Abstract: The optimum conditions for preparation of walnut shell powder/polylactic acid (WSP/PLA) composites through microwave-assisted in-situ ring-opening method are studied by single factor and orthogonal test.It is indicated that the adding amount of stannous octoate catalyst has the greatest influence on the experimental results,followed by WSP content and the microwave parameters.Therefore,the optimum process conditions are as follows:the molar ratio of monomer to stannous octanoate is 2 000:1,the adding amount of WSP is 1.67%,the microwave power is 350 W and radiation lasts for 17 min.Under these conditions,the viscosity average molecular weight of the prepared composites is 74 972 and the impact strength can reach 1.27 kJ·m-2.Analysis results by polarizing microscope show that WSP/PLA composites prepared under the optimum process conditions exhibit good toughness.
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