1,2-dinitrile polymers. III. Number-average molecular weight by pulsed NMR technique

✍ Scribed by Liepins, R. ;Crist, B. ;Olf, H. G.

• Book ID: 104535410
• Publisher: Wiley (John Wiley & Sons)
• Year: 1970
• Tongue: English
• Weight: 583 KB
• Volume: 8
• Category: Article
• ISSN: 0449-296X
• DOI: 10.1002/pol.1970.150080813

✦ Synopsis

Abstract

In studies of various polymers in the solid state by pulsed and wide‐line NMR, a relationship between the spin‐lattice relaxation time and the fraction of mobile protons in the polymer sample was observed. This effect has been used to determine the degree of polymerization of a series of fumaronitrile homopolymers. The technique should have wide applicability in the direct determination of the number‐average molecular weight M̄~n~, especially for polymers that may be insoluble and/or infusible though not crosslinked.