Fully biobased poly(butylene 2,5-furandicarboxylate)-co-poly(lactic acid)s (PBFLAs) of lactic acid composition from 10% to 40% are synthesized. They are subjected to molecular, thermal, diffractometric, degradable and mechanical characterizations. Thermogravimetric analysis shows that PBFLA are thermally stable at least 350 °C, much higher than PLA. After the incorporation of lactic acid units, both T_m and crystallization rate decrease with respect to homopolymers. X-ray diffraction measurements indicate that no PLA crystal is present during crystallization. All samples perform better barrier properties with respect to PLA, implying potential application in packaging. These samples behave like semicrystalline plastic in the tensile tests. PBFLA copolyesters show Young’s modulus, maximum tensile strength and breakage elongation higher than 1000 MPa, 38 MPa, and 230%, respectively. Such comprehensive mechanical behaviors exceed most biodegradable materials. Lastly, biodegradability could be significantly improved when more than 20% of lactic acid units are introduced into homopolymers.

中文翻译：

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乳酸对聚（2,5-呋喃二甲酸丁二酯）的改性，以制备具有良好机械和阻隔性能的可生物降解共聚酯

合成了10％至40％的乳酸组合物的完全生物基的聚（2，5-呋喃二甲酸丁二酯）-共聚（乳酸）（PBFLA）。它们经过分子，热，衍射，可降解和机械表征。热重分析表明，PBBFA在至少350°C的温度下具有热稳定性，远高于PLA。掺入乳酸单元后，两者的T _m相对于均聚物，结晶速率降低。X射线衍射测量表明在结晶过程中不存在PLA晶体。所有样品均具有相对于PLA更好的阻隔性能，这意味着其在包装中的潜在应用。这些样品在拉伸试验中表现得像半结晶塑料。PBFLA共聚酯的杨氏模量，最大抗张强度和断裂伸长率分别高于1000 MPa，38 MPa和230％。这种全面的机械性能超过了大多数可生物降解的材料。最后，当将超过20％的乳酸单元引入均聚物中时，可生物降解性将得到显着改善。