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Cross-Linking Vitrimers after Melt Processing Using Supramolecularly Masked Dynamic Cross-Linkers
Macromolecules ( IF 5.1 ) Pub Date : 2024-08-23 , DOI: 10.1021/acs.macromol.4c01363 Georges J. M. Formon 1 , Jonathan Jayaratnam 1 , Clément Guibert 2 , Nathan J. Van Zee 1 , Renaud Nicolaÿ 1
Macromolecules ( IF 5.1 ) Pub Date : 2024-08-23 , DOI: 10.1021/acs.macromol.4c01363 Georges J. M. Formon 1 , Jonathan Jayaratnam 1 , Clément Guibert 2 , Nathan J. Van Zee 1 , Renaud Nicolaÿ 1
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Vitrimers are permanent polymer networks with dynamic covalent bonds that allow them to be reshaped and recycled. Although they are often promoted as an ideal class of materials situated between thermosets and thermoplastics, vitrimers are usually far more difficult to process than thermoplastics because their melt viscosity gradually decreases with increasing temperature. They are thus subject to a challenging trade-off between processability and mechanical performance, limiting their practical utility. Herein, we report the concept of a supramolecularly masked cross-linker that enables a vitrimer precursor to be processed as a thermoplastic before being thermally cured to form a vitrimer. The cross-linker features hydrogen bonding groups that promote aggregation and phase separation, allowing for it to be melt-blended with a functional thermoplastic at low temperature with minimal cross-linking. After shaping, the loaded thermoplastic is heated to a suitably high curing temperature to disassemble the aggregated cross-linker, thereby unmasking the cross-linker for reacting with the functionalized matrix. The resulting cured elastomeric vitrimers exhibit excellent thermomechanical properties along with mechanical and chemical recyclability. The latter consists of recovering the vitrimer precursor, which can be further reprocessed as a thermoplastic and converted back to a vitrimer after melt processing.
中文翻译：
使用超分子掩蔽动态交联剂在熔融加工后交联 Vitrimer
Vitrimer 是具有动态共价键的永久聚合物网络，可以重塑和回收。尽管它们经常被宣传为介于热固性塑料和热塑性塑料之间的理想材料，但玻璃体通常比热塑性塑料更难加工，因为它们的熔体粘度随着温度的升高而逐渐降低。因此，它们在加工性能和机械性能之间面临着具有挑战性的权衡，限制了它们的实际用途。在此，我们报告了超分子掩蔽交联剂的概念，该交联剂使玻璃体前体能够在热固化形成玻璃体之前被加工为热塑性塑料。该交联剂具有促进聚集和相分离的氢键基团，使其能够在低温下以最小的交联与功能性热塑性塑料熔融共混。成型后，将负载的热塑性塑料加热至适当高的固化温度以分解聚集的交联剂，从而暴露交联剂以与官能化基质反应。所得固化弹性体玻璃体表现出优异的热机械性能以及机械和化学可回收性。后者包括回收 vitrimer 前体，该前体可以进一步重新加工为热塑性塑料，并在熔融加工后转化回 vitrimer。
更新日期：2024-08-23
中文翻译：
使用超分子掩蔽动态交联剂在熔融加工后交联 Vitrimer
Vitrimer 是具有动态共价键的永久聚合物网络，可以重塑和回收。尽管它们经常被宣传为介于热固性塑料和热塑性塑料之间的理想材料，但玻璃体通常比热塑性塑料更难加工，因为它们的熔体粘度随着温度的升高而逐渐降低。因此，它们在加工性能和机械性能之间面临着具有挑战性的权衡，限制了它们的实际用途。在此，我们报告了超分子掩蔽交联剂的概念，该交联剂使玻璃体前体能够在热固化形成玻璃体之前被加工为热塑性塑料。该交联剂具有促进聚集和相分离的氢键基团，使其能够在低温下以最小的交联与功能性热塑性塑料熔融共混。成型后，将负载的热塑性塑料加热至适当高的固化温度以分解聚集的交联剂，从而暴露交联剂以与官能化基质反应。所得固化弹性体玻璃体表现出优异的热机械性能以及机械和化学可回收性。后者包括回收 vitrimer 前体，该前体可以进一步重新加工为热塑性塑料，并在熔融加工后转化回 vitrimer。
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