Extremely tough block polymer-based thermoplastic elastomers with strongly associated but dynamically responsive noncovalent cross-links
Extremely tough block polymer-based thermoplastic elastomers with strongly associated but dynamically responsive noncovalent cross-links
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DOI：
10.1016/j.polymer.2021.123419
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发表时间：
2021-02-02
期刊：
影响因子：
4.6
通讯作者：
Hashimoto, Sadaharu
中科院分区：
文献类型：
--
作者：
Kajita, Takato;Tanaka, Haruka;Hashimoto, Sadaharu
为了开发具有优异机械性能和加工性能的弹性体，近年来人们对具有动态非共价交联的嵌段共聚物基热塑性弹性体（TPE）进行了积极的研究。此前对此类基于嵌段共聚物的 TPE 的大多数研究都集中在将氢键交联纳入玻璃化转变温度低于室温的嵌段中。然而，氢键合 TPE 与其他非共价键合 TPE 的机械性能之间的差异几乎没有被讨论过。这项工作使用工业生产的聚苯乙烯-b-聚异戊二烯-b-聚苯乙烯（SIS）三嵌段共聚物合成氢键（hSIS）和离子功能化热塑性弹性体（iSIS）并比较它们的机械性能。 iSIS 比 hSIS 强硬得多；值得注意的是，iSIS 表现出 480 MJ m(-3) 的优异韧性，因为 iSIS 中的离子多重态起到了更强关联但可逆的交联作用。由于该弹性体可以工业规模生产，因此它们具有成为下一代弹性体材料的巨大市场潜力。
To develop elastomers with excellent mechanical properties and processability, block copolymer-based thermoplastic elastomers (TPEs) with dynamic noncovalent cross-links have been actively studied in recent years. Most previous studies on such block copolymer-based TPEs have focused on incorporation of hydrogen-bonded cross-links into the block with a glass transition temperature lower than room temperature; however, the difference between the mechanical properties of hydrogen-bonded TPEs and those of other noncovalent-bonded TPEs has been hardly discussed. This work uses the polystyrene-b-polyisoprene-b-polystyrene (SIS) triblock copolymer produced in industry to synthesize hydrogen-bonded (hSIS) and ionically functionalized thermoplastic elastomers (iSIS) and compares their mechanical properties. iSIS is much tougher than hSIS; remarkably, iSIS exhibits an excellent toughness of 480 MJ m(-3), because the ionic multiplets in iSIS serve as much more strongly associated but reversible cross-links. Since the elastomers can be produced at industry scale, they have great market potential for becoming next-generation elastomeric materials.