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Diethanol Ammonium-borate Based Polybetaine with Tunable UCST Phase Transition 被引量:1
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作者 Mei Shi xin-rui duan +2 位作者 Zhao-tie Liu Zhong-wen Liu 江金强 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2016年第6期777-784,共8页
A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quatemization reaction and polymerized to afford the target polybetaine of poly(4-vinylbenzyl methy... A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quatemization reaction and polymerized to afford the target polybetaine of poly(4-vinylbenzyl methyl-diethanol ammonium borate) (PVMAB). The chemical structures of the monomer and polymer were well demonstrated with 1H-NMR and llB-NMR spectra analysis. The thermal-sensitive experiment showed that PVMAB in water afforded gradually well- defined sigmoidal transmittance-temperature (T-t) curves along with the increasing polymer concentration. However, the phase transition temperatures at the bottom of the S-shaped curves were always below l0 ~C due to the very weak zwitterionic association of the ammonium-borate inner-salt pairs. The UCST phase transition could also be tuned by changing the ethanol content in the ethanol/water mixture. And the cytotoxicity experiment demonstrated the good biomimetic property of PVMAB. This study enriches the toolbox of polybetaines by introducing the quaternary ammonium- borate anion zwitterionic pair in the repeat units, therefore broadens the scope of synthetic polybetaines. 展开更多
关键词 BORATE Diethanol ammonium Polybetaine Thermal-sensitivity UCST.
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