Abstract
In tha present work, it has been attempted to identify the unstable structural units in poly (dially] phthalate) (PDAP) capable of initiating the polymerization of DAP monomer at elevated temperatures. Thus, by considering the following three facts : i) the initiation capability of PDAPs depends largely on their preparation conditions, ii) poly (allyl propyl phthalate) (PAPP), the monomer of which (APP) corresponds to the mono-ene counterpart of DAP monomer, shows a high polymerizationinitiation-activity, and iii) on the IR spectrum of the highly active PADP, the characteristic absorption is clearly detected at 1760cm-1, the structural unit 1 which is introduced into the polymer chain end via the reaction shown below, is presumed as the initiation species of PDAP and PAPP.
In addition, the synthesis of the model compounds corresponding to the structural unit 1 was attempted by the reaction of phthaloyl chloride with 1, 2-ethanediol or 1, 2-propanediol. Although the isolation of the model compounds was unsuccessful, the crude products obtained were quite capable of initiating the polymerization of DAP monomer at elevated temperatures.
