A study of the surface morphology of poly(p-phenylene terephthalamide) chars using scanning probe microscopy

Alberto Castro-Muñiz, Juan Ignacio Paredes, Amelia Martínez-Alonso, Juan M.D. Tascón

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    The objective of this work was to investigate the changes in surface morphology associated with thermal degradation of poly(p-phenylene terephthalamide) (PPTA) into chars. To this end, PPTA samples decomposed at several temperatures up to 800 °C were studied on a local scale using atomic force microscopy (AFM) and scanning tunnelling microscopy (STM). Domains with a diameter of 40-50 nm started appearing among PPTA nanofibrils at about 500 °C. At this temperature and above, a film coating the fibre developed. This layer was much less rigid than PPTA, and remained deposited on the fibres, even at high temperatures. At 800 °C, the STM images showed a surface distribution typical of a carbonaceous material, isotropic although somewhat heterogeneous. When an intermediate isothermal step (500 °C, 200 min) was introduced along with heat treatment of PPTA under a constant rate, the material obtained at the end of this step was conductive enough to be studied by STM. Although the coating over the fibres also remained after the isothermal step, it was less homogeneous than in the absence of isothermal treatment. On further heating, the residue exhibited a surface morphology typical of a carbonaceous material, but much more homogeneous and isotropic than in the absence of the isothermal step.

    Original languageEnglish
    Pages (from-to)702-707
    Number of pages6
    JournalPolymer Degradation and Stability
    Volume95
    Issue number4
    DOIs
    Publication statusPublished - 2010 Apr

    Keywords

    • Atomic force microscopy
    • Chars
    • Poly(p-phenylene terephthalamide)
    • Scanning tunnelling microscopy

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Polymers and Plastics
    • Materials Chemistry

    Fingerprint

    Dive into the research topics of 'A study of the surface morphology of poly(p-phenylene terephthalamide) chars using scanning probe microscopy'. Together they form a unique fingerprint.

    Cite this