Di-block copolymer stabilized methyl methacrylate based polyHIPEs: Influence of hydrophilic and hydrophobic co-monomers on morphology, wettability and thermal properties
| Autor: | Yongkang Wang, Anhou Xu, Jian Chen, Zhang Yabin, Umair Azhar, Chuanyong Zong, Huateng Li, Bing Geng, Rimsha Yaqub, Shuxiang Zhang, Ghulam Abbas |
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| Rok vydání: | 2020 |
| Předmět: |
Acrylate
General Chemical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Methacrylate 01 natural sciences 0104 chemical sciences lcsh:Chemistry Contact angle chemistry.chemical_compound Monomer lcsh:QD1-999 chemistry Chemical engineering Amphiphile Emulsion Copolymer Methyl methacrylate 0210 nano-technology |
| Zdroj: | Arabian Journal of Chemistry, Vol 13, Iss 2, Pp 3801-3816 (2020) |
| ISSN: | 1878-5352 |
| Popis: | Due to intermediate hydrophobicity of methyl methacrylate (MMA) monomer in water, it is difficult to prepare its stable water in oil high internal phase emulsion (HIPE). Moreover, the addition of fully hydrophilic co-monomer such as 2-hydroxyethyl methacrylate (HEMA) in MMA monomer makes it further troublesome to stabilize these emulsions. This paper addresses the preparation of such type of difficult to prepare emulsions via addition of an amphiphilic fluorinated di-block copolymer (FDB), poly(2-dimethylamino)ethylmethacrylate-b-poly(trifluoroethyl methacrylate) (PDMAEMA-b-PTFEMA) as stabilizer. Interestingly, HEMA and/or HFBA (hexa fluorobutyl acrylate) as co-monomers were successfully added to impart some special properties such as thermodynamic stability, desired amphiphilicity to the final polyHIPEs. Fluorinated blocks in FDB anchored well at oil/water interface of HIPE, offering enough hydrophobicity to the comparatively hydrophilic monomers and in turn providing resistance against coalescence. MMA polyHIPEs were found to be fully hydrophobic just by replacing HEMA co-monomer with HFBA. Due to superb inherent hydrophobic nature of fluorine atoms, MMA-HFBA polyHIPEs showed remarkable water contact angle of 139°. Furthermore, the addition of fluorinated co-monomer in MMA based HIPEs significantly improved thermal stabilities of these materials with improvement in degradation temperature from 305 °C to 360 °C. Keywords: MMA, Porous polymers, Hydrophilic polyHIPE, Hydrophobic polyHIPE, Fluorinated di-block copolymer, RAFT |
| Databáze: | OpenAIRE |
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