Due to the rigid molecular chains and weak mobility of poly(lactic acid)(PLA),as well as the limited entanglement sites between the chains,PLA exhibits poor heat resistance.Therefore,in scientific research and production,it is common to induce the formation of high-melting and mutually nested transparent stereocomplex crystals(SC-PLA)to improve the heat resistance of PLA.The main preparation methods for SC-PLA are solution-based and melt-based approaches.However,SC-PLA crystals are thermodynamically metastable,making it difficult to maintain their structure during secondary processing.The processing stage involves imparting thermal history to the material,and stress-induced processing has attracted wide attention due to its simplicity,precise control over local structure,and the ability to achieve desired properties without the need for nucleating agents.Article provides an overview of the principles of forming and processing SC-PLA under shear,compression,and stretching stress fields,as well as the changes in molecular chain conformation and resulting property trends.By summarizing the factors that influence the formation ratio of SC-PLA,further explore the upper limits of its performance and expand its high-performance applications in various fields.
维普
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