Hexamethylenediisocyanate IPDI Isophoronediisocyanate MDI Methylenediphenyldiisocyanates NMR nuclear magnetic resonance PU Polyurethane TDI Toulenediisocyanates TGA Thermogravimetric analysis
Recording formats are 3G-SDI, HD-SDI, HMDI
The evaluation is being made on both the neat PUs of TDI and HMDI
and their corresponding biocomposites with silk fiber.
Aminated PVC, 1 g was dissolved in 25 ml dry THF in a 100 ml round-bottomed flask, 2 ml of HMDI
was added, stoppered and the mixture was stirred magnetically for 1 h at room temperature.
has been reported (35) to possess an inherently higher thermal stability than that of other urethane linkages, such as MDI, as the latter is reported to dissociate at about 200[degrees]C.
This should be due to the lower reactivity of TMXDI with respect to water as compared with IPDI and HMDI
TSA]/PU mixture was carried out at 70[degrees]C under nitrogen atmosphere by previously mixing castor oil and SPAN and further addition of HMDI
In this article, the aqueous polyurethane dispersions derived from HMDI
, various polycarbonatediols and various carboxylic diols were prepared by our newly developed method.