Self-Organizing Cyclolinear Organosilicon Polymers in Bulk and on the Surface of Water†Report as inadecuate




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1

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow 119991, Russian Federation

2

Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, 70 Profsoyuznaya str., Moscow 117393, Russian Federation

3

Institute of Physics, National Academy of Science of Ukraine, 46 Nauky av., Kiev 03028, Ukraine



We dedicate this work to the memory of Prof. Yu.K. Godovsky.





*

Author to whom correspondence should be addressed.



Abstract yclolinear organocarbosiloxane polymers with varying content and location of CH2n groups in the monomer unit were synthesized by reactions of heterofunctional polycondensation and polyaddition of difunctional organocyclosiloxanes and organocyclocarbosiloxanes. Their bulk properties were studied by differential scanning calorimetry and X-ray structural analysis. It was shown that on introduction of CH2 groups into the methylcyclohexasiloxane unit, the polymer retains the ability to self-organize with formation of a mesomorphic state in a wide temperature range, while on introduction of CH22 fragments in a cyclotetrasiloxane unit or in a bridge connecting two methylcyclotetrahexasiloxane units it does not. Comparison of the X-ray data of dihydroxy derivatives of decamethylcyclohexasiloxane and decamethyl-5-carbocyclohexasiloxane with packing of cyclolinear organosilicon polymers in bulk shows that the polymer inherits the layered type of crystalline structure typical for monomers. Langmuir films of cyclolinear polymethylcarbosiloxanes with different design of monomer units were studied as well. It was revealed that all polymers form monomolecular films at the air-water interface, excluding those having longer hydrophobic fragment than hydrophilic ones. The ability to form multilayers depends on the surroundings of Si atom in the bridge between the cycles. View Full-Text

Keywords: amphiphilic cyclolinear polymers; mesomorphic polyorganocarbosiloxanes; Langmuir films amphiphilic cyclolinear polymers; mesomorphic polyorganocarbosiloxanes; Langmuir films





Author: Nataliya N. Makarova 1, Tatyana V. Astapova 1, Alexander I. Buzin 2,* , Arkady P. Polishchuk 3, Nataliya V. Chizhova 1 and Irina M. Petrova 1

Source: http://mdpi.com/



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