A series of polylactic acid (PLA)/polyethylene glycol (PEG) blends was prepared by melt blending using PEG as a plasticizer to address the disadvantages of PLA brittleness. PEG can weaken the intermolecular chain interactions of PLA and improve its processing properties. PLA-grafted maleic anhydride (GPLA) was reactively blended with PLA/PEG to obtain a high tenacity PLA/PEG/GPLA blend. GPLA was prepared by melt grafting using diisopropyl peroxide as the initiator and maleic anhydride as the graft. The effects of different PEG molecular weights (1000-10 000 g mol) on the properties of PLA/PEG/GPLA blends were investigated. GPLA reacted with PEG1000 ( = 1000 g mol) to form short PLA branched chains and reacted with PEG10000 ( = 10 000 g mol) to form a small number of PLA branched chains, which was unconducive to increasing the intermolecular chain entanglement. The branched PLA formed by the reaction between PEG6000 ( = 6000 g mol) and GPLA had a remarkable effect on increasing intermolecular chain entanglement. The complex viscosity, modulus, and melt strength values of PLA/PEG6000/GPLA blends were relatively large. The elongation at break of the blends reached 526.9%, and the tensile strength was 30.91 MPa. It provides an effective way to prepare PLA materials with excellent comprehensive properties.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9632605 | PMC |
| http://dx.doi.org/10.1039/d2ra03513h | DOI Listing |
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