SYNTHESIS AND CHARACTERIZATION OF POLYURETHANES OBTAINED FROM POLYOLS DERIVATED FROM CASTOR OIL WITH DIFFERENT PROPORTIONS OF FLAME RETARDANT

Abstract

Polyurethanes  were  synthesized  from  polyols  derived  from  castor  oil  (CO)  and  isophorone  diisocyanate  (IPDI)  with NCO/OH=1;  different  flame  retardants  were  added  in  different  proportions.  Polyols  (P0  and  P1)  were  obtained  from  a transesterification reaction of castor oil with pentaerythritol. It was added to the polyurethanes additives such as aluminum hydroxide (AH) and molybdenum oxide (OM) in order to evaluate the effect as flame retardant.  Thermal degradation and combustion  reactions  were  investigated  using  thermogravimetric  analysis  (TGA)  and  differential  scanning  calorimetric (DSC).  The  change  in  the  mechanical  properties  such  as  stress/strain  and  shore  A  hardness  were  evaluated  with  and without additives. Aluminum hydroxide (AH) has better characteristics as flame retardant then molybdenum oxide for the polyurethanes obtained from castor oil modified.