Influences of poly(lactic acid)-grafted carbon nanotube on thermal, mechanical, and electrical properties of poly(lactic acid)
- Authors
- Yoon, Jin Tae; Jeong, Young Gyu; Lee, Sang Cheol; Min, Byung Gil
- Issue Date
- Jul-2009
- Publisher
- WILEY-BLACKWELL
- Keywords
- poly(lactic acid); carbon nanotube; nanocomposites; thermo-mechanical property; electrical property
- Citation
- POLYMERS FOR ADVANCED TECHNOLOGIES, v.20, no.7, pp.631 - 638
- Journal Title
- POLYMERS FOR ADVANCED TECHNOLOGIES
- Volume
- 20
- Number
- 7
- Start Page
- 631
- End Page
- 638
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/19236
- DOI
- 10.1002/pat.1312
- ISSN
- 1042-7147
- Abstract
- Poly(lactic acid)-grafted multiwalled carbon nanotubes (MWNT-g-PLA) were prepared by the direct melt-polycondensation of L-lactic acid with carboxylic acid-functionalized MWNT (MWNT-COOH) and then mixed with a commercially available neat PLA to prepare PLA/MWNT-g-PLA nanocomposites. Morphological, thermal, mechanical, and electrical characteristics of PLA/MWNT-g-PLA nanocomposites were investigated as a function of the MWNT content and compared with those of the neat PLA, PLA/MWNT, and PLA/MWNT-COOH nanocomposites. It was identified from FE-SEM images that PLA/MWNT-g-PLA nanocomposites exhibit good dispersion of MWNT-g-PLA in the PLA matrix, while PLA/MWNT and PLA/MWNT-COOH nanocomposites display MWNT aggregates. As a result, initial moduli and tensile strengths of PLA/MWNT-g-PLA composites are much higher than those of neat PLA, PLA/MWNT, and PLA/MWNT-COOH, which stems from the efficient reinforcing effect of MWNT-g-PLA in the PLA matrix. In addition, the crystallization rate of PLA/MWNT-g-PLA nanocomposites is faster than those of neat PLA, PLA/MWNT, and PLA/MWNT-COOH, since MWNT-g-PLA dispersed in the PLA matrix serves efficiently as a nucleating agent. It is interesting that, unlike PLA/MWNT nanocomposites, surface resistivities of PLA/MWNT-g-PLA nanocomposites did not change noticeably depending on the MWNT content, demonstrating that MWNTs in PLA/MWNT-g-PLA are wrapped with the PLA chains of MWNT-g-PLA. Copyright (C) 2008 John Wiley & Sons, Ltd.
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