Aggregation kinetics and precipitation phenomena in poly(phenylisocyanide)
Document Type
Article
Date of Original Version
1-1-1997
Abstract
The preparation of N-phenyl -substituted poly(isocyanide) (N-Φ-PIM) utilizing a Ni(II) catalyst in methanol yields a brown material having a number average molecular weight of about 2000. Analysis of this "as prepared" polymer indicates that a rigid rod structure is present in the derived solid. Dissolution of this "as prepared" N-Φ-PIM in halocarbon solvents or THF apparently leads to unraveling of the helical polymer with subsequent aggregation and precipitation of materials that have different properties from the original. These processes have been investigated by NMR, GPC, and light-scattering techniques in THF and other solvents. UV spectrtoscopy has been utilized to follow the kinetics of the aggregation process in solution. X-ray diffraction (XRD) measurements have been employed to investigate the changes attendant with precipitation. An explanation of these observations is offered that implicates the uncoiling of the rigid rod helix as the most important step in defining subsequent physical and chemical properties of the ultimate amorphous polymer. © 1997 John Wiley & Sons, Inc.
Publication Title, e.g., Journal
Journal of Polymer Science, Part A: Polymer Chemistry
Volume
35
Issue
3
Citation/Publisher Attribution
Huang, Jiun Tang, Jingxian Sun, William B. Euler, and William Rosen. "Aggregation kinetics and precipitation phenomena in poly(phenylisocyanide)." Journal of Polymer Science, Part A: Polymer Chemistry 35, 3 (1997): 439-446. doi: 10.1002/(SICI)1099-0518(199702)35:3<439::AID-POLA6>3.0.CO;2-N.