Synthesis of copolyurethane-ureas containing nickel and zinc 4,4'-dihydroxysaltrien complexes in the presence of dialcohols or diamines / Prakaywan Tachaprasertporn = การสังเคราะห์โคพอลิยูรีเทน-ยูเรียที่มีสารประกอบเชิงซ้อนนิกเกิลและซิงก์ 4,4'-ไดไฮดรอกซีซาลไทรเอ็นโดยมีไดแอลกอฮอล์หรือไดแอมีน / ประกายวรรณ เตชะประเสริฐพร
4,4’-Dihydroxysaltrien metal complexes (ML, where M = Zn2+and Ni2+) were synthesize from the reaction between 2,4-dihydroxybenzaldahyde, metal (II) acetate and triethylenetetramine at the mole ratio of 2:1:1. These metal complexes were characterized by IR and NMR. The metal complexes were used for the synthesis of copolyurethane-ureas containing nickel and zine 4,4’-dihydroxysaltrien complexes in the presence of dialcohols or diamines. They were done by polymerization of 4,4’-dihydroxysaltrien metal complexes (ML), 4,4’-methylenebis(phenyl isocyanate) (MDI) and various diamines or diols. The diamines used were methylenedianiline (MTDA) and hexamethylenediamine (HMDA). The diols employed were bisphenol A (BA) and 1,6-hexanediol (HD). Dibutyltin dilaurate (DBTDL) was used as a catalyst. The polymers were characterized by IR, NMR. Moreover, the solubility and viscosity were used for characterization a well. Thermal properties were determined by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Flammability of the polymers was studied by measuring limiting oxygen index (LOI). It was found that the copolyurethane-ureas showed high thermal stability and good solubility in polar organic solvents.
