Effect of Coupling Agent on 3D Printing Performance of PLA/PBAT/Poplar Powder Composites

doi:10.19491/j.issn.1001-9278.2020.11.012

Abstract

Abstract:

PLA/PBAT/poplar powder （WF） composites were prepared by melt blending using poly（lactic acid）（PLA） and poly（butylene adipate-co-terephthalate）（PBAT） as matrices and WF as a filler. The standard test specimens were then prepared by a fused?deposition?modeling （FDM） technology. The effect of silane coupling agent （KH550） on the morphology， and rheological and mechanical properties of the composites was investigated with scanning electron microscopy observation， Fourier?transform infrared spectroscopy， rotational rheometer and mechanical test machine. The results indicated that the composites achieve an increase in tensile strength by 136 % at the coupling agent content of 3 wt%. The silane coupling agent could be covalently coupled with PLA and PBAT to form a grafted copolymer， and therefore the compatibility between two phases was improved. Meanwhile， the polycondensation reaction between the silane coupling agent and the hydroxyl group on the surface of WF could also effectively improve its compatibility with the PLA/PBAT matrix. As a result， the mechanical properties of the composites were greatly improved. The viscosity of the composites decreased with an increase of coupling agent content. When the content is 3 %， the wire achieved the optimum comprehensive printing performance at the coupling agent content of 3 wt%， resulting in an optimum quality for the printed products.

Key words: poly（lactic acid）, poly（butylene adipate-co-terephthalate）, silane coupling agent, graft copolymer, fused deposition modeling

CLC Number:

TQ321

LUO Tongtong, SUN Ling. Effect of Coupling Agent on 3D Printing Performance of PLA/PBAT/Poplar Powder Composites[J]. China Plastics, 2020, 34(11): 66-72.

Figures/Tables 9

Fig.1. Brittle fractured micro?sections of PLA/PBAT blends modified with different content of coupling agent

Fig.2. SEM of a rapid prototyped sample of PLA/PBAT/WF composite

Fig.3. FTIR spectra of PLA/PBAT and PLA/PBAT/WF composites modified by coupling agents

Fig.4. Mechanical properties of PLA and PBAT/WF composite prints modified by K and W groups with different content of coupling agent

样品编号	拉伸强度/MPa	拉伸模量/MPa	断裂伸长率/%
K₀	15.25	213.62	0.16
K₁	17.31	238.11	0.42
K₂	18.91	245.33	0.61
K₃	19.15	253.12	0.69
W₀	14.81	211.37	0.14
W₁	24.56	263.16	0.73
W₂	36.14	352.21	1.16
W₃	28.56	303.03	1.03

Tab. 1. Mechanical properties of PLA/PBAT/WF composites

Fig.5. Viscosity and shear stress of PLA/PBAT/WF composites modified with different coupling agents as a function of shear rate

填充率/%

层厚/mm

打印速度/

mm·s^-1

喷嘴

温度/℃

热床

温度/℃

100

0.2

190

Tab.2. Fused deposition molding printing parameters

Fig.6. FDM model of solid square box

Fig.7. Optical micrograph of FDM part surface

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