Various copolymers incorporated with β-substituted acrylates, such as alkyl crotonates (e.g., methyl crotonate (MC), ethyl crotonate (EC), isopropyl crotonate (iPC), and n-butyl crotonate (nBC)) and methyl cinnamate (MCin), were synthesized by group-transfer polymerization (GTP) using a silicon-based Lewis acid catalyst. In addition to β-substituted acrylates, α-substituted acrylates (e.g., methyl methacrylate (MMA) and n-butyl methacrylate (nBMA)) were examined as comonomers. Proton nuclear magnetic resonance (¹H NMR) spectroscopy and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) characterizations of the obtained copolymers revealed that each monomer component was incorporated sufficiently. The thermal stabilities of the resulting copolymers were investigated by dynamic mechanical analysis (DMA), indicating that the glass-transition temperature (T_g) of the copolymers can be widely varied over a relatively high-temperature range by selecting the optimal comonomer. More specifically, the T_g values of poly(MC-random-EC) (MC/EC molar ratio = 50/50), poly(MC-random-nBC) (MC/nBC molar ratio = 50/50), poly(MC-random-MCin) (MC/MCin molar ratio = 54/46), and poly(nBC-random-MCin) (nBC/MCin molar ratio = 56/44) were 173, 130, 216, and 167 °C, respectively.

各种掺有β-取代丙烯酸酯的共聚物，例如巴豆酸烷基酯（例如，巴豆酸甲酯（MC），巴豆酸乙酯（EC），巴豆酸异丙酯（iPC）和巴豆酸正丁酯（nBC））和肉桂酸甲酯（MCin），通过使用基于硅的路易斯酸催化剂的基团转移聚合（GTP）合成了这些化合物。除了β-取代的丙烯酸酯以外，还检查了α-取代的丙烯酸酯（例如，甲基丙烯酸甲酯（MMA）和甲基丙烯酸正丁酯（nBMA））作为共聚单体。质子核磁共振（¹所得共聚物的1 H NMR）光谱和基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF-MS）表征表明，每种单体组分均已充分掺入。通过动态力学分析（DMA）研究了所得共聚物的热稳定性，表明通过选择最佳的共聚单体，可以在相对较高的温度范围内使共聚物的玻璃化转变温度（T _g）广泛地变化。更具体地，Ť_克聚值（MC-随机-EC）（MC / EC摩尔比= 50/50），聚（MC-随机-nBC）（MC / NBC摩尔比= 50/50），聚（ MC-随机-MCin（MC / MCin摩尔比= 54/46）和聚（nBC-无规-MCin）（nBC / MCin摩尔比= 56/44）分别为173°C，130°C，216°C和167°C。