Details

Autor(en) / Beteiligte

• Asano, Atsushi
• Koyama, Hiroyuki
• Suzuki, Akihiro

Titel

Crystal growth of PPS nanofibers during annealing studied by solid‐state 13C CPMAS NMR

Ist Teil von

• Journal of applied polymer science, 2022-03, Vol.139 (10), p.n/a

Ort / Verlag

Hoboken, USA: John Wiley & Sons, Inc

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Initial crystalline phase growth property for poly(p‐phenylene sulfide) (PPS) nanofibers during annealing are studied by means of the 13C high‐resolution solid‐state cross‐polarization/magic‐angle‐spinning NMR (13C CPMAS NMR) with spectral editing procedure using the difference in 1H spin‐lattice relaxation time in the rotating frame (T1ρH) between the crystalline and non‐crystalline phases. The PPS nanofibers are prepared by drawing the solid microfibers melted by a high‐power carbon dioxide (CO2) laser with supersonic jet velocity of 300–600 ms−1 in a vacuum chamber (CLSD method). The crystallinity and molecular orientation of the pristine drawn PPS nanofibers increase with decrease of the chamber pressure (pch). The growing process and the ordered chain packing of the crystalline phase during annealing depend on the initial chain orientation. The low pressures at pch = 30 and 10 kPa significantly relate to the initial nucleation growth of the PPS nanofibers. In the initial crystal growth of PPS nanofibers obtained at pch = 30 kPa for the low temperature annealing, the rearrangement of chains occurs, but for those at pch = 10 kPa the rearrangement does not occur. This is because the highly ordered chain alignments and packing are already achieved for PPS nanofibers obtained at pch = 10 kPa.