Synthesis and degradability of copolyesters of 2, 5-furandicarboxylic acid, lactic acid, and ethylene glycol

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• 作者：Hongli Wu ; Binbin Wen ; Hua Zhou ; Jiadong Zhou ; Zuolong Yu ; Liyan Cui ; Ting Huang ; Fei Cao ; ^{csaofeiw@njtech.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：2 ; 5-Furandicarboxylic acid ; Lactic acid ; Copolyester ; Degradation
• 刊名：Polymer Degradation and Stability
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：121
• 期：Complete
• 页码：100-104
• 全文大小：905 K

文摘

Polyethylene 2, 5-furandicarboxylate-lactic acid copolyesters (PEFL) were synthesized from bis (hydroxyethyl)-2, 5-furandicarboxylate and oligomer of class="smallcaps">l-lactic acid, through two-stage condensation. The polyesters were characterized using FTIR, ¹H NMR, GPC, and WXRD. The weight-average molecular weight (M_w) of the polyesters ranged from 68240 to 130433. The glass transition temperature (T_g) of the copolyesters increased gradually with increasing content of 2, 5-furandicarboxylate. In phosphate buffer solution (PBS, pH = 7.4) and in soil, the degradability of the polyesters was evaluated for 55 d. More weight loss was obtained with a higher ratio of lactate polymers in soil than those with a lower ratio in PBS. After 55 d, the weight loss of PEFL20/80 reached 65% and 24% in soil and PBS, respectively. However, the mole fraction of lactyl and furanic units that was calculated by ¹H NMR data did not change. Comparing the scanning electron microscopy images, we found many micro-cracks on the copolyester surfaces. Meanwhile, M_w and T_g also decreased prominently during degradation.