𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Effect of curative and stoichiometry on the hysteresis in polyurethane-ureas

✍ Scribed by R. A. Beck; R. W. Truss

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
150 KB
Volume
71
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

Hysteresis in the fifth loading cycle has been measured for a series of polyurethane-ureas based on polytetramethylene glycol (PTMEG), toluene diisocyanate (TDI), and two different amine chain extenders/curatives, methylenebisortho chloroanaline (MBOCA) and a dimethylthio toluene diamine (Ethacure 300, Ethyl Corp.). Hysteresis was seen to increase with strain and temperature in all samples. However, the increase in hysteresis with strain was limited by crosslinking of the hard domains and these materials also showed decreased temperature dependence at higher temperatures. These results are discussed in terms of the structure of the polymers and possible mechanisms leading to hysteresis.

πŸ“œ SIMILAR VOLUMES

Inhibitory Effects of Fungicides on Hydr
Inhibitory Effects of Fungicides on Hydrolysis of Urea and Nitrification of Urea Nitrogen in Soil
✍ Martens, Dean A.; Bremner, John M. πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 207 KB πŸ‘ 1 views

The inΓ‘uence of 1 and 50 mg active ingredient (AI) kg~1 soil of 17 fungicides on transformations of urea nitrogen in soil was studied by determining the amounts of urea hydrolysed and the amounts of nitrate and nitrite produced when samples of two coarse-textured and two Ðne-textured soils were incu

Cyclic Ureas, III: On the Metabolism of
Cyclic Ureas, III: On the Metabolism of the Enantiomers of Cyclic Ureas in Rats
✍ Hans H. Maurer; Joachim Biwersi; Joachim Knabe πŸ“‚ Article πŸ“… 1993 πŸ› John Wiley and Sons 🌐 English βš– 271 KB πŸ‘ 1 views

## Abstract Studies are described on the metabolism of the enantiomers of 1, 2, and 3 in rats. The metabolites were identified in urine after cleavage of conjugates and extraction using gas chromatography‐mass spectrometry. Qualitative enantioselective differences of the metabolism of 1, 2, and 3 c