Polymers, methacrylates functional group modified

This study is devoted to the investigation of porous methacrylate polymeric systems filled with chemically modified fumed silicas. IR and 13C NMR spectroscopies combined with AFM was applied to characterize changes in the material structure, and also the effect of surface functional groups of inorganic particles on the polymer-filler interaction. 

The polymer may be modified with functional or reactive groups in a reactor or an extruder, via reactive extrusion. Polyolefin modified with maleic anhydride, acrylic acid, glycidyl methacrylate, acid groups neutralized with a metal cation (ionomer), itaconic acid, or anhydride or similar compounds have been widely reported as compatibilizers because these groups have the ability to form a chemical linkage or a polar or ionic interaction with polar polymers such as polyamides (PAs), polyesters, and others. 

Thiol-ene coupling was also used for the end-functionaHzation of PNIPAM in an analogous study conducted by the groups of Lowe and Hoyle [55]. In this case, PNIPAM was prepared by RAFT polymerization, followed by the aminolysis of the thiocarbonylthio end group to produce a terminal thiol simultaneous Michael addition with aUyl methacrylate yielded the alkene mono end-functional PNIPAM. The polymer terminus was then modified via a radical thiol-ene dick reaction with three different mercaptans to afford a series of PNIPAM polymers with varied LCSTs (Scheme 30.5). 

Different types of water-based emulsions are used in EPI adhesives. The most common are poly(vinyl acetate) (PVAc) emulsion, ethylene vinyl acetate (EVAc) emulsion, vinyl acetate-acrylate copolymerized (VAAC) emulsion, acrylic-styrene (AcSt) emulsion or styrene-butadiene rubber (SBR) latex or modified versions of these emulsion types [1, 8, 9], It has also been reported that tri- or ter-polymer emulsions like vinyl acetate-butyl acrylate-hydroxypropyl methacrylate or emulsions with different combinations of block copolymers can be used [4], Emulsion polymers containing cross-linking functional groups are especially well suited [4,6, 9]. The choice of emulsion(s) will, to a large extent, influence the adhesive properties such as setting time, bond quality, heat resistance, and moisture resistance. EPI adhesive systems are, however, very complex and the total composition (including the choice of cross-linker) and the interaction between the different components will determine the properties of the adhesive. Due to this it is difficult to describe in detail the effect of choosing one type of emulsion over the other. 

Here advantage is taken of modification by swelling and adsorption of chemically reactive modifiers and catalysts into the polymer to generate different functional groups. It has been shown that the pendant hydroxyl groups of polyvinyl alcohol (PVA) and poly-2-hydroxy propyl methacrylate can partially be reacted with acetic or benzoic anhydride or phenyl isocyanate to form new structures [44], to form side groups with ester linkages. As a result a copolymer of is produced ... 

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