Rapid Synthesis of Elastomers and Thermosets with Tunable Thermomechanical Properties
Rapid Synthesis of Elastomers and Thermosets with Tunable Thermomechanical Properties
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DOI：
10.1021/acsmacrolett.0c00233
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发表时间：
2020-06-16
影响因子：
7.015
通讯作者：
Sottos, Nancy R.
中科院分区：
文献类型：
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作者：
Dean, Leon M.;Wu, Qiong;Sottos, Nancy R.
通过1，5-环辛二烯（COD）的正面开环易位聚合（FROMP），在室温条件下快速无溶剂合成聚1，4-丁二烯。此外，通过COD和双环戊二烯（DCPD）的混合物的FROMP，容易地制备具有宽范围的可调性质的交联共聚物。具体地，通过控制共聚单体比率，玻璃化转变温度和拉伸模量分别从-90至114 ℃和3.1MPa至1.9GPa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体行为，具有从大的弹性变形中反复恢复的能力。作为这种制造策略的能力的证明，梯度材料在不到一分钟的时间内制造，具有多级形状记忆致动的空间控制特性。这种简单而强大的制造策略可以快速合成从弹性体到热固性材料的共聚物，并精确控制热机械性能。
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 degrees 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.