Favorable compatibility efficiency and thermal stability of PLA/P4HB/PGMA blends contributed by phase interface-located chain expansion reaction

IF 6.3 2区化学 Q1 POLYMER SCIENCE Polymer Degradation and Stability Pub Date : 2025-02-01 DOI:10.1016/j.polymdegradstab.2024.111159

Yitong Ding , Mingjiao Li , Wenjing Dong, Ze Kan, Zhibo Li

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Abstract

Chemically synthesized poly(4-hydroxybutyrate) (P4HB) serves as an alternative material for toughening poly(lactic acid) (PLA), but the two materials exhibit poor compatibility, and most compatibilizers fail to localize at the phase interface, resulting in inefficient toughening. In this study, a phase interface-located reactive compatibilizer, poly (glycidyl methacrylate) (PGMA), is synthesized to enhance the interfacial adhesion between PLA and P4HB, thereby improving their compatibility. The PGMA compatibilizer demonstrates a tendency to selectively disperse at the phase interface of PLA and P4HB supported by thermodynamic calculations. Compared to the PLA/P4HB blend, the PLA/P4HB/PGMA blend exhibits enhanced molecular chain entanglement and a blurrier phase interface. Consequently, the mechanical and shape memory behavior of the PLA/P4HB/PGMA blend are improved. For example, the elongation at break of the PLA/P4HB/PGMA blend increased from 20.8 % to 265.1 %, marking an increase of 12.7 times compared to the PLA/P4HB blend. Due to its small molecular weight, the

T_{o n e s e t}

(onset degradation temperature) of PGMA is only 180.3 °C. Fortunately, the

T_{o n e s e t}

of the PLA/P4HB/PGMA system exceeds 220 °C after the chain expansion reaction, indicating a significant improvement in thermal stability. Thus, the phase interface-located chain expansion reaction offers an effective approach to improving the compatibility of PLA/P4HB blends while maintaining their high thermal stability.

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化学合成的聚（4-羟基丁酸）（P4HB）可作为聚乳酸（PLA）增韧的替代材料，但这两种材料的相容性较差，而且大多数相容剂无法在相界面定位，导致增韧效率低下。本研究合成了一种位于相界面的反应性相容剂--聚（甲基丙烯酸缩水甘油酯）（PGMA），以增强聚乳酸和 P4HB 之间的界面粘附力，从而提高它们的相容性。根据热力学计算，PGMA 相容剂在聚乳酸和 P4HB 的相界面上有选择性分散的趋势。与聚乳酸/P4HB 共混物相比，聚乳酸/P4HB/PGMA 共混物表现出更强的分子链缠结和更模糊的相界面。因此，聚乳酸/P4HB/PGMA 混合物的机械和形状记忆性能得到了改善。例如，聚乳酸/P4HB/PGMA 混合物的断裂伸长率从 20.8% 提高到 265.1%，与聚乳酸/P4HB 混合物相比提高了 12.7 倍。由于分子量较小，PGMA 的起始降解温度（Toneset）仅为 180.3 °C。幸运的是，聚乳酸/P4HB/PGMA 体系在发生扩链反应后的温度起始值超过了 220 °C，这表明其热稳定性有了显著提高。因此，相界面定位链膨胀反应为提高聚乳酸/P4HB 混合物的相容性并保持其较高的热稳定性提供了一种有效的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.