Synthesis and Film Formation of Poly(phenylene sulfide) Dendrimers and Dendrons

Abstract

ABSTRACT:Poly(phenylene sulfide) dendrimers up to fourth generation were synthesized by divergent method from 1,3,5-tris(4-chloro-phenylene-1-thio)benzene. All the dendrimers are soluble in polar organic solvents at room temperature. The chemical structures at the synthesis steps were confirmed by spectroscopic method. X-Ray diffraction study revealed that all dendrimers are semi-crystalline in nature. Carboxy focal poly(phenylene sulfide) dendrons were synthesized up to second generation by divergent method from 3,5-dichlorobenzoicacid. On surface pressure-area isotherm at air-water interface, third generation poly(phenylene sulfide) dendrimer displayed hysteresis. Its occupied surface area was smaller than the calculated values as well as a case of second generation poly(phenylene sulfide) dendron. Atomic force microscopic images of their LB films presented accumulation and aggregation of molecular layers. On the other hand, adsorption films of dendrimer and dendron were fundamentally monolayer. Molecular arrangements in the LB and adsorption films and the driving forces of the film formation were discussed.

Preparation of siloxy focal dendron-protected TiO2 nanoparticles and their photocatalysis

“…Generation 1-3 (G1-G3) siloxy focal C6-PAMAM dendrons with amine terminals were synthesized from 3-aminopropyl triethoxysilane by repeating two steps of Michael addition and amidation, as described elsewhere [32]. On a Michael addition reaction, methylacrylate in methanol was added dropwise into a methanol solution of 3-aminopropyl triethoxysilane or full-generation dendron under nitrogen atmosphere.…”

Adsorption behaviors of poly(amido amine) dendrimers with an azacrown core and long alkyl chain spacers on solid substrates

“…Aza-C6-PAMAM dendrimers were synthesized as previously reported [17]. The generations of the dendrimers were 1.5 to 3 (G1.5-3, half generation is ester-terminated and full generation is amine-terminated).…”

“…From these viewpoints, the synthesis and characterization have been carried out for a series of functional PAMAMtype dendrimers (aza-C6-PAMAM dendrimers, see Fig. 1) that have an azacrown core and long alkyl chain (hexyl) spacers [17]. While the ester-terminated aza-C6-PAMAM dendrimers formed homogeneous Langmuir films with face- on configuration at the air-water interface, the dendrimers aggregated with silver nanoparticles by the aid of functional azacrown moiety on the aqueous suspension of silver nanoparticle as subphase [18].…”

Dendronization: A Useful Synthetic Strategy to Prepare Multifunctional Materials

“…Thiol dendron was fabricated into a uniform self-assembled monolayer at room temperature. However, multilayer aggregation or accumulation in the normal direction to the surface has never been reported, different from poly(phenylene sulfide) dendron [103]. This may result from the weaker π-π stacking interaction between benzyl groups in poly(benzylether) dendrons [104] because of longer distance between them.…”

“…This may result from the weaker π-π stacking interaction between benzyl groups in poly(benzylether) dendrons [104] because of longer distance between them. The aggregation can be formed by the face to-face interaction of dendrons within two dimensional plane and the repeating accumulation by the π-π stacking interaction between phenylene terminal groups and the hydrophilic interaction between focal points, forming large domains [103].…”