Thermal stability of phthalate esters

摘要: Abstract In order to clarify the mechanism conferring heat resistance on phthalate esters, those with a substituent β-carbon atom, such as bis(2-aminobutyl) phthalate, bis(2-nitrobutyl) bis(2,4-diphenylbutyl) and dineopentyl were synthesized their thermal stabilities studied by thermogravimetry differential analysis. The analytical results for these esters compared dibutyl straight alkyl chain. As temperatures required 3% weight loss of substituent, an electron-donating group (amino group) or electron-accepting (nitro atom move higher end range, effect adjacent was recognized. presence phenyl in considerably improved resistance. It is considered that high due obstruction planar configuration cis elimination hindrance formation six-membered cyclic transition state owing interaction between non-bondable molecules.