Polymerized rosin(PR)was used as compatibilizer,and poly(lactic acid)/poly(butylene terephthalate-butylene terephthalate)(PLA/PBAT)blend fibers with different PLA/PBAT ratios were prepared by melt blending method.The physical and chemical properties of the blends and fibers were evaluated by tensile test,microstructural observation,thermal analyses,and rheological test.Introduction of PR leads to a decrease in the glass transition and melting temperature of PBAT and PLA,promoting the homogeneous dispersion of PBAT phase.In the PR-contained mixture with PLA and PBAT,PR particles with smaller particle sizes were obtained,the heterogeneous nucleation effect of PBAT are enhanced,and the crystallization temperature of PLA increases.With a PR mass fraction of 30％,the diameter of microfiber is reduced to less than 2 pm.With the increase of PBAT content,both the elongation at break is increased by up to nearly 600％,and the breaking strength of the blend fibers is also increased by about 200％.
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