Influences of poly(lactic acid)‐grafted carbon nanotube on thermal, mechanical, and electrical properties of poly(lactic acid) | Zendy

Yoon Jin Tae | Zendy; Jeong Young Gyu | Zendy; Lee Sang Cheol | Zendy; Min Byung Gil | Zendy

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Influences of poly(lactic acid)‐grafted carbon nanotube on thermal, mechanical, and electrical properties of poly(lactic acid)

Author(s) -

Yoon Jin Tae,

Jeong Young Gyu,

Lee Sang Cheol,

Min Byung Gil

Publication year - 2009

Publication title -

polymers for advanced technologies

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.61

H-Index - 90

eISSN - 1099-1581

pISSN - 1042-7147

DOI - 10.1002/pat.1312

Subject(s) - materials science , nanocomposite , lactic acid , carbon nanotube , ultimate tensile strength , polylactic acid , crystallization , lactide , thermal stability , condensation polymer , composite material , chemical engineering , polymer , copolymer , genetics , bacteria , engineering , biology

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 © 2008 John Wiley & Sons, Ltd.

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