Reference

p-Phenylene sulfide polymers

p-Phenylene sulfide polymers. Campbell, Robert W. (Phillips Petroleum Co., USA). U.S. US 4039518 2 Aug 1977, 4 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08F028-00. NCL: 260079100. APPLICATION: US 75-581330 27 May 1975. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) The mol. wt. of poly(p-phenylene sulfide) (I) [25212-74-2] obtained by contacting p-Cl2C6H4 (II) with Na sulfide (III) in the presence of N-methyl-2-pyrrolidone (IV) [872-50-4] was increased by addn. of either Li2CO3 [554-13-2] or Li metaborate [13453-69-5] to the polymn. mixt. Thus, 0.51 mol II in 40 g IV was added to a dehydrated mixt. of 0.5 mol. III, 0.5 mol Li2CO3, and 158.3 g IV and the mixt. was heated 3 h at 265.degree./80-120 psig and worked up to give 50.6 g I having melt flow 1447 (ASTM D 1238-70), inherent viscosity 0.20 (0.4 g/dL .alpha.-ClC10H7 at 206.degree.), glass transition temp. 85.degree., and cryst. m.p. 283.degree.. For I prepd. similarly but the absence of Li2CO3 the values were 3843, 0.16, 84.degree., and 285.degree., resp.

Development of fluxes for the analysis of ceramic materials by x-ray fluorescence spectrometry

Development of fluxes for the analysis of ceramic materials by x-ray fluorescence spectrometry. Bennett, H.; Oliver, G. J. (Br. Ceramic Res. Assoc., Stoke-on-Trent, Engl.). Analyst (London), 101(1207), 803-7 (English) 1976. CODEN: ANALAO. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 53, 79 Selection of a suitable flux for minerals or refractories is governed by the amt. of acidic or basic oxides in the sample. A preponderance of acidic oxides indicates the use of LiBO2 [13453-69-5] whereas a high basic oxide content requires Li2B4O7 [12007-60-2] as the flux. A suitable universal flux for samples contg. SiO2 and/or Al2O3 as major components is a 1 + 4 mixt. of LiBO2 and Li2B4O7.