Effect of chain-penetration on ring shape for mixtures of rings and linear polymers

POLYMER

卷:218

Article

Hagita, Katsumi¹  Murashima, Takahiro² 

[1] Natl Def Acad, Dept Appl Phys, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 2398686, Japan

[2] Tohoku Univ, Dept Phys, Aoba Ku, 6-3 Aramaki Aza Aoba, Sendai, Miyagi 9808578, Japan

关键词: Coarse-grained molecular dynamics simulations;    Ring-linear blends;    Chain penetration;    Ring polymer shape;    Gauss linking number;   

DOI  :  10.1016/j.polymer.2021.123493

来源: Elsevier

【 摘 要 】

Coarse-grained molecular dynamics simulations of Kremer-Grest-type bead-spring models were performed on mixtures of ring and linear polymers to investigate the effects of chain-penetration on polymer ring shape. We found that the number of linear chains penetrating through a ring increased with ring size, while penetration was inhibited for smaller rings composed of less than 80 beads. From the eigenvalue analyses of the gyration tensor of each ring, the ring shape was characterized by asphericity and prolateness. The number of chains penetrating through a ring (n(p)) was determined from the Gauss linking numbers of all ring and linear chain pairs. The radius of gyration of the rings were dependent on the rip value, suggesting that the linear chains expanded the ring upon penetration. The obtained results provide important insights in ring-linear blends for theoretical research as well as simulations and experiments especially for rheological measurements.

【 授权许可】

Free