ISSN:
0887-624X
Schlagwort(e):
poly(diphenylacetylene)
;
tantalum catalyst
;
metathesis polymerization
;
thermal stability
;
gas permeability
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Polymerization and polymer properties of 1-phenyl-2-[4-(triphenylsilyl)phenyl]acetylene (pPh3SiDPA) and 1-phenyl-2-[4-(triisopropylsilyl)phenyl]acetylene (piPr3SiDPA), which have very bulky silyl groups, were examined. These monomers polymerized in good yields in the presence of TaCl5-based catalysts. The highest weight-average molecular weights of poly(pPh3SiDPA) and poly(piPr3SiDPA) reached about 1 × 106 and 4.8 × 106, 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(pPh3SiDPA) and poly(piPr3SiDPA) in TGA in air were 430 and 270°C, respectively. The oxygen permeability coefficients of poly(pPh3SiDPA) and poly(piPr3SiDPA) at 25°C were 3.8 and 20 barrers, respectively, and relatively small. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 2721-2725, 1998
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
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