Phototunable Cloud Point Temperatures Stemming from Cyclic Topology: Synthesis and Thermal Phase Transition Behavior of Cyclic Poly(N-acryloylsarcosine methyl ester),Macromolecular Rapid Communications

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Phototunable Cloud Point Temperatures Stemming from Cyclic Topology: Synthesis and Thermal Phase Transition Behavior of Cyclic Poly(N-acryloylsarcosine methyl ester)
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2021-05-08 , DOI: 10.1002/marc.202100136
Zhigang Wu ₁ , Hualong Zhang ₁ , Chao Liu ₁ , Chunyan Hong ₂

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Cyclic polymers possess distinct properties compared with their linear counterparts, such as smaller hydrodynamic volume, lower viscosity, and higher glass-transition temperature, etc. To explore the impact of the cyclic topology on the thermo-induced phase transition behavior of poly(N-acryloylsarcosine methyl ester) (PNASME), the anthracene-terminated telechelic PNASMEs are synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization of monomer NASME using a bifunctional chain transfer agent (CTA) with two anthryl groups. Subsequently, cyclic PNASMEs are prepared via UV-induced cyclization under 365 nm UV. There are considerable increases (up to 50 °C) for the cloud point temperatures (T_cps) of cyclic PNASMEs compared with the linear counterparts. In view of the increment, the T_cp of PNASME is tuned by varying the cyclic/linear ratio (the molar ratio between cyclic PNASME and linear PNASME in the product) with different irradiation time.

中文翻译：

源自环状拓扑的光可调浊点温度：环状聚（N-丙烯酰肌氨酸甲酯）的合成和热相变行为

环状聚合物与其线性对应物相比具有不同的性质，例如较小的流体力学体积、较低的粘度和较高的玻璃化转变温度等。探讨环状拓扑结构对聚（N -丙烯酰肌氨酸甲酯) (PNASME)，蒽封端遥爪 PNASMEs 是通过单体 NASME 的可逆加成断裂链转移 (RAFT) 聚合反应合成的，该聚合反应使用具有两个蒽基的双功能链转移剂 (CTA)。随后，在 365 nm 紫外线下通过紫外线诱导环化制备环状 PNASME。浊点温度 ( T _cps) 循环 PNASME 与线性对应物相比。鉴于增量，PNASME的T _cp通过改变环/线性比（产品中环状 PNASME 和线性 PNASME 之间的摩尔比）与不同的辐照时间来调节。

更新日期：2021-06-22

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