Yitong Ding , Mingjiao Li , Wenjing Dong, Ze Kan, Zhibo Li
{"title":"Favorable compatibility efficiency and thermal stability of PLA/P4HB/PGMA blends contributed by phase interface-located chain expansion reaction","authors":"Yitong Ding , Mingjiao Li , Wenjing Dong, Ze Kan, Zhibo Li","doi":"10.1016/j.polymdegradstab.2024.111159","DOIUrl":null,"url":null,"abstract":"<div><div>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 <span><math><msub><mi>T</mi><mrow><mi>o</mi><mi>n</mi><mi>e</mi><mi>s</mi><mi>e</mi><mi>t</mi></mrow></msub></math></span> (onset degradation temperature) of PGMA is only 180.3 °C. Fortunately, the <span><math><msub><mi>T</mi><mrow><mi>o</mi><mi>n</mi><mi>e</mi><mi>s</mi><mi>e</mi><mi>t</mi></mrow></msub></math></span> 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.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"232 ","pages":"Article 111159"},"PeriodicalIF":6.3000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Degradation and Stability","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141391024005020","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
Favorable compatibility efficiency and thermal stability of PLA/P4HB/PGMA blends contributed by phase interface-located chain expansion reaction
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 (onset degradation temperature) of PGMA is only 180.3 °C. Fortunately, the 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.
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.
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