Reference

Two component silicone rubber

Two component silicone rubber. Herzig, Joachim (Bayer A.-G., Ger.). Ger. Offen. DE 2638452 2 Mar 1978, 26 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08G077-06. APPLICATION: DE 76-2638452 26 Aug 1976. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) The title rubbers, with good flow and mech. properties, are prepd. by mixing 20-100 parts HO-terminated siloxane [viscosity (5-1000) ′ 102 cP] with 10-50 parts pyrolytic silicic acid (surface area 350 m2/g), H2O, and (R3Si)nX (R = hydrocarbyl; X = OH, OR, halogen, S, OCOR, NH, NR; n = 1,2),adding 0-50 parts R3SiO-terminated siloxane (viscosity 5-100 cP), 0-20 parts HO-terminated siloxane (viscosity 2-50 cP), and 0-100 parts other fillers, and mixing this compn. with a mixt. of R1Si(OR)3 (R1 = C1-6 alkyl, alkoxyl) 20-50, heavy metal catalysts 1-20, and alcs. 0-50 parts. Thus, mixing HO-terminated dimethylsiloxane (viscosity 10,000 cP) 550, pyrolytic silicic acid (surface area 200 m2/g) 150, H2O 40, and HN(SiMe3)2 [999-97-3] 50 g 22 h at 130° and adding 300 g Me3SiO-terminated di-Me siloxane (viscosity 10 cP) and 20 g HO-terminated dimethylsiloxane (viscosity 30 cP) gives a compn. with viscosity 29,600 and 32,000 cP after 0 and 4 wk storage, resp. Mixing this component with 6% mixt. of (PrO)4Si [682-01-9] 330, Bu2Sn dilaurate 100, and PrOH 160 gives a rubber with curing time (tack-free) 16 h, Shore A hardness 24, tensile strength 22 kg/cm2, elongation 280%, and tear propagation resistance 5.0 kg/cm.

Preparation of a nanocomposite with Si/SiO2 core/shell structure and its use in lithium batteries

All Rights Reserved. Preparation of a nanocomposite with Si/SiO2 core/shell structure and its use in lithium batteries. Zhang, Tao; Gao, Jie; Fu, Lijun; Wu, Yuping; Wu, Haoqing (Fudan University, Peop. Rep. China). Faming Zhuanli Shenqing Gongkai Shuomingshu CN 1895999 A 17 Jan 2007, 8pp. (Chinese). (People's Republic of China). CODEN: CNXXEV. APPLICATION: CN 2010-27439 8 Jun 2006. DOCUMENT TYPE: Patent CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) Section cross-reference(s): 49 A nanocomposite with Si/SiO2 core/shell structure is prepd. by (1) mixing orthosilicate, an org. solvent, and water, and homogeneously stirring to obtain a clear and transparent soln., (2) adding Si nanoparticles to the soln., and continuously ultrasonicating to uniformly disperse Si nanoparticles in the soln., (3) heating to 50-100°, magnetically or mech. 7631-86-9 and 682-01-9 which are cas registry numbers of chemicals are mentioned. stirring for 1 min to 5 h, adding a catalyst, and stirring for 10 min to 24 h for hydrolysis and polymn. to obtain polysilicic acid gel, (4) aging the gel in air for 1 min to 14 d, then drying at 30-100°, and pulverizing the dried gel into gel powder, and (5) calcining the gel powder at 200-1,000° in an inert gas atm. to obtain the nanocomposite with stable Si/SiO2 core/shell structure. The particle sizes of the nanocomposite are several hundred nanometers or less. Li ion batteries using the nanocomposite have higher reversible capacitance and better cycle performance. .