Detail of "10193-99-4"

Reference

Heat-resistant fluoroalkyl methacrylate polymers

Heat-resistant fluoroalkyl methacrylate polymers. (Mitsubishi Rayon Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58215410 A2 14 Dec 1983 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08F220-22; C08F002-38. APPLICATION: JP 82-97159 7 Jun 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Heat-resistant polymers are prepd. by polymg. fluoroalkyl methacrylates, and optionally comonomers, in the presence of polythiols. Thus, 2,2,2-trifluoroethyl methacrylate 100, Me methacrylate 2, pentaerythritol tetrakis(thioglycolate) (I) [10193-99-4] 0. 54802-79-8 and 28825-23-2 are cas registry numbers of chemicals which are used as reagents here.05, and AIBN 0.05 part were heated 15 h at 70° to give a copolymer [56806-67-8] with melt index 29 g/10 min, wt. loss in 20 min in air at 270° 3.5%, and n 1.416, compared with 19, 43, and 1.417, resp., with 0.3 part tert-BuSH in place of I. .

Branching in free radical polymerization due to chain transfer, 3

Branching in free radical polymerization due to chain transfer, 3. Polymerization of styrene in the presence of a tetrafunctional chain transfer agent. Ullisch, Bernd; Burchard, Walther (Inst. Macromol. Chem., Univ. Freiburg, Freiburg/Br., Ger.). Makromol. Chem., 178(5), 1427-37 (English) 1977. CODEN: MACEAK. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) The effect of neopentanetetrayl tetrakis(2-mercaptoacetate) [10193-99-4] on polymer mol. wt. was studied in the free-radical polymn. of styrene [100-42-5] at monomer conversions(.beta.) .ltoreq.25%. An apparent extent of branching was calcd. from the mol. wts. obtained with the tetrafunctional and (for comparison) a monofunctional transfer reagent at fixed .beta. and at fixed concns. of reagent groups. The apparent extent of branching passed through a max. at small values for .beta. and approached 1 for large .beta.. The decrease in the extent of branching was caused by the increasing fraction of linear polymer as the transfer agent became exhausted. The data obsd. were compared with curves calcd. from Cascade Theory using the known kinetic consts. for styrene polymn. At medium concn. of chain-transfer groups, good agreement was reached between theory and experiment, but at small chain-transfer reagent concns., the increase in mol. wt. was less than that predicted. At large concns., the increase in mol. wt. was greater than that expected by theory. The deviations were attributed to neg. and pos. substitution effects.