Preparation and Characterization of Monolayer and Multilayer Langmuir−Blodgett Films of a Series of 6-O-Alkylcelluloses

Abstract

Monolayer and multilayer Langmuir-Blodgett (LB) films of 6-O-alkylcelluloses with various chain lengths were prepared and studied. The surface pressure (pi)-area (A) isotherms of 6-O-alkylcelluloses exhibited characteristic behaviors depending on the length of the alkyl chain and temperature. 6-O-Stearylcellulose on the subphase formed a homogeneous monolayer at 10 mN m(-1). By transfer ratio, FT-IR, and contact angle measurements, it was proved that the monolayer of 6-O-stearylcellulose on the water surface was transferred successfully onto a substrate by a vertical dipping method to form a Z-type LB film. The transmission and reflection absorption IR spectrum indicated that the hydrocarbon chains had all-trans rotamers and were oriented nearly perpendicular to the surface in the film. AFM section analysis revealed that the thickness per layer was calculated to be 2.35 nm. These results suggested that the hydrocarbon chains were inclined at an angle of about 25.3 degrees to have high packing density in the alkyl region.

Syntheses of 6-O-ethyl/methyl-celluloses via ring-opening copolymerization of 3-O-benzyl-6-O-ethyl/methyl-α-d-glucopyranose 1,2,4-orthopivalates and their structure–property relationships

“…Ring-opening copolymerizations of 3-O-benzyl-6-O-ethyl-a-D-glucopyranose 1,2,4-orthopivalate (5) and 3-O-benzyl-6-O-methyl-a-Dglucopyranose 1,2,4-orthopivalate (6) Compounds 5 and 6 were prepared from 3-O-benzyla-D-glucopyranose 1,2,4-orthopivalate by alkylation under basic conditions (Ifuku et al 2005;Kamitakahara et al 2009). Ring-opening copolymerizations of compounds 5 and 6 were carried out with boron trifluoride diethylether complex as an initiator.…”

“…Cooling rate: 3.0 K/min Monomers for ring-opening copolymerization 3-O-Benzyl-6-O-ethyl-a-D-glucopyranose 1,2,4-orthopivalate (5). Compound 5 was prepared according to our previous work (Ifuku et al 2005). 3-O-Benzyl-6-O-methyl-a-D-glucopyranose 1,2,4-orthopivalate (6).…”

“…3-O-Benzyl-6-O-methyl-a-D-glucopyranose 1,2,4-orthopivalate (6). Compound 6 was prepared according to our previous paper (Ifuku et al 2005).…”

Preparation of the new derivatives of cellulose and oligomeric species of cellulose containing magneson II chromophore

“…With this procedure, new cellulosic derivatives containing various alkylated groups can be conveniently prepared 18–20. On the other hand, the obtained compounds, like some other natural and biocompatible compounds, have potential applications as the Langmuir–Blodgett films in the different fields and have been appreciated 21–27. The Langmuir–Blodgett films in comparison with the common films have some advantages such as high degree of molecular orientation, precise control of film thickness at the molecular level, control of layer architecture, high optical stability for optical processes, and building up noncentrosymmetric structures for second‐order nonlinear optics 28–30.…”

“…[18][19][20] On the other hand, the obtained compounds, like some other natural and biocompatible compounds, have potential applications as the Langmuir-Blodgett films in the different fields and have been appreciated. [21][22][23][24][25][26][27] The Langmuir-Blodgett films in comparison with the common films have some advantages such as high degree of molecular orientation, precise control of film thickness at the molecular level, control of layer architecture, high optical stability for optical processes, and building up noncentrosymmetric structures for second-order nonlinear optics. [28][29][30] Based on hairy-rod concept, several types of macromolecules namely rigid-rodlike polymers, could decorate with flexible alkyl side chains, has been used to construct stable and homogeneous ultrathin films by the Langmuir-Blodgett technique.…”