significance. However, the balance between degradability and mechanical properties remains a huge challenge. Herein, simple hydroxy acids, lactic acid (LA) and glycolic acid (GA) as easy hydrolysis sites were introduced into non-degradable PET via melt polycondensation. A series of high molecular weight poly(ethylene terephthalate-co-L-lactide) (PETL) and poly(ethylene terephthalate-co-glycolate) (PETG) copolyesters were synthesized with an excellent tensile strength greater than 50 MPa, much higher than that of most commercially available degradable polymers. The introduction of hydroxy acid endows PET with significantly improved composting and seawater degradation performance. Furtherly, the degradation rate of PETG with hydrophilic GA unit was faster than that of PETL, and the mineralization rate of PETG80 reaches 22.0%. The density of functional theory (DFT) calculation revealed that adding hydroxy acid to the PET molecular chain reduced the energy barrier of the hydrolysis reaction. The molecular polarity index (MPI) analysis furtherly confirmed that the higher affinity between the GA unit and water may be the primary reason for the faster degradation of PETG.
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页数:12
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