Abstract
In this study, antistatic biodegradable polylactic acid (PLA)/multi-walled carbon nanotube (PLA/MWCNT) composites were prepared by the melt-blending of MWCNT with PLA. The conductive, mechanical, thermal properties and microstructure of the PLA/MWCNT composites were investigated. Results revealed that with the loading of 1.0 to 1.5 wt% of MWCNT, the tensile strength, elongation at break, and crystallinity of the composites slightly increase, followed by a downward trend with the further increase in the loading amount of MWCNT. With the increase in the MWCNT loading amount to 3.0%, the volume resistivity and surface resistivity of the composites were reduced by nine orders of magnitude. According to the internal microstructure of PLA/MWCNT, by the loading of 1.5 wt% of MWCNT, the MWCNT formed a conductive network in the composite matrix, reaching the percolation threshold. The new composties can be applicated in medical protective clothing for protecting the electronic instrument.
Highlights
Polylactic acid (PLA) is a renewable polyester that can replace typical non-degradable plastics,[1] which has been approved by the US Food and Drug Administration (FDA) for applications in clinical medicine and has been widely used.[2,3,4]
According to the National Standard GB/T1040-92 plastic tensile performance test, the tensile strength σ and elongation at break ε of the PLA/multi-walled carbon nanotube (MWCNT) composites were measured at room temperature byusing WDW-1 microcomputer controlled electronic universal testing machine
MWCNT and PLA were melt-blended according to the ratio of the added MWCNT, which was 0.0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%, and 3.0 wt%, of the total mass of the composite, respectively
Summary
Polylactic acid (PLA) is a renewable polyester that can replace typical non-degradable plastics,[1] which has been approved by the US Food and Drug Administration (FDA) for applications in clinical medicine and has been widely used.[2,3,4] PLA exhibits several advantages including good biocompatibility as well as excellent mechanical strength and barrier property. According to the National Standard GB/T1040-92 plastic tensile performance test, the tensile strength σ and elongation at break ε of the PLA/MWCNT composites were measured at room temperature byusing WDW-1 microcomputer controlled electronic universal testing machine.
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