Polybenzyl type polymers

Abstract

The various proposed structures for polymers derived from benzyl type compounds have been discussed and the likelihood of these structures considered in the light of a study of their preparation and properties. Both the para substituted structure of Shriner and Berger and the pendant structure of Henne and Leicester were rejected chiefly on the basis of physical properties, degradation behavior, and x‐ray and infrared evidence. Flory's randomly branched structure also fails to account for the degradation behavior and the infrared spectrum. A new configuration which is a nonrandomly substituted, highly branched molecule is advanced. This structure contains predominantly two types of benzene rings, i.e., a relatively small number of highly substituted rings and a considerably larger number of monosubstituted benzenes existing in the form of pendant benzyl groups.

Metal-Containing Initiator Systems. XXX. Selective Initiation of Polymerization with Reduced Nickel/Organic Halides:Cationic Polymerization of Styrene and Isobutyl Vinyl Ether

“…The condensation of benzyl chloride occurred on heating at 70°C in the presence of the reduced nickel, and polybenzyl was obtained at high yield. Ir spectrum of the ethanol-insoluble fraction of this polymer ( Figure 2) was found to be almost the same as that of the polybenzyl prepared by Haas, et al, by employing benzyl chloride and iron oxide, and it was assumed that the polybenzyl contains the following structure formed by the repeated Friedel-Crafts reaction, as reported by Haas, et al 14 Nickel carbonyl when it was used in the place of the reduced nickel, produced a similar result.…”

Poly(Phenylene Methylene): A Multifunctional Material for Thermally Stable, Hydrophobic, Fluorescent, Corrosion-Protective Coatings

“…Already freshly polished AA2024 surfaces contain hydroxyl groups (evident from the symmetric and asymmetric Al-OH bending vibrations of boehmite detected in infrared spectra) [34]. Surface hydroxyl groups are commonly converted with trialkoxysilanes [23,24], RSi(OR') 3 , in presence of some water which can also stem from ambient humidity. The trialkoxysilanes can react both with surface hydroxyl groups and water, thus forming a thin and highly crosslinked surface-bound polysiloxane layer under release of the alcohol HOR'.…”

“…Therefore, PPM is structurally located between polyethylene and polyphenylene. Usually, the PPM products synthesized so far contain a mixture of ortho-, meta-and para-substituted phenylene units, with the latter reported to be dominant [1][2][3]. Interestingly, PPM unexpectedly exhibits photoluminescence, although the phenylene rings are not conjugated as in common fluorescent organic polymers [4].…”

Polybenzyls

“…[1][2][3] During the past three decades a more systemstic approach has been taken to both the synthesis and characterization of polybenzyls. The resulting polybenzyls had relatively low molecular weight (2000-3000) and varied in appearance, color, texture, solubility and melting point.…”

“…(2) The self-polycondensation of benzyl chloride and its derivatives in the presence of a suitable catalyst is undoubtedly an electrophilic aromatic substitution process. However, the incorporation of anthracene into the backbone of these polybenzyls can improve markedly their melting point and solubility.…”