Slow structural rearrangement of a side-chain phthalocyanine methacrylate polymer at the air-water interface

Abstract

A polymethacrylate with dodecoxy-substituted phthalocyanine units in the side chains has been used to form Langmuir-Blodgett monolayers at the air-water interface. The monolayers are highly crystalline. They expand slowly even when a constant surface pressure is applied. The structural change coupled with this process has been studied by electron microscopy, electron diffraction, and ellipsometry. It is proposed that the expansion is the result of a change in conformation of the peripheral alkoxy chains on the phthalocyanine rings. The polymer can be deposited on various substrates with Y-type transfer if it is mixed with arachidic acid. The resulting multilayers have been characterized by UV/vis and FT-IR spectroscopies and ellipsometry. No flow-induced orientation was observed during the transfer process.

Arrangement of tris(phthalocyaninato) gadolinium triple-decker complexes with multi-octyloxy groups on water surface

“…This reveals that the SA molecules add no influence on the orientation of the phthalocyanine ring of triple-decker molecules in the mixed monolayers. This conclusion is in line with that deduced from the studying of mixed monolayers of SA with non-amphiphilic materials like polymethacrylate with dodecyloxy-substituted phthalocyanine in the side chains [44] or bis(phthalocyaninato) ytterbium compound [45].…”

A novel approach to synthesize polymers for potential photodynamic therapy: from benzenedinitrile to phthalocyanine

“…Polymeric Pcs, either of main-chain or side-chain type, which offer a unique combination of good properties of polymers and Pcs, have been paid much attention recently. 23 Among them, the side-chain polymeric Pcs/MtPcs were mainly prepared via polymerization of Pc/MtPc-containing monomers [24][25][26] or "graing to" reactions. 23,27,28 However, the synthesis of Pc/MtPc containing monomers or asymmetric Pcs is difficult due to the relatively low yield.…”

Geometric Frustration and Long-Range Ordering Induced by Surface Pressure Oscillation in a Langmuir–Blodgett Monolayer of Magnetic Soft Spheres

“…Polymers have been known slowly to undergo rearrangement at air–aqueous interfaces. − With this in mind, we reason that one element influencing the structural rearrangement and dissociation dynamics of aggregates is the time- and surface pressure-dependent interpenetration of the polymer chains of the surfactant molecules on different particles, , as also indicated by Kim et al Thus, the diminishing of the hysteresis loop observed upon pressure cycling and the stiffening of the 2-D gel upon holding at constant pressure can also be a result of steric repulsion operating as the film is compressed into the 2-D gel and solid phases. We hypothesize that the polymer chains tend to fold and not interpenetrate as the particles initially come into contact, then interpenetrate slowly and dissociate from the interpenetrated state slowly.…”