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Poly cure reactions

Bismaleimides are best defined as low molecular weight, at least diftinctional monomers or prepolymers, or mixtures thereof, that carry maleimide terminations (Eig. 3). Such maleimide end groups can undergo homopolymerization and a wide range of copolymerizations to form a highly cross-linked network. These cure reactions can be effected by the appHcation of heat and, if required, ia the presence of a suitable catalyst. The first patent for cross-linked resias obtained through the homopolymerization or copolymerization of BMI was granted to Rhc ne Poulenc, Erance, ia 1968 (13). Shordy after, a series of patents was issued on poly(amino bismaleimides) (14), which are synthesized from bismaleimide and aromatic diamines. [Pg.23]

Method 1 Poly (ethylene glycol) dimethacrylate (23G), and phenolic resol (PR) were mixed at 50°C for 10 minutes and dicumyl peroxide (DCP) was added. The polymerization and phenolic curing reactions then took place simultaneously at 170°C for 90 minutes in 200mm x 10mm x 1.5mm stainless steel mold. This product was called IPN 1. [Pg.433]

Properties of vinyl compound/phenolic IPN were discussed and the following conclusions drawn. MMA radical polymerization proceeded rapidly in the presence of phenolic resol. Poly (ethylene glycol) dimethacrylate, 23G, and phenolic resol IPNs were synthesized by simultaneous radical polymerization and phenolic resol curing reaction. These IPNs had a structure of poly 23G chains and cured phenolic resol chains so well entangled with each other that the whole acted as a single phase. This type of IPN is considered to... [Pg.443]

Poly-AMMO is synthesized via cationic polymerisation from the monomer 3-azidomethyl-methyl-oxetane (AMMO). The polymerisation reaction is quenched with water to get polymer chains with hydroxyl endgroups which enable to react these pre-polymers later with isocyanate for curing reaction. Poly-AMMO is suggested as - energetic binder component in -< composite propellants and is in the scope of actual research. [Pg.257]

The synthesis and structure of MQ resins have been described above. The poly(siloxane) network is traditionally derived by free-radical cross-linking of a high molecular weight PDMS polymer or gum using a peroxide catalyst, such as benzoyl peroxide or 2,4-dichlorobenzoyl peroxide. The curing reaction is performed immediately after the PSA has been coated onto a tape substrate, such as PET, PTFE, or Kapton. Uncured PSAs are supplied as a solution in an organic solvent. Some silicone PSAs also incorporate phenyl groups onto the gum portion of the adhesive to increase the use temperature. [Pg.57]

Figure 18. Ea dependencies for Figure 19. Effect of a nitro-group in thermal (squares) and thermo- amines on the Ea values for the oxidative (pentagons) degradation of epoxy-amine curing reaction. poly(styrene)... Figure 18. Ea dependencies for Figure 19. Effect of a nitro-group in thermal (squares) and thermo- amines on the Ea values for the oxidative (pentagons) degradation of epoxy-amine curing reaction. poly(styrene)...
An interesting trend is the increasing use of in situ NMR to study polymerization kinetics, curing reactions, or to determine the comonomer reactivity ratios (127). High-pressurCy high resolution NMR has been employed to study polymer/solvent interactions in poly(l,l-hydroperfluorooctyl acrylate) and its copolymer with styrene (128). [Pg.9]

From the T S/h) vs T h/r) plot for the curing reaction of hydroxyl-terminated poly(tetrahy-drofuran) lelechelic oligomer with styrene illustrated in Figure 3.18 at a heating rate of... [Pg.55]

Until comparatively recent times polymers have been utilized almost exclusively as materials so that greater interest has been focused on their physico-mechanical properties than on their chemical properties. The exceptions to this rather sweeping generalization are cases where a certain polymer could be prepared only by a chemical transformation of a precursor or where desired physical properties in a polymeric material could be developed only by alterations to the molecular architecture. For example, poly(vinyl alcohol) has been prepared on a commercial scale for many years by hydrolysis (or alcoholysis) of poly(vinyl acetate), whilst most applications of natural and many synthetic rubbers are feasible only after some crosslinking or curing reaction - processes which are still the subject of chemical investigation. [Pg.350]

Curing Reaction of Bisphenol A Diglycidyl Ether with Poly adipic acid... [Pg.87]

Diacyl peroxides are used in a broad spectmm of apphcations, including curing of unsaturated polyester resin compositions, cross-linking of elastomers, production of poly(vinyl chloride), polystyrene, and polyacrjlates, and in many nonpolymeric addition reactions. [Pg.223]


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See also in sourсe #XX -- [ Pg.72 ]




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Curing reactions

Poly reaction

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