Linear and Cyclolinear Polysiloxanes in the Bulk and Thin Films on Liquid and Solid Substrate Surfaces

Squeezing Out Interfacial Solvation: The Role of Hydrogen-Bonding in the Structural and Orientational Freedom of Molecular Self-Assembly

“…29,33−35 Previous work has shown that PDMS chains tend to align with their long-axis parallel to the air−aqueous interface when deposited in the dilute regime. 31 This results in a loosely packed configuration of molecules with no net orientation (region I of Figure 1). Upon further compression (region II), the increased packing of molecules into a two-dimensional (2D) area was observed as an exponential increase in surface pressure versus area.…”

“…13 Second, PDMS-based Langmuir films in the low surface concentration region are much more homogeneous than the ones at the high surface concentration region. 31,34,36 This characteristic may be beneficial for preparing ODMS-MIM + constructed low-dimensional materials (e.g., two-dimensional (2D) polymer films) by using methods such as the Langmuir−Blodgett method. Of note, the polymer organization, tightly correlating with the phase of Langmuir films, may have a decisive effect on the intra-and interlayer interactions, which is critical for 2D polymer film functions.…”

Star‐shaped siloxane polymers with various cyclic cores: Synthesis and properties

“…The points on Curve 1 in Figure correspond to the inflections of surface pressure isotherm. The shape of surface pressure isotherms obtained upon compression of Langmuir films of compounds D 5 ‐PDMS (P 2 ) – D 12 ‐PDMS (P 6 ) has a close resemblance to the ones for PDMSs from A to D region and is completely similar to D 4 ‐PDMS ( P 1 ) . The surface of Langmuir films of star‐shaped copolymers was visualized by Brewster angle microscopy directly during compression.…”

“…There are two (D, F) or three (D–F) points on inflections of the surface pressure isotherm upon further compression of Langmuir films of star‐shaped copolymers D 5 ‐PDMS ( P 2 ) – D 12 ‐PDMS ( P 6 ) . For linear and nonfunctional PDMS, there are no inflections after Point D on the surface pressure isotherm . The CD region of the surface pressure isotherm is attributed to a densification of horizontal folding layers without conformation changes of siloxane chains .…”

“…The DF region of the surface pressure isotherm is common for PDMS oligomers functionalized with hydrophilic (hydroxy, carboxy, amino, epoxy) groups . For PDMS with hydrophilic end groups, the Inflections E and F could be assigned to orientational changes of molecules due to binding of the end groups to the subphase.…”