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Rapid Synthesis of Elastomers and Thermosets with Tunable Thermomechanical Properties
ACS Macro Letters ( IF 5.8 ) Pub Date : 2020-05-26 , DOI: 10.1021/acsmacrolett.0c00233
Leon M. Dean , Qiong Wu , Omar Alshangiti , Jeffrey S. Moore , Nancy R. Sottos

Rapid, solvent-free synthesis of poly(1,4-butadiene) in ambient conditions is demonstrated by frontal ring-opening metathesis polymerization (FROMP) of 1,5-cyclooctadiene (COD). Furthermore, cross-linked copolymers with a wide range of tunable properties are readily prepared by FROMP of mixtures of COD and dicyclopentadiene (DCPD). Specifically, glass transition temperature and tensile modulus are varied from −90 to 114 °C and 3.1 MPa to 1.9 GPa, respectively, by controlling the comonomer ratio. Copolymers with subambient glass transition temperature exhibit robust elastomeric behavior, with the ability to repeatedly recover from large elastic deformations. As a demonstration of the capability of this manufacturing strategy, gradient materials are fabricated in less than a minute with spatially controlled properties for multistage shape memory actuation. This simple yet powerful manufacturing strategy enables rapid synthesis of copolymers ranging from elastomers to thermosets with precise control over thermomechanical properties.

中文翻译:

具有可调热机械性能的弹性体和热固性材料的快速合成

1,5-环辛二烯 (COD) 的正面开环复分解聚合 (FROMP) 证明了在环境条件下快速、无溶剂地合成聚 (1,4-丁二烯)。此外,通过 COD 和双环戊二烯 (DCPD) 的混合物的 FROMP 很容易制备具有广泛可调特性的交联共聚物。具体而言,通过控制共聚单体的比例,玻璃化转变温度和拉伸模量分别在 -90 至 114 °C 和 3.1 MPa 至 1.9 GPa 之间变化。具有低于环境玻璃化转变温度的共聚物表现出稳健的弹性行为,能够从大的弹性变形中反复恢复。作为这种制造战略能力的证明,梯度材料可在不到一分钟的时间内制造出来,具有空间受控特性,可用于多级形状记忆驱动。这种简单而强大的制造策略能够快速合成从弹性体到热固性塑料的共聚物,并精确控制热机械性能。
更新日期:2020-05-26
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