Poly l,3-bis 2’-

Preparation of crosslinked polymer containing poly(l,4-bis-(dimethyl-[3-(methacryloyloxy)propyl]silyl)benzene)... 

Poly[l,4-bis(3,4-dicarboxyphen- oxyl)benzenedianhydride-co-2,2 - dimethyl-4,4 -methylenedianiline] trichloromethane 2 423... 

This same reaction has been reproduced some years later by Burks et al. [7] and amorphous copolymers 2a and 2b were prepared, and studied as thermostable elastomers for the aeronautic industry. Copolymer 2a or poly[l,4-bis(oxydimethylsilyl)benzene dimethylsUane] exhibited a glass transition temperature Tg = - 63 °C and a very good stability at high temperature. Copolymer 2b or poly[l,4-bis(oxydimethylsilyl)benzene diphenylsilane] exhibited a Tg = 0 °C and a higher stability at high temperature. 

Sonmez, G., H. Meng, Q. Zhang, and F. Wudl. 2003. A highly stable, new electrochromic polymer Poly(l,4-bis(3, 4 -ethylenedioxy)thienyl)-2-methoxy-5,2"-ethylhexyloxybenzene. Adv Funct Mater 13 (9) 726. 

Ko, H.C., S. Kim, H. Lee, and B. Moon. 2005. Multicolored electrochromism of poly l,4-bis[2-(3,4-ethylenedioxy)thienyl]benzene derivative bearing viologen functional groups. Adv Funct Mater 15 905. 

Ruiz, J.P., J.R. Dharia, J.R. Reynolds, and L.J. Buckley. 1992. Repeat unit symmetry effects on the physical and electronic properties of processable, electrically conducting, substituted poly(l,4-bis(2-thienyl)phenylenes). Macromolecules 25 849-860. 

Larmat, E, J. Soloducho, A.R. Katritzky, and J.R. Reynolds. 2001. Electronic structure and charge transport mechanism in poly[l,4-bis(pyrrol-2-yl)phenylene]. Synth Met 124 329-336. 

Poly[l,4-bis(3-m-xylylamino-2-butenoyl)]piperazine. BAAP (5.0 g, 0.020 mole) and MXD (2.68 g, 0.020 mole) were dissolved in 150 ml dry toluene and reacted under the same conditions as described previously. After four hours a yellow precipitate formed. After 24 hours the precipitate was collected by filtration from the cooled toluene (see Table 1). 

Table 5. Physical properties of unannealed of poly[l,4-bis(carboxyphenoxy)butane anhydride]...

Like the 1,6 PA, poly[l,4-bis(p-carboxyphenoxy)butane anhydride] (1,4 PA) was also molded into cylindrical dumbbells, and baseline as well in-vitro physical properties were determined (Tables 5, 6 and 8-10). As can be seen from these tables, the yield strength and modulus is greater than that of 1,6 PA. This is as expected, since the 1,4 PA contains two less methylene groups per repeat unit. This leads to a polymeric chain, which is slightly stiffer and, therefore, causes a corresponding increase in yield strength and modulus. 

The aromatic poly(anhydride)s were also extruded into fibers. For example, a sample of poly[l,4-bis(p-carboxyphenoxy)butane] exhibiting a melting point of 190°C was extruded using an Instron capillary rheometer equipped with a 40-mil die with an L/D of 25. 

The high molecular weight polymer, poly[l,4-bis(pcarboxyphenoxy)butane anhydride], was removed from the bath, cooled to room temperature under a stream of nitrogen and isolated by deglassing and grinding. The polymer was then placed under vacuum at 50°C for 24 hours. The final yield was 25 to 30 grams (70 to 75 percent). 

Second virial coefficient of poly[l,4-bis(3,4-dicarboxyphenoxyl)benzene dianhydride-co-... 

Photolysis of poly(l,4-bis(dimethylsilyl)benzene) (4.98), [1050, 1552] poly(l,4-bis(dimethylsilyl)naphthalene (4.99) [1311], poly(2,5-bis(dimethyl-silyl)furan) (4.100) [986] and poly(2,5-bis(dimethylsilyl)thiophene) [1021] in benzene-methanol solution results in a rapid degradation of these polymers, according to the mechanism ... 

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