Detail of "7517-76-2"

Reference

The relative thermal stability of polyurethane elastomers

The relative thermal stability of polyurethane elastomers. 2. Influence of polyol-diisocyanate molar block ratios with a single and mixed diisocyanate system. Barikani, M.; Hepburn, C. (Loughborough Univ. Technol., Loughborough/Leicestershire LE11 3TU, UK). Cell. Polym., 6(1), 29-36 (English) 1987. CODEN: CELPDJ. 7517-76-2 and 108090-06-8 which are cas registry numbers of chemicals are mentioned. ISSN: 0262-4893. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Thermal stability (TS) of segmented urethane rubbers was increased by increasing poly(caprolactone diol)/TDI/1,4-butanediol block ratio. Using 1,4-cyclohexane diisocyanate(I) as a co-diisocyanate in both TDI- and 4,4'-dicyclohexylmethane diisocyanate(II)-based rubbers further improved TS. Generally, TS of rubbers based on mixed diisocyanates fell in the following order (TS decreasing): TDI + I > II + I > II. .

Blocked polyurethanes as reactive systems

Blocked polyurethanes as reactive systems. 1. Thermal dissociation as a function of the type of isocyanate and of the type of blocking agent. Study by DSC and FTIR. Le Thi Phai; Viollaz, Francois; Camberlin, Yves; Thanh My Lam; Pascauli, Jean Pierre (Lab. Mater. 7517-76-2 and 105-60-2 are also occured in this study. Macromol., Inst. Natl. Sci. Appl. Lyon, Villeurbanne F-69621, Fr.). Makromol. Chem., 185(2), 281-95 (French) 1984. CODEN: MACEAK. ISSN: 0025-116X. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) The prepn. of blocked isocyanates and their thermal dissocn. into isocyanate and blocking agent was studied by DSC and IR spectroscopy. Thermal deblocking was possible only with isocyanates blocked with e-caprolactam [105-60-2] or 2-butanone oxime [96-29-7] and not with b-keto esters. With 2-butanone oxime - the most convenient blocking agent - the dissocn. of blocked arom. isocyanates started at u 80° and was fast at 120°. With blocked aliph. isocyanates, the temp. of dissocn. was higher (u 120°). Ether or tertiary amines had only a poor catalytic effect on the dissocn., and metal naphthenates had no apparent effect. The thermal and viscosity properties for prepolymers with terminal blocked isocyanate groups were investigated. The mol. interactions decreased in the order 1,4-phenylene diisocyanate ? 4,4'-methylenediphenylene diisocyanate [101-68-8] > trans-1,4-cyclohexylene diisocyanate [7517-76-2] u tolylene diisocyanate. .