Unusual Memory Effect of Crystallization Raised by 4-Phenyl-1-butene and 4-Anthryl-1-butene Comonomers in 1-Butene-Based Copolymers

• DOI: 10.1021/acs.macromol.4c00721
• Publication Date: 2024-06-10T19:31:29Z
• Authors: Jiazheng Shen; Fei Yang; Yilong Liao; Zhe Ma; Yuesheng Li
• Keywords: 1-Butene; 2-Butene; Butene

A strong memory effect has been identified in copolymers even above the equilibrium melting temperature, which accelerates subsequent recrystallization process. In this study, two series of novel 1-butene-based random were synthesized from comonomers: 4-phenyl-1-butene (PhB) and 4-anthryl-1-butene (AnB). PhB AnB introduced phenyl anthryl groups, respectively, into poly(1-butene) main chain. The occurrence evolution systematically explored presence these designed counits via differential scanning calorimetry. temperature occurred both copolymers, while their critical compositions incorporation varied largely. was triggered with incorporated up to 5.33 mol % for a fixed annealing period 10 min. However, only 0.6 sterically hindered large induced effect. plot crystallization as function melt (Tmelt) showed counterintuitive bell-shaped trend copolymers. strength increased on extending holding duration, contrary customary decaying behavior. Such developed clearly explains origin observed inversion rate over broad range.