Cross-Linking Agents for Enhanced Performance of Thermosets Prepared via Frontal Ring-Opening Metathesis Polymerization
Cross-Linking Agents for Enhanced Performance of Thermosets Prepared via Frontal Ring-Opening Metathesis Polymerization
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DOI：
10.1021/acs.macromol.0c01530
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发表时间：
2020-10-13
期刊：
影响因子：
5.5
通讯作者：
Sottos, Nancy R.
中科院分区：
文献类型：
--
作者：
Ivanoff, Douglas G.;Sung, Jaeuk;Sottos, Nancy R.
前沿聚合（FP）是一种自蔓延反应，其中反应区以稳定的速度在单体溶液中传播。使用FP，聚合物材料以最小的能量输入快速固化。在这里，我们通过双环戊二烯（DCPD）与基于顺丁烯二烯的交联共聚单体的正面开环易位聚合（FROMP）生产高玻璃化转变温度热固性材料，从而能够调节交联密度。通过改变树脂中交联共聚单体的量，聚（DCPD）系统的玻璃化转变温度系统地从138至219摄氏度变化。超过5 cm.min（-1）的前速度能够快速、无溶剂地生产具有99%固化度和57 MPa屈服强度的热固性材料。所述DCPD-异戊二烯共聚单体树脂以比传统烘箱固化低6个数量级的能量固化，并且具有比通过FROMP制备的DCPD的所报道的热固性材料高近90 ° C的T-g。
Frontal polymerization (FP) is a self-propagating reaction in which the reactive zone propagates through a monomer solution at a steady velocity. Using FP, polymeric materials are cured rapidly with minimal energy input. Here, we produce high-glass-transition-temperature thermosets via frontal ring-opening metathesis polymerization (FROMP) of dicyclopentadiene (DCPD) with norbornene-based cross-linkable co-monomers that enable tuning of the cross-link density. The glass-transition temperatures of poly(DCPD) systems are systematically varied from 138 to 219 degrees C by altering the amount of cross-linking co-monomers in the resin. Front velocities exceeding 5 cm.min(-1) enable rapid, solvent-free production of thermoset materials with a 99% degree of cure and yield strength of 57 MPa. The DCPD-norbornene co-monomer resins are cured with 6 orders of magnitude less energy than a traditional oven cure and have a T-g nearly 90 degrees C higher than reported thermosets of DCPD prepared via FROMP.