Polyacrylates chemical structure

Bisphenols is a broad term that includes many chemicals with the common chemical structure of two phenolic rings joined together by a bridging carbon. Bisphenol A is a monomer widely used in the manufacture of epoxy and phenolic resins, polycarbonates, polyacrylates and corrosion-resistant unsaturated polyester-styrene resins. It can be found in a diverse range of products, including the interior coatings of food cans and filters, water containers, dental composites and sealants. [4]. BPA and BP-5 were selected for testing by the whole... 

Figure 1. Chemical structure of polyacrylic acid and polyacrylamide monomers and sodium dodecylsulfonate.

The photo-cross-linkability of a polymer depends not only on its chemical structure, but also on its molecular weight and the ordering of the polymer segments. Vinyl polymers, such as PE, PP, polystyrene, polyacrylates, and PVC, predominantly cross-link, whereas vinylidene polymers (polyisobutylene, poly-2-methylstyrene, polymethacrylates, and poly vinylidene chloride) tend to degrade. Likewise, polymers formed from diene monomers and linear condensation products, such as polyesters and polyamides, cross-link easily, whereas cellulose and cellulose derivatives degrade easily. ... 

FIG. 6.15 Chemical structure of a discotic side-chain polyacrylate copolymer (from Franse et al., 2002, 2004). 

In this chapter, approaches to estimates of (1) the polyelectrolyte (electrostatic) effect, (2) the hydrophobicity/hydrophilicity effect, and (3) the multicoordination effect, specified for metal ion/polyelectrolyte systems are described. As weak acidic polyelectrolytes, polyacrylic acid, PAA, as well as polymethacrylic acid, PMA, are exemplified as an example of weak basic polyelectrolyte, poI y(/V-vinyI i m idazoIc), PVIm, is chosen all the chemical structures of the polymer ligands are illustrated in Figure 1. Precise poten-tiometric titration studies by the use of a glass electrode as well as respective metal ion selective electrodes have been performed for the complexation equilibrium analyses. All the equilibrium constants reported in this chapter were obtained at 298 K unless otherwise stated. 

There are two basic types of chemical structures, styrene and acryhc. The styrene-based materials described above are aromatic hydrocarbons. Acrylic resins are straight-chained hydrocarbons based on polyacrylate and polymethaciylate. DVB is still used as a cross-linker in these resins, but the acrylics differ from the styrenics in that the active exchange site is part of the physical structure. This means that their physical and chemical stabilities are intertwined. When an acrylic resin chemically degrades, it is usually at the exchange site, which is the weak link. This destroys the physical structure. As an aciyhc resin... 

The description of the behavior of the PSAs take into account the instantaneous adhesion ability as well as the cohesion developed during the separation of the substrates (for example, by peeling) with or without leaving residue. This property is called tack and can serve to describe, for example, the behavior of the repositionable adhesives. Polyacrylates are good examples to illustrate what kind of chemical structure can provide basic tack properties (O Fig. 14.21). 

Wilson, Prosser Powis (1983) studied the adsorption of polyacrylate on hydroxyapatite using infrared and chemical methods. They observed an exchange of ions and concluded that polyacrylate displaced surface phosphate and calcium, and entered the hydroxyapatite structure itself (Figure 5.2). They postulated that an intermediate layer of calcium and aluminium phosphates and polyacrylates must be formed at the cement-... 

Polyacrylic acid (PAA) was obtained from Scientific Polymers, Inc., Ontario, NY, as a secondary standard with a mass-averaged molecular weight of two million. The polyacrylamide (PAM) used was Separan MGL obtained from Dow Chemical Company, Midland, MI. Its reported molecular weight was in the range of 500,000 to 5,000,000. The monomer structures of PAA and PAM are illustrated in Figure 1. 

Bain and co-workers [115] studied the field dependence of 13C linewidths for polyacrylates crosslinked to low levels. The linewidth was directly proportional to field strength, consistent with a significant contribution from a dispersion of chemical shifts arising from new chain structures. In addition the authors used the Delays Alternating with... 

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