섬유

Dynamics and Packing of Amorphous Polymers Studied by Multidimensional Solid-State NMR.

  • 출판일2000.08
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 246
Characterization of molecular structure and dynamics in glassy polymers continues to be problematic for researchers involved in both experimental and theoretical studies. Becuase such critical properties as toughness depend on low temperature relaxation processes, knowledge of their microscopic origins is important for practical purposes. Solid state nuclear magnetic resonance (NMR) generates detailed information on segmental conformations and motions, particularly in isotopically labeled samples. Experiments focused on the dynamics and local structure of amorphous polymers with recently developed one, two, and three dimensional NMR methods. These methods included CODEX, double quantum NMR, and Measurements of long range dipolar coupling. Observations included side group motions in polymethyl methacrylate and backbone motions in polyethylene terephthalate and nearly random packing of carbonate segments in polycarbonate. 6 refs.
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