Study on Compatibilizing Modification of PLA/PPC Blends with Long-Chain Hyperbranched Polymer

doi:10.19491/j.issn.1001-9278.2019.02.001

Abstract

Abstract: A grafting modification was performed for the hyperbranched polyester synthesized by a “one-step” method to obtain a sort of hyperbranched polymer with a large number of long-chain stearic acid at the end (LCHBP), and the chemical structure of LCHBP was characterized by Fourier-transform infrared spectroscopy, nuclear magnetic spectroscopy and hydroxyl value titration. The polylactic acid (PLA)/polypropylene carbonate (PPC) blends were modified with LCHBP through melt blending, and then their thermal performance, mechanical properties and morphologies of fracture surface were investigated by using differential scanning calorimeter, electronic universal testing machine and scanning electron microscope. The results indicated that the ΔTg of PLA/PPC/LCHBP blends decreased significantly with the addition of LCHBP, indicating an improvement in compatibility of PLA and PPC. Compared to PLA/PPC binary blends, the PLA/PPC/LCHBP ternary blends showed a remarkable increase in elongation at break and impact strength, whereas their tensile strength remained unchanged. The tensile strength of ternary blends increased by 61 % and their elongation at break increased by 367 % with the addition of 2.0 wt% LCHBP.

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