Study On Low Viscosity And High Char Yield Phenolic Resins Modified By Calixarenes

Resorcinarenes, p-tert-Butylcalix[4]arene and oxazine derivative from Resorcinarenes were synthesized respectively and their molecular structure and performace were characterized by FTIR,H-NMR as well as DSC.A low viscosity resole was synthesized catalyzed by the compound of sodium hydroxide and potassium hydroxide ,then another resole was synthesized catalyzed by ammonia. The relationship of raw material ratio and the resole viscosity was discussed ,and their molecular weight and molecular weight distribution were characterized by GPC. Based on the two resoles , a certain proportion solvent ethanol , or reactive diluent such as benzaledhyde, salicylic aldehyde, furfuryl alcohol and furfural was added respectively in the two resoles obtaining various resole systems where different calixarenes were added further .The viscosity of various systems was measured by Bookfield viscosity meter.The cure characteristics of various resole systems added different reactive diluent and (or) calixarenes were researched by DSC. thus assuming cure mechanism and determinating cure technology. Thermal performances of various cured resole systems were studied by TGA which showed two resoles added respectively 10% oxazine derivative where salicylic aldehyde as a reactive diluent both have high similar char yield , performed in nitrogen atmosphere the char yield at 700℃ is about 70% which is higher 11% than general resoles catalyzed by ammonia.Finally, the thermal decomposition kinetics and thermal ageing lifetime of resole having the highest char yield were researched and estimated by TGA ,meanwhile the rheological behaviors were researched. Key words: calixarenes; resole; low viscosity; reactive diluent; char yield...