Next-Generation High-Performance Biobased Naphthalate-Modified PET for Sustainable Food Packaging Applications
Next-Generation High-Performance Biobased Naphthalate-Modified PET for Sustainable Food Packaging Applications
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DOI：
10.1021/acs.macromol.2c00777
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发表时间：
2022-08
期刊：
影响因子：
5.5
通讯作者：
Ting-Han Lee;Hengzhou Liu;Michael J. Forrester;Liyang Shen;Tung-ping Wang;Huangchao Yu;Jianqi He;Wenzheng Li;G. Kraus;Eric W. Cochran
中科院分区：
文献类型：
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作者：
Ting-Han Lee;Hengzhou Liu;Michael J. Forrester;Liyang Shen;Tung-ping Wang;Huangchao Yu;Jianqi He;Wenzheng Li;G. Kraus;Eric W. Cochran
我们报道了一系列新型聚对苯二甲酸乙酯（PET）共聚物，通过加入生物优势的二甲基2,7-萘二羧酸酯（2,7- n）作为共聚单体，其性能得到了改善。PET是最常用的工程热塑性塑料之一，在食品包装工业中无处不在。然而，它的应用受到较差的热（低tg）和氧阻隔性能的限制。以乙二醇（EG）、对苯二甲酸（TPA）和2,7-n为原料，采用标准的两步熔融缩聚反应合成了一系列聚对苯二甲酸乙酯-stat-2,7-萘二酸酯共聚物。2,7- n显著改善了材料的热性能、机械性能和阻隔性能。随着2,7- n含量的增加，共聚物的玻璃化转变温度（Tg> 75.4℃）和热稳定性（Td,5%> 405.1℃）单调增加，超过PET （Tg= 69.7℃，Td,5%= 401.4℃）。此外，通过2,7- n加载可以调节材料的力学性能和结晶行为。经组分优化后的共聚物的断裂伸长率和抗拉强度分别提高了70%和200%。此外，含20% 2,7- n的共聚物的氧透性值降至= 0.0073 barer，比PET提高了30%。这些结果表明，由生物基化学品提供的新型替代模式可以转化为包装材料的性能优势。最后，构建了作为共聚单体的生物优势化学物质与产品性能之间的基本结构-性能关系，作为未来增值可再生聚合物的指导。
We report a series of novel poly(ethylene terephthalate) (PET) copolymers with improved properties through the incorporation of bioadvantaged dimethyl 2,7-naphthalenedicarboxylate (2,7-N) as a comonomer. PET is among the most commonly used engineering thermoplastics, ubiquitous in the food packaging industry. However, its application is limited by poor thermal (lowTg) and oxygen barrier performance. A series of poly(ethylene terephthalate-stat-2,7-naphthalate) copolymers were synthesized from ethylene glycol (EG), terephthalic acid (TPA), and 2,7-N via a standard two-step melt polycondensation reaction. The 2,7-N significantly improved the thermal, mechanical, and barrier properties. The glass transition temperature (Tg> 75.4 °C) and thermal stability (Td,5%> 405.1 °C) of the copolymers increase monotonically with 2,7-N content, exceeding those of PET (Tg= 69.7 °C,Td,5%= 401.4 °C). Moreover, the mechanical properties and the crystallization behaviors are tunable through the 2,7-N loading. Composition-optimized copolymers showed an increase of 70% and 200% in elongation at break and tensile strength, respectively. In addition, the oxygen permeability value of the copolymers containing 20% 2,7-N loading fell to= 0.0073 barrer, a 30% improvement over that of PET. These results illustrate that the novel substitution patterns offered by biobased chemicals can translate to performance advantages in packaging materials. Finally, the fundamental structure–property relationships connecting the bioadvantaged chemicals as the comonomers to the product performance were constructed as a guide for value-added renewable polymers in the future.