PHENOLIC MATERIALS VIA RING-OPENING POLYMERIZATION OF BENZOXAZINES - EFFECT OF MOLECULAR-STRUCTURE ON MECHANICAL AND DYNAMIC-MECHANICAL PROPERTIES

A series of benzoxazine compounds have been prepared from different bi functional phenols and primary amines and the molecular compositions o f the precursors are characterized by nuclear magnetic resonance, Four ier transform infrared, and size exclusion chromatography. It has been demonstrated that by design of the molecular structures of the benzox azine precursors, therefore by tailoring of the network molecular arch itectures, new phenolic materials with superior mechanical and thermal properties, and ease-of-processing characteristics can be obtained. T he characteristics of dynamic mechanical spectra of the phenolic mater ials are studied and related to their structural features. (C) 1994 Jo hn Wiley & Sons, Inc.