Premium
Solid‐state NMR study of spin finish of thermally treated PAN and PAN/CNT precursor fibers
Author(s) -
Ghoshal Sushanta,
Liu Yaodong,
Gulgunje Prabhakar,
Gupta Kishor,
Chae Han Gi,
Leisen Johannes,
Kumar Satish
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.40734
Subject(s) - polyacrylonitrile , materials science , composite number , carbon nanotube , solid state nuclear magnetic resonance , composite material , spin echo , polymer , chemical engineering , nuclear magnetic resonance , magnetic resonance imaging , medicine , physics , engineering , radiology
Dry‐jet wet‐spun polyacrylonitrile (PAN) and PAN/carbon nanotubes (CNTs) precursor fibers coated by spin finishes were characterized using the solid‐state 1 H nuclear magnetic resonance technique. Series of fiber samples were prepared upon thermal treatment at different temperatures (room temperature to 180°C). Using the Hahn echo sequence, relatively mobile components were identified and the effect of the heat treatment on those components was studied. It was observed that the mobile components are mainly the spin finishes. Heat treatment caused loss of one of the spin finishes (Type B) to a great extent (∼80%), whereas the other two spin finishes (Type A and Type C) were more stable. Additional information regarding the change in molecular mobility due to heat treatment was obtained by the spin‐lattice relaxation time ( T 1 ) analysis. It was found that the presence of CNT affects the T 1 relaxation time of the polymer in the composite fiber, however, that of relatively mobile components remains unaffected. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40734.