The synergetic effect of phenylphosphonic acid zinc and microfibrillated cellulose on the injection molding cycle time of PLA composites |
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Authors: | Email author" target="_blank">Lisman?SuryanegaraEmail author Hiroaki?Okumura Antonio?Norio?Nakagaito Hiroyuki?Yano |
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Institution: | (1) Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji Kyoto, 611-0011, Japan;(2) Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori 680-8552, Japan |
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Abstract: | This study evaluates the effects of nucleants phenylphosphonic acid zinc (PPA-Zn) and talc, mold temperature, and microfibrillated
cellulose (MFC) reinforcement in the acceleration of injection molding cycle of polylactic acid (PLA). PLA was dissolved in
an organic solvent, mixed with nucleant and MFC, and dried compounds were injection molded into molds at temperatures ranging
from 40 °C to 95 °C and holding times from 10 s to 120 s. Our results showed that PPA-Zn is more effective nucleating agent
compared to talc. The addition of 1 wt% PPA-Zn and the mold temperature of 95 °C exhibited the fastest crystallization rates
for the molded PLA, however, at this temperature the parts could not be quickly ejected without distortion. Addition of 10 wt%
MFC increased the stiffness of PLA at high temperatures and allowed ejection of parts without distortion at a holding time
of just 10 s. At this holding time, the crystallinity of the PLA composite was 15.3% but the storage modulus above T
g
was superior to that of fully crystallized neat PLA due to MFC reinforcement, retaining the shape of the molded part during
demolding. The mechanical properties of the composite at room temperature were also higher than those of fully crystallized
neat PLA. |
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Keywords: | |
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