Citation: LÜ Hai-Yan, LIU Shou-Xin, XU Chao, TIAN Rong, WANG Li. Synthesis and Characterization of Temperature-Sensitivity P(MEO₂MA-co-OEGMA) Copolymers[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201207161 shu

Synthesis and Characterization of Temperature-Sensitivity P(MEO₂MA-co-OEGMA) Copolymers

1.
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P.R. China

Received Date: 8 May 2012
Available Online: 16 July 2012
Fund Project: 国家自然科学基金(20973106) (20973106)中央高校基本科研业务费专项资金(GK201001001) (GK201001001)(IRT1070)资助项目 (IRT1070)

Temperature-responsive P(MEO₂MA-co-OEGMA) copolymers of 2-(2-methoxyethoxy) ethyl methacrylate (MEO₂MA) and oli (ethylene glycol) methacrylate (OEGMA) were synthesized via atom transfer radical polymerization (ATRP) in ethanol using CuCl/2,2'-bipyridyl (bpy) as the catalyst system and ethyl-2-bromopropionate (EBP) as an initiator. The synthesized copolymers were characterized by proton nuclear magnetic resonance spectroscopy (1H NMR) and gel permeation chromatography (GPC). Copolymer temperature sensitivities in aqueous solution were investigated by measurements of optical transmittance and viscosity as well as laser particle size analysis. The effects of various parameters on the phase transition temperatures of aqueous copolymer solutions were examined, including OEGMA content, solution concentration, and the concentrations and species of added salts. Results showed that the copolymers demonstrated temperature sensitivity; the lowest critical solution temperature (LCST) increased both with increasing OEGMA content and decreasing solution concentration. Copolymer LCST values could also be controlled by adjusting the mole fractions of MEO₂MA and OEGMA. It was additionally observed that LCST values decreased as the salt concentration and anion valence increased. The addition of acid or base also affected the LCST of the copolymer solutions; addition of HCl decreased the LCST while addition of NaOH resulted in an increase.
- P(MEO₂MA-co-OEGMA) copolymer,
- Temperature sensitivity,
- Atom transfer radical polymerization,
- Salt effect,
- pH effect
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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Characterization of Temperature-Sensitivity P(MEO2MA-co-OEGMA) Copolymers

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Characterization of Temperature-Sensitivity P(MEO₂MA-co-OEGMA) Copolymers