Interphase structure of oxidized carbon fiber reinforced polyamide 6 revealed by synchrotron microbeam x-ray diffraction and infrared-spectroscopy

Daigo Kobayashi, Atsushi Takahara

Research output: Contribution to journalArticle

Abstract

Interphase molecular aggregation states of carbon fiber reinforced polyamide 6 (PA6) films were studied. DSC measurement of composites revealed that high modulus carbon fibers (HMCF(-)) and oxidized high modulus carbon fibers (HMCF(+)) effectively acted as nucleation sites in PA6 matrices during cooling from melt. Polarized optical microscopy (POM) observation revealed the presence of a ca. 2μm thick polyamide 6 transcrystalline layer with positive birefringence at the interphase region of PA6 and HMCF(-), while no clear crystal interphase layer was observed at that of PA6 and HMCF(+). The crystal form and orientation at the interphase region was further confirmed by microbeam wide angle X-ray diffraction (μWAXD) and microbeam infrared spectroscopy (μIR). The μWAXD and μIR results show that that the a axis of α crystals in the transcrystalline layer are perpendicular to the HMCF(-) fiber direction, while α-type crystals grows randomly in case of HMCF(+) interphase. One reason might be that during the oxidization process, the orientation of the HMCF surface graphite crystal may become disordered.

Original languageEnglish
Pages (from-to)91-98
Number of pages8
JournalKOBUNSHI RONBUNSHU
Volume74
Issue number2
DOIs
Publication statusPublished - Mar 1 2017

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Synchrotrons
Polyamides
infrared spectroscopy
diffraction
Carbon fibers
Infrared spectroscopy
Diffraction
crystal
X rays
Crystals
Crystal orientation
X-ray diffraction
birefringence
X ray diffraction
Graphite
Birefringence
graphite
nucleation
Optical microscopy
microscopy

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

Cite this

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title = "Interphase structure of oxidized carbon fiber reinforced polyamide 6 revealed by synchrotron microbeam x-ray diffraction and infrared-spectroscopy",
abstract = "Interphase molecular aggregation states of carbon fiber reinforced polyamide 6 (PA6) films were studied. DSC measurement of composites revealed that high modulus carbon fibers (HMCF(-)) and oxidized high modulus carbon fibers (HMCF(+)) effectively acted as nucleation sites in PA6 matrices during cooling from melt. Polarized optical microscopy (POM) observation revealed the presence of a ca. 2μm thick polyamide 6 transcrystalline layer with positive birefringence at the interphase region of PA6 and HMCF(-), while no clear crystal interphase layer was observed at that of PA6 and HMCF(+). The crystal form and orientation at the interphase region was further confirmed by microbeam wide angle X-ray diffraction (μWAXD) and microbeam infrared spectroscopy (μIR). The μWAXD and μIR results show that that the a axis of α crystals in the transcrystalline layer are perpendicular to the HMCF(-) fiber direction, while α-type crystals grows randomly in case of HMCF(+) interphase. One reason might be that during the oxidization process, the orientation of the HMCF surface graphite crystal may become disordered.",
author = "Daigo Kobayashi and Atsushi Takahara",
year = "2017",
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doi = "10.1295/koron.2016-0054",
language = "English",
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AU - Kobayashi, Daigo

AU - Takahara, Atsushi

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Interphase molecular aggregation states of carbon fiber reinforced polyamide 6 (PA6) films were studied. DSC measurement of composites revealed that high modulus carbon fibers (HMCF(-)) and oxidized high modulus carbon fibers (HMCF(+)) effectively acted as nucleation sites in PA6 matrices during cooling from melt. Polarized optical microscopy (POM) observation revealed the presence of a ca. 2μm thick polyamide 6 transcrystalline layer with positive birefringence at the interphase region of PA6 and HMCF(-), while no clear crystal interphase layer was observed at that of PA6 and HMCF(+). The crystal form and orientation at the interphase region was further confirmed by microbeam wide angle X-ray diffraction (μWAXD) and microbeam infrared spectroscopy (μIR). The μWAXD and μIR results show that that the a axis of α crystals in the transcrystalline layer are perpendicular to the HMCF(-) fiber direction, while α-type crystals grows randomly in case of HMCF(+) interphase. One reason might be that during the oxidization process, the orientation of the HMCF surface graphite crystal may become disordered.

AB - Interphase molecular aggregation states of carbon fiber reinforced polyamide 6 (PA6) films were studied. DSC measurement of composites revealed that high modulus carbon fibers (HMCF(-)) and oxidized high modulus carbon fibers (HMCF(+)) effectively acted as nucleation sites in PA6 matrices during cooling from melt. Polarized optical microscopy (POM) observation revealed the presence of a ca. 2μm thick polyamide 6 transcrystalline layer with positive birefringence at the interphase region of PA6 and HMCF(-), while no clear crystal interphase layer was observed at that of PA6 and HMCF(+). The crystal form and orientation at the interphase region was further confirmed by microbeam wide angle X-ray diffraction (μWAXD) and microbeam infrared spectroscopy (μIR). The μWAXD and μIR results show that that the a axis of α crystals in the transcrystalline layer are perpendicular to the HMCF(-) fiber direction, while α-type crystals grows randomly in case of HMCF(+) interphase. One reason might be that during the oxidization process, the orientation of the HMCF surface graphite crystal may become disordered.

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