Abstract
Multiblock copolymers containing linear polydimethylsiloxane or polymethyltrifluoropropylsiloxane and ladder-like polyphenylsiloxane were synthesized in a one-step pathway. The functional homopolymer blocks and final multiblock copolymers were characterized using solution and solid-state multinuclear 1H, 13C, 19F, and 29Si NMR spectroscopy. It was shown that the ladder-like block contains silanol units, which influence the adhesion properties of multiblock copolymers and morphology of their casted films. The adhesion to metals and mechanical properties of multiblock copolymers were tested. The SEM study of casted films of multiblock copolymers shows the variety of formed morphologies, including long-strip-like or globular.
Highlights
The development of new coatings for advanced applications requires materials with the internal capability for self-organization on a micro-nano level
This paper focuses on synthesis of PDMS/ladder-like and its trifluoropropyl substituted analogues block-copolymers
The pathway of synthesis of block-copolymers IV and V is presented on Scheme 1
Summary
The development of new coatings for advanced applications requires materials with the internal capability for self-organization on a micro-nano level. A combination of blocks with different structure, length, and chemical compositions, with a variation of their sequence and consistency, allows to create materials with enormous versatility for application [1]. Because of the dual nature of their backbones (organic/inorganic), silicone containing blocks are widely used in the preparation of block-copolymers [2]. This topic is directly related to the interesting combination of properties offered by these fragments, which include extremely high backbone flexibility, good thermal and oxidative stability, high gas permeability, excellent dielectric properties, and physiological inertness or biocompatibility [3]. Polydimethylsiloxanes (PDMS) and their trifluoropropyl substituted analogues display very low surface tension values [4], providing an opportunity for the development of materials with precisely structured elements in two and three dimensions on length scales from many microns down to several nanometers [5]
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