Abstract Enhanced durability of bio-based polylactic acid (PLA) is one of the prerequisites to be a considered as alternative to petroleum-based polymers in long time application. The effect of bis(2,6-diisopropylphenyl)carbodiimide (BDICDI) additive in various concentration on the extent of hydrolytic stabilization and subsequent degradation kinetics of PLA was studied in the process of abiotic hydrolysis and microbial decomposition under composting conditions. The study showed that BDICDI acts as an efficient stabilizer suppressing the hydrolytic scission of ester bonds of PLA in both degradation processes tested, especially at concentrations above 1.5% w/w. Within the stabilization period which strongly depends on concentrations of BDICDI, suppression of hydrolytic degradation also triggered preservation of thermal and mechanical properties. After the period of stabilization as the dose of stabilizer is depleted, probably via reaction with water molecules and carboxylic groups, the material was hydrolyzed at a comparable or even slightly higher rate than pure PLA. By applying the appropriate amount of BDICDI, the approximate duration of stabilization could be set to suit the desired requirements of the final product.

中文翻译：

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控制PLA水解稳定性和生物降解性的碳二亚胺添加剂

摘要 生物基聚乳酸（PLA）的耐久性增强是长期应用中被认为可替代石油基聚合物的先决条件之一。研究了在堆肥条件下的非生物水解和微生物分解过程中，不同浓度的双（2,6-二异丙基苯基）碳二亚胺（BDICDI）添加剂对PLA水解稳定程度和随后降解动力学的影响。研究表明，BDICDI 可作为一种有效的稳定剂，在所测试的两种降解过程中抑制 PLA 酯键的水解断裂，尤其是在浓度高于 1.5% w/w 时。在强烈依赖于 BDICDI 浓度的稳定期内，水解降解的抑制也触发了热和机械性能的保存。在稳定剂剂量耗尽的稳定期后，可能通过与水分子和羧基反应，材料以与纯 PLA 相当或什至略高的速率水解。通过应用适量的 BDICDI，可以设置大致的稳定持续时间以满足最终产品的所需要求。