Toughening CO 2 -Derived Copolymer Elastomers Through Ionomer Networking
Toughening CO 2 -Derived Copolymer Elastomers Through Ionomer Networking
复制标题
通过离聚物网络增韧 CO 2 衍生的共聚物弹性体
DOI：
10.1002/adma.202302825
复制
发表时间：
2023
影响因子：
29.4
通讯作者：
Poon K
中科院分区：
文献类型：
--
作者：
Poon K
利用二氧化碳 (CO2) 通过 CO2 和环氧化物的开环共聚 (ROCOP) 来制造聚碳酸酯，可以稳定和回收 CO2，并减少聚合物制造中的污染。催化领域的最新发展提供了具有明确结构的聚碳酸酯，并允许与生物质衍生的单体进行共聚；然而，由此产生的材料特性尚未得到充分研究。本文描述了新型二氧化碳衍生热塑性弹性体 (TPE) 以及一种无需重新设计材料即可增强拉伸机械强度和杨氏模量的通用方法。这些 TPE 将高玻璃化转变温度 (Tg) 无定形嵌段（包含 CO2 衍生的聚碳酸酯）（A 嵌段）与来自蓖麻油的低 Tg 聚（ε-十内酯）（B 嵌段）结合在 ABA 结构中。聚碳酸酯嵌段选择性地用金属羧酸盐官能化，其中金属为 Na(I)、Mg(II)、Ca(II)、Zn(II) 和 Al(III)。这种无色聚合物的金属含量低于 1 wt%，具有可调节的热 (Tg) 和机械（断裂伸长率、弹性、抗蠕变性）性能。与起始嵌段聚合物相比，最好的弹性体在不影响弹性恢复的情况下，杨氏模量高出 50 倍，拉伸强度高出 21 倍。它们具有广泛的工作温度（−20 至 200°C）、高抗蠕变性，并且仍然可回收。未来，这些材料可能会取代大批量的石化弹性体，并应用于医药、机器人和电子等高增长领域。
Utilizing carbon dioxide (CO2) to make polycarbonates through the ring‐opening copolymerization (ROCOP) of CO2and epoxides valorizes and recycles CO2and reduces pollution in polymer manufacturing. Recent developments in catalysis provide access to polycarbonates with well‐defined structures and allow for copolymerization with biomass‐derived monomers; however, the resulting material properties are underinvestigated. Here, new types of CO2‐derived thermoplastic elastomers (TPEs) are described together with a generally applicable method to augment tensile mechanical strength and Young's modulus without requiring material re‐design. These TPEs combine high glass transition temperature (Tg) amorphous blocks comprising CO2‐derived poly(carbonates) (A‐block), with lowTgpoly(ε‐decalactone), from castor oil, (B‐block) in ABA structures. The poly(carbonate) blocks are selectively functionalized with metal‐carboxylates where the metals are Na(I), Mg(II), Ca(II), Zn(II) and Al(III). The colorless polymers, featuring <1 wt% metal, show tunable thermal (Tg), and mechanical (elongation at break, elasticity, creep‐resistance) properties. The best elastomers show >50‐fold higher Young's modulus and 21‐times greater tensile strength, without compromise to elastic recovery, compared with the starting block polymers. They have wide operating temperatures (−20 to 200 °C), high creep‐resistance and yet remain recyclable. In the future, these materials may substitute high‐volume petrochemical elastomers and be utilized in high‐growth fields like medicine, robotics, and electronics.