Poly formaldehyde

When the formaldehyde concentration at the start is high (36 weight %), the product is a mixture of poly(formaldehyde) and a formaldehyde/thioformaldehyde copolymer. 

Poly formaldehyde or Polyoxymethylene. It can be represented by formulas (HCHO)n or H0(CH20)oH in which n is equal to 6- It is wh solid with si odor of formaldehyde insol in ale, eth or w sol in strong alkali solns. 

Poly(formaldehyde) + F2] /a-(Nonafluoi o-butyl)-ru-(nona-fluoro-butyloxy)- ElOa, 168... 

Preparation of the title compound by interaction of dimethyl sulfoxide and bromo-methane, sealed into a resin-coated glass bottle and heated at 65°C, led to an explosion after 120 h. The isolated salt thermally decomposes above 180°C to produce formaldehyde and a residue of methanesulfonic acid. In solution in dimethyl sulfoxide, the salt begins to decompose after several hours at 74—80°C (after exposure to light), the exothermic reaction accelerating with vigorous evolution of vapour (including formaldehyde and dimethyl sulfide), the residue of methanesulfonic acid finally attaining 132°C. Some white solid, probably poly-formaldehyde, is also produced. The explosion... 

Poly (methylstyrene), mixed isomers Polystyrene, atactic Poly (formaldehyde)... 

By convention, polymers whose main chains consist entirely of C—C bonds are generally classified as addition polymers while those in which hetero atoms (O, N, S, Si) are present in the polymer backbone are considered to be condensation polymers. [An exception is poly formaldehyde (1-12), which is an addition polymer.]... 

In order to follow the fate of SnCl4 during the initiation of formaldehyde polymerization at —78°C in toluene, the polymer suspension was filtered at low conversion. After 2 min reaction time, no tin could be detected in the filtrate, all the tin being adsorbed on the polymer. The same result was obtained in BF3. etherate initiated formaldehyde polymerization in toluene all the boron was adsorbed by the polymer. This result could mean that initiation is almost instanttmeous and all the initiator was used for initiation. Alternatively, the initiator could have been partially used for initiation but the rest of the initiator was quantitatively adsorbed by the polymer formed. Adsorption experiments showed that SnCl4 at —78° in toluene is only adsorbed to an extent of 25% after 120 min on high surface area poly formaldehyde. These experiments still do not exclude the possibility that a substantial portion of all SnCl4 in toluene is coordinated to the initially formed polymer and only a small portion is transformed into the actual initiator. 

Delrin (DuPont TM) is a stabilized poly-formaldehyde. The monomer is produced by... 

In 1947, Du Pont began a development program on the polymerization and stabilization of formaldehyde and its polymer. Twelve years later, Du Pont brought the unzipping tendency under control with proprietary stabilizers and commercially announced Delrin polyacetal polymer (Figure 3). The key to the stabilization of poly formaldehyde resins appears to be a blocking of the terminal... 

USE As intensifter in photography as brominating agent in organic Synthesis as humidity indicator as wood preservative in solid-electrolyte battery as stabilizer for acetylated poly Formaldehyde. 

Poly(formaldehyde-co-phenol) (acetylated) 2200 ethyl acetate 298.15 4.0 1992KI1... 

Copoly(Butadiene - Styrene) de j no 631-0001 see Poly(Formaldehyde - Melamine) 631-... 

Syn. For-1,l4,5- Benzenetetracarboxylic- see Poly(Formaldehyde - Phenol), Rosin Modified 631-... 

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