
%0 Journal Article
%A Hamann, SD 
%T Solid-phase polymerization of maleic anhydride at high pressures
%J Australian Journal of Chemistry
%D 1967/04/01
%V 20
%N 4
%P 605-609
%K 
%R https://doi.org/10.1071/CH9670605
%U https://www.publish.csiro.au/paper/CH9670605 
%X Solid maleic anhydride undergoes spontaneous polymerization when it is heated to 100-170°0 at pressures above 20000 atm. On a pressure- temperature diagram, the regions of monomer stability and of polymerization are separated by a rather well-defined line, which possibly marks the occurrence of a physical polymorphic transition. The structure of the polymer is discussed.   Efforts to polymerize some other 1,2-disubstituted ethylenes have been unsuccessful. The following substances were recovered unchanged after being heated to 160-180°0 at 30000-45000 atm: maleic acid, fumaric acid, crotonic acid, sorbic acid, coumarin, and trans-stilbene. The melting temperature of maleic anhydride has been measured to 3770 atm and the parameters in the Simon melting equation are reported. 
