Studies on polyurethanes and polyurethane–ureas derived from divalent metal salts of mono(hydroxybutyl) hexolate
✍ Scribed by R Arun Prasath; P S Vijayanand; S Nanjundan
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 177 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Divalent metal salts of mono(hydroxybutyl)hexolate [M(HBH) 2 ), M=Ca 2 , Mn 2 or Pb 2 ] were synthesized by the reaction of 1,4-butanediol, 5,6,7,8,10,10-hexachloro-3a,4,4a,5,8,8a,9,9aoctahydro-5,8-methanonaphtho-[2,3-C]-furan-1,3-dione and divalent metal acetates. Hexamethylene bis [N'-(1-hydroxy-2-methyl-prop-2-yl)urea] (HBHMPU) and tolylene 2,4-bis[N '-(1-hydroxy-2methyl-prop-2-yl)urea] (TBHMPU) were synthesized by reacting 2-amino-2-methyl-propan-1-ol with hexamethylene diisocyanate (HMDI) and tolylene 2,4-diisocyanate (TDI), respectively, in toluene solvent. Flame-retardant metal-containing polyurethanes were synthesized by the solution polymerization of HMDI with M(HBH) 2 and the polyurethane±ureas by reacting HMDI with 1:1 mixture of M(HBH) 2 and HBHMPU or TBHMPU, respectively, in DMSO as solvent. The polymers have been characterized by elemental analysis, solubility, viscosity and IR and 1 H NMR spectroscopy. The thermal stability of the polymers has been studied by thermogravimetry. The ¯ame-retardant property of the polymers has been investigated by measuring limiting oxygen index values.