Citation: GUO Yi, LIU Heng-Jiang, CHEN Jie-Qiong, SHANG Ya-Zhuo, LIU Hong-Lai. Synthesis of P(MEO₂MA-co-OEGMA) Random Copolymers and Thermally Induced Phase Transition Behaviors in Aqueous Solutions[J]. Acta Physico-Chimica Sinica, ;2015, 31(10): 1914-1923. doi: 10.3866/PKU.WHXB201508263 shu

Synthesis of P(MEO₂MA-co-OEGMA) Random Copolymers and Thermally Induced Phase Transition Behaviors in Aqueous Solutions

1.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

Received Date: 18 May 2015
Available Online: 26 August 2015
Fund Project: 国家自然科学基金(21173079, 91334203, 21476072)资助项目 (21173079, 91334203, 21476072)

Random copolymers of 2-(2-methoxyethoxy)ethyl methacrylate (MEO₂MA) and oli (ethylene glycol) methacrylate (OEGMA, M_n = 500 g·mol^-1) were synthesized by atom transfer radical polymerization (ATRP). Thermally induced aggregation of the co-polymers P(MEO₂MA-co-OEGMA) in aqueous solutions was investigated with dynamic light scattering (DLS), UV-Vis absorption, and transmission electron microscopy (TEM). In addition, the lower critical solution temperature (LCST) in aqueous solutions of P(MEO₂MA-co-OEGMA), and its change with respect to the composition of the copolymer, were obtained. The results indicate that the copolymers have an appreciably reversible thermal responsivity that can be attributed to a delicate balance between hydrogen bonds between the copolymers and water molecules and hydrophobic interactions of polymer segments. If the balance is broken, the polymers attain a new thermodynamic equilibrium by spontaneously changing the extent of aggregation. The LCST correlates linearly with the mole fraction of OEGMA units in the copolymer, and can be adjusted by changing the mole ratio of the two monomers.
- Random copolymer,
- Thermo-responsive,
- Lower critical solution temperature,
- Phase transition
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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis of P(MEO2MA-co-OEGMA) Random Copolymers and Thermally Induced Phase Transition Behaviors in Aqueous Solutions

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通讯作者: 陈斌, bchen63@163.com

Synthesis of P(MEO₂MA-co-OEGMA) Random Copolymers and Thermally Induced Phase Transition Behaviors in Aqueous Solutions