Characterization and Study of Properties in a Polar Solvent of a Functionalized and Quaternized Poly(dimethylsiloxane-co-methyl-hydridosiloxane)
Source abstract
Abstract
Poly(dimethylsiloxane- co-methyl-hydridosiloxane) (PDMSMHS) with a OSi(CH 3) 2/OSi(HCH 3) molar ratio of 21:1 was functionalized with dimethylallylamine (DMAA) via catalytic hydrosilylation using Karstedt’s catalyst and then quaternized with 1-iodooctane. The functionalized and quaternized co-polysiloxanes (PDMSMHS-1 and PDMSMHS-QAS) were characterized using 1H, 13C and 29Si NMR. The physicochemical properties of the polymeric systems (the differential refractive index increment (dn/dc), the square root of the mean square radius of gyration \(( 1/2)\), the average molecular weight (M), and the second virial coefficient (A 2)) were measured in ethanol using gel permeation chromatography/light scattering (GPC/LS). The low percentage (3–4 %) of amino side groups has an unexpected effect on the co-polymers physicochemical properties because the A 2 experimental value for PDMSMHS-1 and PDMSMHS-QAS (8.87×10−3and 1.51×10−2molmLg −2, respectively) indicates that ethanol is a good solvent.
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Research context
OpenAlex topics: Silicone and Siloxane Chemistry · Synthesis and properties of polymers · Advanced Polymer Synthesis and Characterization
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