Stress Relaxation via Covalent Dynamic Bonds in Nanogel-Containing Thiol–Ene Resins,ACS Macro Letters

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Stress Relaxation via Covalent Dynamic Bonds in Nanogel-Containing Thiol–Ene Resins
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-04-30 , DOI: 10.1021/acsmacrolett.0c00275
Guangzhe Gao ₁ , Xun Han ₂ , Nancy Sowan ₁ , Xinpeng Zhang ₂ , Parag K Shah ₂ , Mingtao Chen ₂ , Christopher N Bowman ₂ , Jeffrey W Stansbury _{1,

2,

3}

Affiliation

Functional nanogels are attractive additives for use in polymer composites. In this study, nanogels with internal allyl sulfide moieties throughout their network structure were prepared via a thiol-Michael addition reaction. The excess thiol-functionalized nanogels were less than 60 nm as discrete particles but act as room-temperature liquids in the bulk state. The reactive nanogels can be dispersed in and swollen by a thiol–ene matrix resin, which upon photopolymerization yields dramatically decreased levels of polymerization shrinkage stress. Furthermore, the postcured nanogel-modified polymers effectively relaxed applied stresses as well as enhanced toughness during exposure to a UV light source that activated the addition–fragmentation as a means for dynamic bond exchange. These nanogels provide a generic approach to introduce adaptable network performance that significantly improves a number of key properties of glassy cross-linked polymer.

中文翻译：

含纳米凝胶的硫醇-烯树脂中通过共价动态键的应力松弛

功能性纳米凝胶是用于聚合物复合材料的有吸引力的添加剂。在这项研究中，通过硫醇-迈克尔加成反应制备了在整个网络结构中具有内部烯丙基硫醚部分的纳米凝胶。过量的硫醇官能化纳米凝胶作为离散颗粒小于 60 nm，但在本体状态下充当室温液体。反应性纳米凝胶可以分散在硫醇-烯基树脂中并被其溶胀，在光聚合时会产生显着降低的聚合收缩应力水平。此外，后固化的纳米凝胶改性聚合物在暴露于紫外光源期间有效地缓解了施加的应力并增强了韧性，激活了加成-断裂作为动态键交换的手段。

更新日期：2020-04-30

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