Detail of "25190-06-1"

Reference

Phase diagrams and morphology of a urethane model hard segment and polyether macroglycols

Phase diagrams and morphology of a urethane model hard segment and polyether macroglycols. Hwang, Kirk K. S.; Hemker, David J.; Cooper, Stuart L. (Dep. Chem. Eng., Univ. Wisconsin, Madison, WI 53706, USA). Macromolecules, 17(3), 307-15 (English) 1984. CODEN: MAMOBX. ISSN: 0024-9297. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Section cross-reference(s): 68 Binary mixts. of a urethane hard-segment model [di-Et (methylenedi-p-phenylne)dicarbamate (I) [10097-16-2]] with 3 polyoxyalkylenes were studied by DSC, wide-angle x-ray diffraction, and optical microscopy. Polyethylene glycol (II) [25322-68-3] (1500 mol.Several reagents with their cas registry numbers 10097-16-2 and 25322-68-3 are used here. wt.) and polytetramethylene glycol (III) [25190-06-1] (1000 mol. wt.) formed eutectics ( I-II and I-III). Polypropylene glycol (IV) [25322-69-4] (1000 mol. wt.) and I gave a cryst.-amorphous blend. X-ray diffraction showed that the polyethers did not change the crystal structure of I in the blends, suggesting that the m.p. depression resulted from I-polyol thermodn. mixing. Scott's equation gave interaction parameter d. for I-II, I-III, and I-IV -4.63, -3.42 and -1.21 cal/mL, resp., at the I m.p. Optical microscopy showed that I spherulites were larger and more perfect in texture in blends than in pure I. .

Polytetramethylene glycol with narrow molecular weight distribution

Polytetramethylene glycol with narrow molecular weight distribution. (Mitsubishi Chemical Industries Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58204026 A2 28 Nov 1983 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G065-20; C08G065-32. APPLICATION: JP 82-88189 25 May 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Polytetramethylene glycol (I) [25190-06-1] having narrow mol. wt. distribution is prepd. by polymg. THF in the presence of HSO3F and BF3 and hydrolyzing the polymer. Thus, 60 g HSO3F was added dropwise to a mixt. of 720 g THF and 62.6 g BF3, stirred 1 h at 45°, poured into 1000 g H2O at 60°, and heated 3 h at 98° to give 322.There are some commonly used reagents with their cas registry numbers 7637-07-2 and 7789-21-1 in this article.4 g I having no.-av. mol. wt. 1760 and polydispersity 1.63. .