近年来,立构聚乳酸(ScPLA)的引入被证实是调控聚乙交酯(PGA)降解速度的一种有效方式。然而,ScPLA的引入对于PGA热降解行为的影响规律尚不清晰。为此,通过热重分析探究了PGA/ScPLA复合纤维的热降解行为,并采用Kissinger法和Flynn-Wall-Ozawa法计算其热解活化能(Ea)。结果表明:Ea随ScPLA比例增加呈现先升高后降低的非单调变化。结合聚集态结构分析,揭示了分子链缠结、甲基位阻效应、结晶度变化及相界面数量对复合纤维热稳定性的影响机制,为实现复合纤维的性能调控提供了重要理论依据。
In recent years,the introduction of stereopolylactic acid (ScPLA) has been confirmed as an effective method for regulating the degradation rate of polyglycolic acid (PGA).However,the influence of ScPLA on the thermal degradation behavior of PGA is still unclear.Therefore,this study investigated the thermal degradation behavior of PGA/ScPLA composite fibers through thermogravimetric analysis and calculated their thermal decomposition activation energy (Ea) using the Kissinger method and the Flynn-Wall-Ozawa method.It was found that Ea exhibited a non-monotonic change,first increasing and then decreasing with the increase of ScPLA content.By combining aggregate state structure analysis,the impact mechanisms of molecular chain entanglement,methyl steric hindrance,crystallinity changes,and the number of phase interfaces on the thermal stability of the composite fibers were revealed,providing an important theoretical basis for the performance control of composite fibers.
[1] Chen S,Zhang C,Zhang X.Autodegradable polymers:complete degradation without any trigger,tunable performance,and biomedical applications[J].Journal of the American Chemical Society,2024,146(50):34852-34860.
[2] Cakmak O K.Biodegradable polymers-a review on properties,processing,and degradation mechanism[J].Circular Economy and Sustainability,2024,4(1):339-362.
[3] Dintcheva N T.Overview of polymers and biopolymers degradation and stabilization towards sustainability and materials circularity[J].Polymer,2024,306:127136.
[4] Benatti Ana Carolina B,Pattaro Ana Flávia,Rodrigues Ana Amélia,et al.Chapter 4-bioreabsorbable polymers for tissue engineering:PLA,PGA,and their copolymers[J].Materials for Biomedical Engineering,2019:83-116.
[5] Chen S,Zhang X,He M,et al.Degradation of PGA,prepared by reactive extrusion polymerization,in water,humid,and dry air,and in a vacuum[J].Journal of Materials Research,2020,35(14):1846-1856.
[6] Ma C,Zhu M,Gong M,et al.Strong,tough and aqua-degradable poly(glycolic acid)/poly (butyleneadipate-co-terephthalate) composites achieved by interfacial regulation[J].Journal of Materials Research and Technology,2025,35:995-1007.
[7] 王兴国,吕明福,黄逸伦,等.聚乙醇酸高温降解性能研究及其调控方法[J].中国塑料,2024,38(8):13-19.
[8] Cui H,Zhang Z,Huang Q.Enhancing degradation resistance of polyglycolic acid through stereocomplex polylactic acid integration:a novel ‘stereo-lock’ approach[J].Polymer,2025,321:128088.
[9] 朱聪.茶籽壳与固体有机废弃物共热解协同效应及产物分析[D].赣州:江西理工大学,2024.
[10] 吕闪闪.聚乳酸基复合材料降解行为及机制的研究[D].哈尔滨:东北林业大学,2019.
[11] Alhulaybi Z,Dubdub I,Alyaari M,et al.Pyrolysis kinetic study of polylactic acid[J].Polymers,2023,15(1):12.
[12] 杨婷婷.生物基聚酰胺56的结构,性能及阻燃改性研究[D].上海:东华大学,2022.
[13] Zhu J,Cui H,Shi X,et al.Preparation of stereocomplex polylactic acid fiber and evolution of crystal structures[J].Materials Letters,2023,349:134744.
基金资助
北京林业大学2025年大型仪器创新基金项目(BFU-DXYQCX-2025-3);“科创甬江2035”关键技术突破计划项目(2024Z105)
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