Fluoroalkyl end-capped acrylic acid oligomer

SCHEME 4.2 Synthesis of two fluoroalkyl end-capped acrylic acid oligomer by using fluoroalkanoyl peroxide. 

Fluoroalkyl end-capped acrylic acid oligomer [Rp—(CH2CHCOOH) —Rp/Si02l [Rp—(ACA) —Rp]/silica nanocomposites decompose completely at 800°C to afford the weight loss in proportion to the content of Rp—(ACA) —Rp oligomer in composites due to the nonformation of ammonium hexafluorosihcate during the calcination... 

Fluoroalkyl end-capped acrylic acid oligomer [Rp—(ACA) —Rp] can also react with (TEOS) and silica nanoparticles in the presence of low molecular weight aromatic compounds [Ar—H] such as cetylpyridinium chloride (CPC) and bisphe-nol AF under alkaline conditions to afford Rp—(ACA) —Rp/Si02 nanocomposites-encapsulated Ar—H in excellent to moderate isolated yields (see Scheme 4.7) [49],... 

These fluorinated silica nanocomposites-encapsulated Ar—H can exhibit no weight loss behavior corresponding to the contents of Ar—H even after calcination at 800°C, although fluoroalkyl end-capped acrylic acid oligomer in the nanocomposites decomposed completely under similar conditions [49]. 

Polyaniline (PAn)/inorganic composites have been considered as new class of materials due to their improved properties compared with those of pure conducting polymers and inorganic materials [73-77]. For example, the combination of electrical conductivity of PAn and UV sensitivity of anatase Ti02 are expected to find applications in electrochromic devices, nonlinear optical system, and photochemical devises [73], From this point of view, it is in particular interest to prepare fluoroalkyl end-capped oligomers/PAn/titanium oxide nanocomposites. In fact, fluoroalkyl end-capped acrylic acid oligomer [Rp—(ACA) —Rp]/, 2-methacryloyloxyethane sulfonic acid oligomer [Rp—(MES) —Rp]/, 2-acrylamido-2-methylpropanesulfonic acid... 

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