“…Quantitative XPS data shown in Table confirm this result by showing that no carbon atom from C⋮C is observed and 38.2% carbon atoms in the form of CC are detected on the surface of poly(1,8-dibutyl-1,3,5,7-octatetrayne) microbeads. Therefore, it can be surmised that the main reactions for the polymerization involve the conversion of sp 1 -hybridized carbon atoms in the molecule of 1,8-dibutyl-1,3,5,7-octatetrayne into sp 2 -hybridized carbon atoms by a variety of triple bond additions 21 (Scheme ) including [4+2] cycloaddition and any further cyclizations , to form graphite-like structures. 2 Triple Bond Additions and Cyclization in the Polymerization of 1,8-Dibutyl-1,3,5,7-octatetrayne…”
A self-polymerizable liquid octatetrayne, 1,8-dibutyl-1,3,5,7-octatetrayne, was heated to 80 °C and
produced cross-linked poly(1,8-dibutyl-1,3,5,7-octatetrayne) microbeads via suspension polymerization
with diameters adjustable from hundreds of micrometers to a few micrometers. Carbon microbeads that
may be useful for catalyst supports or in high-performance carbon materials were obtained by the pyrolysis
of poly(1,8-dibutyl- 1,3,5,7-octatetrayne) microbeads at 800 °C under an inert atmosphere.
“…Quantitative XPS data shown in Table confirm this result by showing that no carbon atom from C⋮C is observed and 38.2% carbon atoms in the form of CC are detected on the surface of poly(1,8-dibutyl-1,3,5,7-octatetrayne) microbeads. Therefore, it can be surmised that the main reactions for the polymerization involve the conversion of sp 1 -hybridized carbon atoms in the molecule of 1,8-dibutyl-1,3,5,7-octatetrayne into sp 2 -hybridized carbon atoms by a variety of triple bond additions 21 (Scheme ) including [4+2] cycloaddition and any further cyclizations , to form graphite-like structures. 2 Triple Bond Additions and Cyclization in the Polymerization of 1,8-Dibutyl-1,3,5,7-octatetrayne…”
A self-polymerizable liquid octatetrayne, 1,8-dibutyl-1,3,5,7-octatetrayne, was heated to 80 °C and
produced cross-linked poly(1,8-dibutyl-1,3,5,7-octatetrayne) microbeads via suspension polymerization
with diameters adjustable from hundreds of micrometers to a few micrometers. Carbon microbeads that
may be useful for catalyst supports or in high-performance carbon materials were obtained by the pyrolysis
of poly(1,8-dibutyl- 1,3,5,7-octatetrayne) microbeads at 800 °C under an inert atmosphere.
“…9 However, its low solubility and crystalline nature make it difficult to form a stable thin film. 10 Several studies have been carried out to solve this problem. Stille and Whitesides incorporated a solubilizing aliphatic side group.…”
Section: Introductionmentioning
confidence: 99%
“…Poly( m -diethynylbenzene), discovered initially in the early 1960s by Hay and co-workers, was chosen in this study as a starting material because of its high thermal stability, low moisture pickup, low dielectric constant, and possible lithographic sensitivity. , Moreover, it can form a highly condensed aromatic structure after curing, which would provide high Young's modulus and hardness . However, its low solubility and crystalline nature make it difficult to form a stable thin film . Several studies have been carried out to solve this problem.…”
To achieve successful integration of low dielectric constant materials with copper lines, it is critical to develop a low dielectric constant material with good mechanical properties. A new high strength spin-on low dielectric constant polymer, poly((m-diethynylbenzene)-co-(triethynylbenzene)), has been developed. Its oligomer showed good solubility, high thermal stability, low moisture pickup, and strong UV absorption. The cured polymer thin film displayed a dielectric constant of 2.7 at 1 MHz and a dielectric breakdown strength larger than 230 V/µm. It had an extraordinarily high Young's modulus of 16.8 GPa and a hardness of 3.5 GPa. Compared to polyimide, it had stronger adhesion to Si and tantalum. By use of polystyrene as a porogen, a dielectric constant as low as 1.9 was obtained while still maintaining an acceptable high Young's modulus of 7.7 GPa and hardness of 2.0 GPa.
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