Thin-film behavior of poly(methyl methacrylates). 2. An FT-IR study of Langmuir-Blodgett films of isotactic PMMA

Abstract

The structure of Langmuir-Blodgett films of isotactic PMMA transferred to substrates was investigated with FT-infrared techniques. From the results it is argued that at high surface pressures, the isotactic PMMA is transferred in a crystalline-like conformation, presumably as double helices. The films built of this type of Langmuir-Blodgett layers can easily be crystallized further, in contrast with films of amorphous isotactic PMMA. Infrared techniques were also used to deduce the orientational characteristics of the crystalline structures. These were found to be strongly dependent on the molecular weight and monolayer history. Very strongly oriented, highly crystalline thin films could be prepared starting from Langmuir-Blodgett multilayers.

Studies on spin coated PANI/PMMA composite thin film: Effect of post-deposition heating

“…1. The peaks for PMMA have been reported at 1731 cm À1 for C O stretching vibrations, 1260-1000 cm À1 for C-O (ester bond) stretching vibration, 950-650 cm À1 for C-H bending and 3000-2900 cm À1 for C-H stretching [13].…”

Development of an Ultrafast Low-Energy Electron Diffraction Setup

“…The chain-to-chain distances reported in the literature are 5.0(1.0)Å and 4.8(1.9)Å, respectively, with a repeating monomer unit length of about 2.5Å in direction of the polymer backbone. In the case of isotactic PMMA, linear as well as helical arrangements are found with a somewhat smaller interchain distance of the latter of 3.7(0.8)Å [110,115,116].…”

Investigation of the structural, thermal, mechanical, and optical properties of poly(methyl methacrylate) and poly(vinylidene fluoride) blends

“…It can be noted from Figure 5 that T c decreased from 144. 28 C for pure PVDF to 136.23 C for the 50/ 50 blend composition. The behavior of T g , T m , and T c for PMMA/PVDF blends of different compositions is shown graphically in Figure 6.…”