期刊
POLYMER
卷 263, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.125527
关键词
poly(ethylene succinate); Biodegradable polyester; Crystallization property; DEG; Oxalic acid
资金
- National Natural Science Foundation of China [51703048]
- Natural Science Foundation of Hebei Province [B2020201072, B2021201056]
- Post-graduate's Innovation Fund Project of Hebei Province [CXZZBS2018001]
Poly(ethylene succinate) (PES) with high chain regularity was synthesized by adding oxalic acid in the melt poly-condensation system. The addition of oxalic acid resulted in a decrease in the molar ratios of diethylene glycol succinate (DEGS) units in the polymer chains. Oxalic acid underwent esterification and decarboxylation, producing ethylene glycol monoformate and formate end-capped PES oligomers. The formate endcapping suppressed side reactions and led to a faster transesterification rate, higher molecular weights, higher melting temperatures, increased crystallization rates, and improved mechanical properties.
Poly(ethylene succinate) (PES) with high chain regularity was synthesized by adding oxalic acid in the melt poly -condensation system. The molar ratios of diethylene glycol succinate (DEGS) units in the polymer chains were diminished from 3.8% to 0.6% when 17 mol% oxalic acid was added. Oxalic acid underwent esterification with ethylene glycol and decarboxylation, producing ethylene glycol monoformate and formate end-capped PES oligomers. The formate endcapping supressed the etherification side reactions. Ethylene glycol formate with a lower boiling point was more easily released by-production than ethylene glycol during the transesterification stage, resulting in a faster transesterification rate. Meanwhile, the molecular weights significantly increased. The high chain regularity endowed the PES with higher melting temperatures of 105 degrees C and remarkably increased crystallization rates. The mechanical properties, including tensile strength at break, were simultaneously improved for a high-molecular-weight PES sample (Mw = 100 kg/mol).
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