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Synthesis and Thermal Properties of Regio‐ and Stereoregular Poly(silylene‐1,4‐phenylenevinylene)s
Author(s) -
Kwak Giseop,
Masuda Toshio
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20011001)22:15<1233::aid-marc1233>3.0.co;2-1
Subject(s) - phenylacetylene , polymer chemistry , polymer , polymerization , materials science , silylene , copolymer , thermal stability , cis–trans isomerism , toluene , catalysis , chemistry , organic chemistry , silicon , metallurgy , composite material
Polymerization of p ‐(dimethylsilyl)phenylacetylene in toluene at 25 and 80°C using RhI(PPh 3 ) 3 as the catalyst afforded highly regio‐ and stereoregular poly(dimethylsilylene‐1,4‐phenylenevinylene)s ( cis ‐ 3 a and trans ‐ 3 a ) containing 98% cis‐ and 99% trans‐vinylene moieties, respectively. Similarly, poly(butylmethylsilylene‐1,4‐phenylenevinylene)s ( 3 b with 91% cis‐ and 95% trans‐structures) and poly(diisopropylsilylene‐1,4‐phenylenevinylene) with 95% trans‐structure were synthesized. All polymers were soluble in common organic solvents. The trans‐type polymers showed red shifts and hyperchromic effects in the UV‐visible spectrum. The onset temperature of weight loss ( T 0 ) of cis ‐ 3 a was much higher than that of trans ‐ 3 a .