Grafting of poly acrylic

Scheme 1 Repetitive step-by-step synthetic scheme leading to formation of a hyper-branched graft of poly(acrylic acid) on a mercaptoundecanoic acid self-assembled mono-layer on a supported gold film...

Scheme 2 Photolithographic process for preparing patterned hyperbranched grafts of poly(acrylic acid)...

Another report on the sequential photografting method deals with the grafting of poly(acrylic acid) on polypropylene membranes [16]. A linear relationship between irradiation time and average... 

The grafting of poly(acrylic acid) and poly(allylamine) from the previous example was also conducted in the presence of a metallic mask... 

I. L J. Dogue, N. Mermilliod, A. Gan-DiNi, Modification of Industrial Polypropylene Film by Grafting of Poly(acrylic acid). Journal of Apydied Polymer Science 56 (1995) 33. 

Research Focus Preparation of poly acrylate viscosity improvers containing grafted iV-phenyl-p-phenylenediamine as an antioxidant. 

Instead of monomers, polymers in solution can be grafted on Nylon structures. Aqueous solution of poly(acrylic add) is used for impregnation of polyamide fabrics which is subsequently dried during 1 to 5hrs at 80-150° C after which cure is carried out for 15 to 60 min at 150-218° C (99). A copolymer of styrene-maleic anhydride is said to be grafted on polycaprolactam by heating at 230° C at a pressure of 25 kg/cm2 (100). 

Elastomers, prepared by free-radical initiated copolymerization of ethyl acrylate with cellulose to several hundred percent extent of grafting of poly (ethyl acrylate) onto cellulose, exhibited rubber-like behavior and second-order transition temperatures. Cellulose-poly (ethyl acrylate) elastomers had transition temperatures below —35°C, about — 20°C, and below 5°C when measured in ethyl acetate, dry air, and water, respectively (43, 44). 

Scheme 15 Reaction scheme for the synthesis of poly( acrylic acid-graft-styrene) copolymers (PAA-g-PS) according the macromonomer technique...

There was a strong possibility that initiation occurred via photosensitized formation of hydrogen peroxide on the metal oxide surface followed by desorption and subsequent photolysis of hydrogen peroxide to form free radicals. Radicals formed by this means would lead to abstraction of hydrogen from the fiber surface and subsequent grafting of poly(methyl acrylate) at these sites. 

Figure 6.17 Schematic representation of a spherical polyelectrolyte brush in which linear chains of poly(acrylic acid) (PAA) are chemically grafted onto the surface of a colloidal polystyrene (PS) particle. L denotes thickness of the PAA brush. (After Guo and Ballauff, 2000.)...

The emulsion polymerization in the third step is carried out in the presence of a water soluble monomer, such as acrylic acid. The radicals formed by the photolysis of HMEM (Fig. 6.18b) on the surface start radical chain polymerization by a grafting-from technique (see Section 6.13.3) thus generating chains of poly(acrylic acid). The polymer chains remain bound to the surface by an ester bond which can be cleaved by hydrolysis to obtain the polymer for analysis. Thus the molecular weight of the bound polymer chains can be determined which gives their contour length Lc. The thiclcness L of the brush (Fig. 6.17) attached to the surface of the particles can be deduced from the hydrodynamic radius as measured by dynamic light scattering. 

I.F. Osipenko, V. I. Marhnovicz, Grafting of the Acrylic Acid on Poly(ethylene Terephthalate). Journal of Applied Polymer Science 39 (1990) 935. 

Jia, Z.,Yong, Y., (2006) Surface Modification of Poly Acrylic Fibers (PAC) via Grafting of Soybean Protein Isolates (SPI). Iranian Polymer Journal, Vol. 15, No. 10, (October 2006), pp 789 798, ISSN 1026-1265. 

It appeared worthwhile to us to obtain further information on the contribution of the aromatic ring, first as stabilizing group for compact conformations, secondly as a site interacting in a peculiar way with dyes. In this approach, we considered that a partial grafting of L-phenylalanine (Phe) and some of its oligopeptides (Phe ) along the chain of poly(acrylic... 

The first successful result was seen in the grafting of poly(octadecyl acrylate) onto silica and its application for separation of PAHs in a reversed phase mode. The polymer is obtained by telomerization of octadecyl acrylate, initiated with 3-mercaptopropyltrimethoxysilane (Fig. 1). The following immobilization is carried out by mixing with porous silica in a suitable solvent. The resultant polymer-grafted silica shows, not only extremely high separation of PAHs, but also specific temperature dependency on the selectivity, which is induced by an ordered-to-disordered transition of the grafted polymer. The detail is described later. 

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