Chemomechanics in the Moisture-Induced Malleability of Polyimine-Based Covalent Adaptable Networks,Macromolecules

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Chemomechanics in the Moisture-Induced Malleability of Polyimine-Based Covalent Adaptable Networks
Macromolecules ( IF 5.1 ) Pub Date : 2018-11-28 00:00:00 , DOI: 10.1021/acs.macromol.8b02046
Chaoqian Luo ₁ , Zepeng Lei ₂ , Yiqi Mao ₃ , Xiaojuan Shi _{1,

4} , Wei Zhang ₂ , Kai Yu ₁

Affiliation

The moisture-induced malleability of polyimine-based covalent adaptable networks (CANs) enables the thermosets to be reprocessed and recycled at ambient temperature using only water, which leads to an energy-neutral green processing of the materials. This paper provides both experimental and theoretical studies to understand the effects of temperature and moisture content on the kinetics of bond exchange reactions (BERs), malleability, in situ softening, and damping effects of polyimine-based CANs. The study shows that the temperature and moisture content are equivalent in affecting the time scale of network stress relaxation. A time–temperature–moisture superposition principle is therefore established. The modeling theory identifies the critical thicknesses when the network relaxation is dominated by the moisture diffusion or the intrinsic BER kinetics. It also probes the transition region of polyimine CANs underwater, in which the glassy solid samples gradually transform into the malleable state with an enhanced damping ratio.

中文翻译：

水分诱导的基于聚亚胺的共价适应性网络的可延展性的化学力学

水分诱导的基于聚亚胺的共价适应性网络（CAN）的延展性使热固性塑料仅在水的条件下即可在环境温度下进行再加工和再循环，从而实现了材料的能量中性绿色加工。本文提供了实验和理论研究，以了解温度和水分含量对键交换反应（BER），延展性，原位动力学的影响基于聚亚胺的CAN的软化和阻尼效应。研究表明，温度和水分含量等效于影响网络应力松弛的时间尺度。因此建立了时间-温度-湿度叠加原理。当网络松弛受水分扩散或固有BER动力学支配时，建模理论确定了临界厚度。它还在水下探查了聚亚胺CAN的过渡区域，在该过渡区域中，玻璃状固体样品以增加的阻尼比逐渐转变为可延展状态。

更新日期：2018-11-28

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