Melamine/formaldehyde polymer

Melamine - formaldehyde polymers. Melamine (2 4 6-triamino-1 3 5-triazine), obtained by heating dicyandiamide under pressure, condenses with formalin to give melamine - formaldehyde polymers (Beetle - Melamine), which have similar uses, but better stability to heat... 

Melamine formaldehyde polymer is formed by the condensation polymerisation of melamine and formaldehyde. 

Melamine-formaldehyde polymers, 1017 Melting theory, of, 21 under the solvent, 35 Melting point, 21... 

Melamine, having three amino groups and six labile hydrogen atoms, will also form thermoset resins with formaldehyde (melamine-formaldehyde polymers). The chemistry is similar to that for the urea resins. 

Maddrell s salt 583 melamine-formaldehyde polymer 578 metaphosphates 581—584, 608, 609, 610... 

The large group of phenol-formaldehyde, urea-formaldehyde, and melamine-formaldehyde polymers are also prepared by carbonyl-addition-substitution reactions. Their final crosslinking reaction occurs in the solid state, however, the polymers are amorphous. Crystalline linear polymers have been obtained using parasubstituted phenols. But up to now only relatively low molecular weight polymers have been prepared (5). 

The synthesis of polymer adsorbents containing fullerenes on the base of fullerene -melamine - formaldehyde polymer as well as on the base of fullerene - alkoxysilane xerogel are presented in [19]. These adsorbents with relatively high specific surface area are quite thermostable up to 673 K. The main reaction for the synthesis of adsorbents was the... 

Braun, D. Ritzert, H.-J. (1989) Urea-formaldehyde and melamine-formaldehyde polymers, in Allen, G. (Ed.) Comprehensive Polymer Science, Oxford Pergamon. 

Step-growth polymerization is a very important method for the preparation of some of the most important engineering and specialty polymers. Polymers such as polyamides [7], poly(ethylene terephthalate) [8], polycarbonates [9], polyurethanes [10], polysiloxanes [11], polyimides [12], phenol polymers and resins, urea, and melamine-formaldehyde polymers can be obtained by step-growth polymerization through different types of reactions such as esterification, polyamidation, formylation, substitution, and hydrolysis. A detailed list of reaction types is shown in Table 3.2. 

Many other families of thermosetting polymers have also found their niches in the global market. Some common examples are urea-formaldehyde and melamine-formaldehyde polymers, epoxies, unsaturated polyesters (UPs), and polyurethanes (PUs). Some typical... 

Production of melamine-formaldehyde polymers involves reactions essentially similar to those of UF resins, that is, initial production of methylol derivatives of melamine, which on subsequent condensation, ultimately form methylene bridges between melamine groups in a rigid network structure (15). 

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