Relaxation spectrum of poly(styrene-b-isoprene-b-styrene) triblock copolymer

IF 2.4 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal Pub Date : 2024-05-14 DOI:10.1007/s13726-024-01328-3

Hengyu Luo, Zihao Shang, Hui Han, Haiqing Hu

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Abstract

A relatively complete continuous relaxation spectrum H(τ) of poly(styrene-b-isoprene-b-styrene) (SIS) two-phase system was divided into five regions based on the variation of H(τ) strength, which corresponded to: (1) glass transition of PI phase, (2) high elastic state of PI phase, (3) glass transition of PS phase, (4) high elastic state of PS phase, and (5) viscous flow state of the entire SIS molecular chain. Five regions only appeared in SIS1105, because the molecular of SIS1105 experienced glass transition of PI block, PS block, and viscous flow of the whole molecular chain. The stress relaxation of SIS was influenced by the S/I ratios, because the PS microdomains ultimately determined the relaxation characteristics. The stress relaxation of SIS system was also closely related to the viscous flow transition temperature (T_f). When the S/I ratio was low (15/85), forced stress relaxation occurred; when the S/I ratio was high (29/71 and 45/55), the SIS system did not show stress relaxation below the T_f. When the temperature was higher than the T_f, the S/I ratio did not affect the stress relaxation. The relaxation information obtained from the Cole–Cole diagram further verified the analysis of the continuous relaxation spectrum H(τ) and stress relaxation.

Graphical abstract

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聚（苯乙烯-b-异戊二烯-b-苯乙烯）三嵌段共聚物的松弛光谱

根据H(τ)强度的变化，将聚(苯乙烯-异戊二烯-苯乙烯)(SIS)两相体系相对完整的连续弛豫谱H(τ)分为五个区域，分别对应于(1) PI 相的玻璃化转变；(2) PI 相的高弹性状态；(3) PS 相的玻璃化转变；(4) PS 相的高弹性状态；(5) 整个 SIS 分子链的粘性流动状态。仅在 SIS1105 中出现了五个区域，这是因为 SIS1105 的分子经历了 PI 块、PS 块的玻璃化转变和整个分子链的粘性流动。SIS 的应力松弛受 S/I 比的影响，因为 PS 微区最终决定了松弛特性。SIS 系统的应力松弛还与粘流转变温度（Tf）密切相关。当 S/I 比值较低时（15/85），会出现强迫应力松弛；当 S/I 比值较高时（29/71 和 45/55），SIS 系统在 Tf 以下不会出现应力松弛。当温度高于 Tf 时，S/I 比不影响应力松弛。从科尔-科尔图中获得的松弛信息进一步验证了对连续松弛谱 H(τ) 和应力松弛的分析。

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.