聚乳酸/聚乙烯醇复合膜的韧性及其阻隔性能OA

Polylactic acid(PLA)is a high-modulus,high-strength biodegradable material widely used in packaging materials,biomedicine,and other fields.To address its drawbacks of poor toughness and mediocre barrier properties,a PLA/polyvinyl alcohol(PVA)composite material was prepared using a flexible and controllable solution method,employing PVA as a toughening agent and citrate ester(TEC)as a crosslinking agent.By adjusting the mass ratio of PLA/PVA and the mass fraction of TEC in the composite system,the mechanical properties and barrier performance of the composite materials were analyzed.Experimental data indicate that at the optimal ratio of 70:30(PLA/PVA)and 4％TEC by mass,compared to pure PLA,the fracture elongation of the composite material increased by 418.32％,a 51.86％reduction in oxygen transmission rate,and an 82.21％decrease in water vapor transmission rate.Microscopic observations of the composite structure revealed that TEC addition effectively improved the interfacial compatibility between PLA and PVA,resulting in a more uniform phase structure.This innovative approach of synergistically modifying PLA through crosslinking with PVA and TEC demonstrated its effectiveness in significantly enhancing PLA toughness while improving barrier properties,offering a new pathway for developing high-performance biodegradable materials.