A Dual Approach in Direct Ink Writing of Thermally Cured Shape Memory Rubber Toughened Epoxy,ACS Applied Polymer Materials

当前位置： X-MOL 学术 › ACS Appl. Polym. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A Dual Approach in Direct Ink Writing of Thermally Cured Shape Memory Rubber Toughened Epoxy
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-11-18 , DOI: 10.1021/acsapm.0c00839
Qiyi Chen ₁ , Thanyada Sukmanee ₂ , Lihan Rong ₁ , Matthew Yang ₁ , Jingbo Ren ₁ , Sanong Ekgasit ₂ , Rigoberto Advincula _{1,

3,

4}

Affiliation

Bisphenol A-based epoxies are much used in a wide range of composite and coating applications due to their excellent thermomechanical properties. However, their 3D printability remains a challenge with most reported materials suffering from high brittleness and low toughness. Here, we have described especially modified epoxy resins that enable 3D printing with both fast and slow curing rates. These materials exhibit greatly enhanced toughness, tunable thermomechanical properties, and excellent shape memory behavior. Two different printing systems, including a two-part static mixing printhead and a single extrusion printhead, were developed for fast- and slow-curing epoxies, respectively. The rheology of inks in both systems has been modified into printable thixotropic fluids with the aid of silica nanoparticles and other additives. Epoxide-functionalized telechelic polybutadiene was added into the resins, which are then introduced inside the epoxy network after cross-linking. The addition of polybutadiene rubber significantly improves the toughness (over 135%), fracture strain (over 200%), and shape memory behavior. By adding different amounts of the rubber telechelic, thermomechanical properties, including modulus, elongation, and T_g of epoxy, can be well controlled in a wide range to satisfy different applications.

中文翻译：

热固化形状记忆橡胶增韧环氧树脂直接书写的双重方法

基于双酚A的环氧树脂因其出色的热机械性能而广泛用于各种复合材料和涂料应用中。但是，对于大多数报道的材料来说，它们的3D可打印性仍然面临着高脆性和低韧性的挑战。在这里，我们已经描述了经过特别改性的环氧树脂，该环氧树脂能够以快速和缓慢的固化速度进行3D打印。这些材料具有极大的韧性，可调节的热机械性能和出色的形状记忆性能。开发了两种不同的打印系统，分别包括两部分静态混合打印头和单个挤出打印头，分别用于快固化和慢固化环氧树脂。借助于二氧化硅纳米颗粒和其他添加剂，两种体系中的油墨流变学已被改进成可印刷的触变流体。将环氧官能化的远螯聚丁二烯添加到树脂中，然后在交联后将其引入环氧网络内部。聚丁二烯橡胶的添加显着提高了韧性（超过135％），断裂应变（超过200％）和形状记忆性能。通过添加不同量的橡胶远螯，热力学性能包括模量，伸长率和环氧树脂的T _g可以在宽范围内得到很好的控制，以满足不同的应用。

更新日期：2020-12-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11