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To achieve these objectives, research efforts are focused on the discovery of promising alternatives to conventional compatibilizers. Recently, ionic liquids (ILs) have emerged as innovative compatibilizing agents due to their infinite possible combinations. Here, biopolymer blends based on poly(butylene\u2010adipate\u2010co\u2010terephthalate)\/poly(lactic acid) (PBAT\/PLA) blends were processed by melt extrusion process using glycine betaine\u2010based ILs as more environmentally friendly interfacial agents. In fact, only 1\u2009wt% of ILs was incorporated into PBAT\/PLA blends, leading to a co\u2010continuous morphology characterized by the formation of PLA fibrils with various thicknesses and lengths, having a significant influence on the rheological, mechanical, water, and gas barrier properties. Then, we have demonstrated that the use of these ILs induced good mechanical performance (Young's modulus ~540\u2009MPa, % strain: 270%\u2013400%), combined with a reduction of almost 10 times in water vapor permeability (WVP). In addition, for a better understanding, the prediction of the permeability to gas of the formulations was performed by using the Nielsen model and compared to the experimental values (40%\u201375%), highlighting a good correlation between both methods.<\/jats:p>","DOI":"10.1002\/cplu.70238","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T21:44:18Z","timestamp":1789595058000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Influence of Glycine Betaine Based\u2010Ionic Liquids on Rheological, Mechanical and Barrier Properties of Poly(butylene\u2010adipate\u2010co\u2010terephthalate)\/Poly(lactic acid) (PBAT\/PLA) Blends"],"prefix":"10.1002","volume":"91","author":[{"given":"Houss\u00e9m","family":"Chabane","sequence":"first","affiliation":[{"name":"Laboratoire de Chimie Macromol\u00e9culaire Ecole Militaire Polytechnique  Bordj El\u2010Bahri Algiers 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