High melt viscosity, low yellowing, strengthened and toughened biodegradable polyglycolic acid via chain extension of aliphatic diisocyanate and epoxy oligomer

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-05-01 DOI:10.1016/j.reactfunctpolym.2024.105926

Qimeng Xie , Ziwei Liu , Ju Chen , Bo Jing , Xiaoxuan Zou

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Abstract

Poly(glycolic acid) (PGA) is a biodegradable plastic with excellent degradation rate, barrier properties, and heat resistance. However, its low melt viscosity and narrow processing temperature severely limit its application. To overcome these drawbacks, the aromatic diisocyanates TDI and MDI, aliphatic diisocyanate HDI, and multifunctional epoxy oligomer ADR were used as the chain extender to modify PGA. The PGA/HDI shows a faster chain extension reaction rate and significantly less yellowing than PGA/TDI or PGA/MDI. The combined use of HDI and ADR to modify PGA can produce long chain branched/crosslinked structures, resulting in a significant increase in melt viscosity, with complex viscosity two orders of magnitude higher than that of pure PGA and minimal yellowing. The T_-5% of PGA/HDI/ADR is 45 °C higher than that of pure PGA, and its crystallization temperature, crystallization rate and melting temperature are significantly decreased, suggesting that it has a wider processing temperature window. Moreover, the tensile and flexural strength of PGA/HDI/ADR are 113.8 MPa and 216.8 MPa, respectively, an increase of 25% and 26% over pure PGA, while the elongation at break and impact strength increase to 9.5% and 11.6 KJ/m², respectively, 42% and 176% higher than pure PGA.

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通过脂肪族二异氰酸酯和环氧低聚物的链延伸实现高熔体粘度、低黄变、增强和增韧的可生物降解聚乙醇酸

聚羟基乙酸（PGA）是一种生物可降解塑料，具有出色的降解率、阻隔性和耐热性。然而，其较低的熔体粘度和较窄的加工温度严重限制了它的应用。为了克服这些缺点，我们使用芳香族二异氰酸酯 TDI 和 MDI、脂肪族二异氰酸酯 HDI 以及多功能环氧低聚物 ADR 作为扩链剂来改性 PGA。与 PGA/TDI 或 PGA/MDI 相比，PGA/HDI 的扩链反应速度更快，黄化程度明显降低。联合使用 HDI 和 ADR 对 PGA 进行改性可产生长链支化/交联结构，从而显著提高熔体粘度，其复合粘度比纯 PGA 高两个数量级，且黄变极少。PGA/HDI/ADR 的 T-5% 比纯 PGA 高 45 °C，其结晶温度、结晶速率和熔融温度都显著降低，这表明它具有更宽的加工温度窗口。此外，PGA/HDI/ADR 的拉伸强度和弯曲强度分别为 113.8 兆帕和 216.8 兆帕，比纯 PGA 分别提高了 25% 和 26%，断裂伸长率和冲击强度分别提高到 9.5% 和 11.6 KJ/m2，比纯 PGA 分别提高了 42% 和 176%。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.