Effect of β-Cyclodextrin on Foaming Quality and Mechanical Properties of Long-branched Polylactic Acid Composite
ZHANG Fei1, ZHOU Yuhui1, ZHANG Heng1, HE Li1,2, GONG Wei1,2,3
1 College of Materials and Metallurgy, Guizhou University, Guiyang 550003, China; 2 National Engineering Research Center for Compounding and Modification Polymeric Materials, Guiyang 550014, China; 3 College of Material and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China
Abstract: The effect of the dosage of ADR on the comprehensive performance of PLA was studied by using styrene-glycidyl acrylate copolymer (ADR) as chain extender, and the effect of β-cyclodextrin (BC) on the foaming quality and mechanical properties of PLA foaming composite was also discussed by gelpermeation chromatography (GPC) and differential calorimeter (DSC) and other methods. The results showed that adding 0.5% (mass fraction, the same below) of ADR making the molecular weight of the modified PLA increased from 2.2×105 g/mol to 2.61×105 g/mol, relative molecular mass distribution of the modified PLA increased to 4.23, the melt viscosity was improved obviously. When BC was added into the long branched PLA for foaming, it was found that 5% BC could obtain the ideal modified PLA composite cell structure, with the average diameter of the cell reaching 28.8 μm. When the BC content reached 3%, the bending, stretching and impact strength of the foaming long-branched PLA/BC composite increased by 9.1%, 14.3% and 52.3%, respectively, compared with the pure PLA foaming composite.
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2020, Vol. 34 
