Incorporation of nanoparticles into polymer blend to obtain finely dispersed morphology has been considered as an effective strategy to prepare nanocomposites.Owing to the renewable and degradable characters,cellulose nanocrystals (CNCs) have been proposed to tailor the phase morphology of poly(L-lactic acid) (PLLA) blend for producing high-performance fused deposition modeling (FDM) consumables.However,the main challenge associated with the ternary systems is the dispersion of the highly hydrophilic CNCs in non-polar PLLA blend by industrial melt blending without involving solution.Herein,with poly(vinyl acetate) (PVAc) modified CNCs powder (a mixture of PVAc grafted from CNCs and PVAc homopolymer latex),the selective dispersion of CNCs in PLLA has been achieved by simple melt processing of PLLA/TPU (polyether polyurethane)/CNCs blend.This results in the ultra-fine TPU droplets at nanoscale in PLLA and improves the melt processibility of composites in FDM due to the decreased viscosity ratio of the dispersed/matrix and the enhanced melt elasticity of PLLA.Combined with the intensive shear and continuous stretch effect during FDM,aligned TPU nanofibers (TNFs) were in situ formed along the elongational flow direction during deposition,which in turn contributed to the improvement of PLLA/TPU/CNCs with 5 wt％ filler loading in tensile ductility by 418％,inter-layer adhesion strength and notched impact toughness by 261％ and 210％,respectively,as well as achieved good dimensional accuracy and very fine surface quality.

Xiao Wu;Yun-Xiao Liu;Hai-Peng Wu;Hao Wu;Hai-Jun Wang;Yong-Xin Duan;Jian-Ming Zhang

Key Laboratory of Rubber-Plastics,Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics,Qingdao University of Science & Technology,Qingdao 266042,China;Shaanxi University of Science and Technology,Xi'an 710021,China

高分子科学（英文版）

[1]Xiao Wu;Yun-Xiao Liu;Hai-Peng Wu;Hao Wu;Hai-Jun Wang;Yong-Xin Duan;Jian-Ming Zhang-.Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing)[J].高分子科学（英文版）,2022(03):299-309

consumables,TNFs,elongational

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