Polymerization of diphenylacetylenes having very bulky silyl groups and polymer properties

✍ Scribed by Masahiro Teraguchi; Toshio Masuda

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 133 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19981115)36:15<2721::aid-pola7>3.0.co;2-5

✦ Synopsis

Polymerization and polymer properties of 1-phenyl-2-[4-(triphenylsilyl)phenyl]acetylene (pPh 3 SiDPA) and 1-phenyl-2-[4-(triisopropylsilyl)phenyl]acetylene (piPr 3 SiDPA), which have very bulky silyl groups, were examined. These monomers polymerized in good yields in the presence of TaCl 5 -based catalysts. The highest weight-average molecular weights of poly(pPh 3 SiDPA) and poly(piPr 3 SiDPA) reached about 1 ϫ 10 6 and 4.8 ϫ 10 6 , respectively. The polymers were yellow to orange-colored solids which were soluble in toluene, chloroform, etc., and provided free-standing films by solution casting. The onset temperatures of weight loss of poly(pPh 3 SiDPA) and poly(piPr 3 SiDPA) in TGA in air were 430 and 270°C, respectively. The oxygen permeability coefficients of poly(pPh 3 SiDPA) and poly(piPr 3 SiDPA) at 25°C were 3.8 and 20 barrers, respectively, and relatively small.