Preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/boric acid/poly(N-methyl benzamide)-b-poly(propylene oxide) block copolymer nanocomposites – no weight loss behavior of the block copolymer in the nanocomposites even after calcination at 800 °C
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Abstract
Fluoroalkyl end-capped vinyltirimethoxysilane oligomeric silica/boric acid nanocomposites [RF-(VM-SiO2) n -RF/B(OH)3] were prepared by the composite reaction of the corresponding fluorinated oligomer [RF-(CH2CHSi(OMe)3) n -RF, n = 2, 3; RF = CF(CF3)OC3F7: RF-(VM) n -RF] with boric acid. The nanocomposites thus obtained were tried to interact with the thermoplastic elastomers such as poly(N-methyl benzamide)-b-poly(propylene oxide) block copolymers [(MAB) m-m -b-PPO32: m = 5, 6, 7, and 8] and poly(ethersulfone)-b-poly(tetrahydrofuran)-b-poly(ethersulfone) triblock copolymer [PES-b-PTHF-b-PES] under alkaline conditions to afford the corresponding RF-(VM-SiO2) n -RF/B(OH)3/thermoplastic elastomers nanocomposites. We also tried to prepare the corresponding RF-(VM-SiO2) n -RF/thermoplastic elastomers nanocomposites under similar conditions, for comparison. In these thermoplastic elastomers, PES-b-PTHF-b-PES triblock copolymers cannot interact with the RF-(VM-SiO2) n -RF/B(OH)3 nanocomposites or the RF-(VM-SiO2) n -RF oligomeric nanoparticles to supply the expected nanocomposite products. However, it was demonstrated that the (MAB) m-m -b-PPO32 block copolymers can react with the RF-(VM-SiO2) n -RF/B(OH)3 nanocomposites under alkaline conditions to afford the RF-(VM-SiO2) n -RF/B(OH)3/(MAB) m-m -b-PPO32 nanocomposites, providing no weight loss characteristic corresponding to the contents of the block copolymers in the composites even after calcination at 800 °C, although these expected nanocomposites were isolated without purification process. The RF-(VM-SiO2) n -RF/(MAB) 5-5 -b-PPO32 nanocomposites, which were isolated under similar process, were also able to supply no weight loss in proportion to the content of the copolymer in the nanocomposites even after calcination at 800 °C.
Graphical abstract
Keywords
Fluorinated oligomer Silica Boric acid Nanocomposite Thermoplastic elastomer No weight lossNotes
Acknowledgements
This work was financially supported by the Grant Co-funded by 3NUNT (National Universities of Northern Tohoku), Japan.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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