Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing

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

doi:10.1007/s10118-022-2665-9

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Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing

RESEARCH ARTICLE | Updated：2022-03-23

- Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing
- Chinese Journal of Polymer Science Vol. 40, Issue 3, Pages: 299-309(2022)
- Affiliations：
  
  a.Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao 266042, China
  b.Shaanxi University of Science and Technology, Xi’an 710021, China
- Author bio：
  
  zjm@qust.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2665-9
  CLC：
- Received：05 October 2021，
  
  Revised：2021-10-31，
  
  Accepted：10 November 2021，
  
  Online First：11 January 2022，
  
  Published：01 March 2022
- Accepted：
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Wu, X.; Liu, Y. X.; Wu, H. P.; Wu, H.; Wang, H. J.; Duan, Y. X.; Zhang, J. M. Cellulose nanocrystals-mediated phase morphology of PLLA/TPU blends for 3D printing. Chinese J. Polym. Sci. 2022, 40, 299–309

Xiao Wu, Yun-Xiao Liu, Hai-Peng Wu, et al. Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing[J]. Chinese Journal of Polymer Science, 2022, 40(3): 299-309.
Wu, X.; Liu, Y. X.; Wu, H. P.; Wu, H.; Wang, H. J.; Duan, Y. X.; Zhang, J. M. Cellulose nanocrystals-mediated phase morphology of PLLA/TPU blends for 3D printing. Chinese J. Polym. Sci. 2022, 40, 299–309 DOI： 10.1007/s10118-022-2665-9.

Xiao Wu, Yun-Xiao Liu, Hai-Peng Wu, et al. Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing[J]. Chinese Journal of Polymer Science, 2022, 40(3): 299-309. DOI： 10.1007/s10118-022-2665-9.

摘要

Abstract

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.

关键词

Keywords

references

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