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Novel low dielectric constant (low-k) polycarbosilanes with tunable performance are reported in the present work. These well-defined linear-cyclopolycarbosilanes were prepared via the copolymerization of 1,5-hexadiene (1,5-HD) with 3,3-dimethyl-3-sila-1,5-hexadiene (DMSHD) using dimethyl(pyridylamido) hafnium/[Ph3C][B(C6F5)4]/AliBu3 catalytic system. They exhibited excellent dielectric properties...
Novel terpolymers containing ethylene, 1-hexene and dicyclopentadiene (DCPD) were synthesized using bis(β-enaminoketonato)titanium catalysts [PhNC(R 2 )CHC(R 1 )O] 2 TiCl 2 (1a: R 1 = Ph, R 2 = CF 3 ; 1b: R 1 = CF 3 , R 2 = CH 3 ). In the presence of modified methylaluminoxane, these catalysts afforded terpolymers...
The strong polar group, carboxylic acid, has triumphantly been introduced into ethylene and allylbenzene copolymers without obvious degradation or crosslinking via Friedel–Crafts (F–C) acylation reaction with glutaric anhydride (GA), succinic anhydride (SA) and phthalic anhydride (PA) in the presence of anhydrous aluminum chloride in carbon disulfide. Some important reaction parameters were examined...
The branched copolymers prepared from ethylene and α-olefins using rac-Et(Ind) 2 ZrCl 2 /MMAO catalyst system were studied. Both the absolute molecular weight (M¯w) and the molecular size (radius of gyration, R g ) of the polymers eluting from gel permeation chromatography (GPC) columns were obtained simultaneously via a high temperature GPC coupled with a two-angle laser light...
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