Structural investigation of phthalocyaninatopoly(siloxane) Langmuir–Blodgett films by X‐ray diffraction

Abstract

The structure of Langmuir-Blodgett (LB) films of a rigid rod phthalocyanatopoly(si1oxane) substituted by alkoxy side chains has been investigated by X-ray diffraction using thin silicon wafers as a substrate for deposition. Freshly prepared samples do not possess a truely periodic multilayer structure.The polymer backbones lie flat in the substrate plane and are preferentially oriented along the dipping direction. Each macromolecule is surrounded by parallel adjacent rods and a firstneighbor distance is found in every direction. This structure recalls the local organization of a nematic liquid crystal. Short annealing of the as-deposited films leads to a highly oriented hexagonally dense packing as of cylinders. The alignment of the backbones along the dipping direction becomes nearly perfect and the most densely packed plane is oriented in the substrate plane. A helical order within the macromolecules of the annealed samples is suspected from extra reflections appearing in the diffraction pattern.

Nanocomposites of Hairy‐Rod Macromolecules: Concepts, Constructs, and Materials

“…[13][14][15][16][17][18][19][20] The synthesis of these interesting polymers was substantially improved by Caseri and Sauer; [14,16,17] and according to their work large degrees of polymerization can be reached. The close cofacial packing of the monomer units along the polysiloxane chain which is sketched in Figure 2 leads to a strong interaction between repeat units and results in a Si-O-Si bond angle of 1808.…”

“…PcPS substituted with methoxy and alkoxy side groups at the perimeter of the metallomacrocycle have been extensively investigated 13–20. The synthesis of these interesting polymers was substantially improved by Caseri and Sauer;14,16,17 and according to their work large degrees of polymerization can be reached.…”

Ultrathin layers of phosphorylated cellulose derivatives on aluminium surfaces

“…The cause for the varying intensity at 1166 cm -1 is probably a preferential orientation parallel to the surface. [5,6] The FT-IR spectrum of 2 strongly differs in the vibration at 1 056 cm -1 . The high intensity with 90 8 polarised radiation and the low intensity with 0 8 polarised radiation are probably due to a preferential orientation parallel to the surface as well.…”

“…These hairy-rod cellulose polymers are able to form mono-and multilayers on hydrophobic surfaces. [5][6][7][8] It was possible to obtain regenerated cellulose with high biocompatibility by hydrolysing cellulose silylesters. [5] In cooperation with the group of Wegner, [9] we first synthesised hairy-rod molecules for LB-layers on the basis of butyl cellulose substituted with phosphoric acid groups but having a low degree (0.2) of substitution only.…”

Ultrathin layers of phosphorylated cellulose derivatives on aluminium surfaces

“…These hairy-rod cellulose polymers are able to form mono-and multilayers on hydrophobic surfaces. [5][6][7][8] It was possible to obtain regenerated cellulose with high biocompatibility by hydrolysing cellulose silylesters. [5] In cooperation with the group of Wegner, [9] we first synthesised hairy-rod molecules for LB-layers on the basis of butyl cellulose substituted with phosphoric acid groups but having a low degree (0.2) of substitution only.…”