18036-95-8Relevant academic research and scientific papers
Polymeric organosilicon systems. XXIX. Thermal properties of poly[(disilanylene)oligophenylenes]
Ohshita, Joji,Sugimoto, Kazunori,Watanabe, Tsuguo,Kunai, Atsutaka,Ishikawa, Mitsuo,Aoyama, Susumu
, p. 47 - 56 (1998)
Thermal properties of variously substituted poly[(disilanylene)oligophenylenes], [(SiR1R2SiR1R2)(p-C6H4)m]n (R1=R2=Me, R1=R2=Et, and R1=Ph, R2=Me, m=1-4) were investigated. The thermogravimetric analysis of the polymers in the range of 20-1000°C showed rapid weight loss starting from about 400°C. The total weight loss of the polymers at 1000°C was calculated to be 54.5-75.5% based on the initial weight of the polymers. GC-MS analysis of the volatile products obtained from the pyrolysis of the polymers with R1=R2=Me, m=2 and R1=R2=Et, m=1-4 at 500°C indicated the formation of silicon-containing oligomers arising from the Si-Si and Si-phenylene bond cleavage, mainly. The formation of oligophenylenes, H(C6H4)lH (l=1-4), was also observed in the pyrolysis of the polymers with m=3 and 4. A model reaction for the polymer degradation was also examined, using 1,2-diphenyltetramethyldisilane.
Extremely Active Ethylene Tetramerization Catalyst Avoiding the Use of Methylaluminoxane: [iPrN{P(C6H4-p-SiR3)2}2CrCl2]+[B(C6F5)4]?
Park, Hee Soo,Kim, Tae Hee,Baek, Jun Won,Lee, Hyun Ju,Kim, Tae Jin,Ryu, Ji Yeon,Lee, Junseong,Lee, Bun Yeoul
, p. 4351 - 4359 (2019)
Sasol's original ethylene tetramerization catalyst requires the use of expensive MMAO, a low working temperature (～60 °C), and generates polyethylene (PE) as a side product. In this study, we developed an upgraded catalytic system that successfully avoids the need for MMAO. [(PNP)CrCl2]+[B(C6F5)4]?-type species was obtained from the reaction of CrCl3(THF)3, [PhN(H)Me2]+[B(C6F5)4]?, and iPrN[P(C6H4-p-Si(nBu)3)2]2 (2) as well as from simply reacting 2 with [CrCl2(NCCH3)4]+[B(C6F5)4]?. The bulky (nBu)3Si-substituents play the crucial role of preventing the formation of the inactive [(PNP)2CrCl2]+[B(C6F5)4]?. The prepared [2-CrCl2]+[B(C6F5)4]? combined with iBu3Al was extremely active ('4000 kg/g-Cr/h), performed well at a high temperature of up to 90 °C, and generated a negligible amount of PE (0.03 wt%). Screening the performance with a series of iPrN[P(C6H4-p-SiR3)2]2 further supported that bulky R3Si-substituents are crucial not only to achieve extremely high activities but also to minimize the generation of PE. Structure of a [(PNP)CrCl2]+[B(C6F5)4]? species was elucidated by X-ray crystallography.
Novel soluble pentacene and anthradithiophene derivatives for organic thin-film transistors
Kim, Choongik,Huang, Peng-Yi,Jhuang, Jhe-Wei,Chen, Ming-Chou,Ho, Jia-Chong,Hu, Tarng-Shiang,Yan, Jing-Yi,Chen, Liang-Hsiang,Lee, Gene-Hsiang,Facchetti, Antonio,Marks, Tobin J.
experimental part, p. 1363 - 1375 (2011/04/17)
Four new solution-processable pentacene- (PEN) and anthradithiophene- (ADT) based organic semiconductors bearing two phenylethynyl (PE-) or triethylsilylphenylethynyl (TESPE-) substituents have been synthesized, characterized, and incorporated in thin-fil
Synthesis and properties of F-containing poly(diphenylacetylene) membranes
Sakaguchi, Toshikazu,Shiotsuki, Masashi,Sanda, Fumio,Freeman, Benny D.,Masuda, Toshio
, p. 8327 - 8332 (2008/02/02)
The polymerization of various silyl- and F-containing diphenylacetylenes (1a-k) with TaCl5-n-Bu4Sn provided high-molecular-weight polymers. Most polymers (2a-d, 2g, and 2h) were totally soluble in common organic solvents and afforded
