Rapid Synthesis of Elastomers and Thermosets with Tunable Thermomechanical Properties.
Rapid Synthesis of Elastomers and Thermosets with Tunable Thermomechanical Properties.
复制标题
DOI：
10.1021/acsmacrolett.0c00233.s008
复制
发表时间：
2020-05
影响因子：
5.8
通讯作者：
Leon M. Dean;Qiong Wu;Omar Alshangiti;Jeffrey S. Moore;N. Sottos
中科院分区：
文献类型：
--
作者：
Leon M. Dean;Qiong Wu;Omar Alshangiti;Jeffrey S. Moore;N. Sottos
研究了1,5-环二烯（COD）的正面开环复分解聚合（FROMP）在环境条件下快速、无溶剂合成聚（1,4-丁二烯）的方法。此外，用COD和双环戊二烯（DCPD）的混合物制备具有广泛可调性能的交联共聚物是很容易的。具体来说，通过控制单体比例，玻璃化转变温度和拉伸模量分别在-90 ~ 114℃和3.1 MPa ~ 1.9 GPa之间变化。具有亚环境玻璃化转变温度的共聚物表现出强大的弹性体行为，具有从大弹性变形中反复恢复的能力。为了证明这种制造策略的能力，梯度材料在不到一分钟的时间内制造出来，具有空间控制特性，可用于多级形状记忆驱动。这种简单而强大的制造策略可以快速合成从弹性体到热固性聚合物的共聚物，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 °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.