Impact-responsive layer based on encapsulated solid/liquid non-Newtonian polymers
Impact-responsive layer based on encapsulated solid/liquid non-Newtonian polymers
复制标题
DOI：
10.1117/12.2660419
复制
发表时间：
2023-04
期刊：
影响因子：
--
通讯作者：
A. Hegazy;Konstantinos Myronidis;M. Meo;F. Pinto
中科院分区：
文献类型：
--
作者：
A. Hegazy;Konstantinos Myronidis;M. Meo;F. Pinto
在这项工作中，球形化作为一种封闭技术的冲击响应凝胶进行了研究，最终设计的最终目标是作为保护设备的智能层的形式，用于保护运输中的微妙货物。所研究的智能保护层利用基于聚硼硅氧烷的非牛顿聚合物（即剪切硬化凝胶（SSG））的受控分布，其可以响应外部刺激，即，快速的机械负荷，通过吸收大量的能量，从而产生对上述货物的保护。首先，对智能保护层的成分进行了机械表征，确定了SSG的基本机制及其通过相变发生吸收能量的能力，并将其量化为比硅胶高约5倍。在第二阶段，完成了对最佳封装方法和几何布置的彻底调查。通过静态和动态测试评估最终设计的性能，结果表明，与传统的层相比，含有SSG的层显示出上级性能，能够自主地为基材提供保护。特别是，新的智能层增加了第一次和最终的压缩失效应力约50%，而在同一时间的最大力量失败之前，在低速冲击（LVI）测试约高出50%，在整个调查的冲击能量水平。这项工作的结果使这些新型智能保护层成为各种应用的理想解决方案，其中极其脆弱和有价值的货物在运输过程中，需要最大限度地减少或消除冲击力，例如相机镜头，电子元件，血液瓶和其他医疗产品，克服了传统包装材料的缺点。
In this work, spherification was investigated as an incapsulation technique for an impact-responsive gel, with the ultimate objective of the final design being employed as protective equipment in the form of smart layers for protecting delicate goods in transit. The smart protective layers investigated utilised the controlled distribution of a polyborosiloxane based non-Newtonian polymer, namely shear stiffening gel (SSG), which can respond to an external stimulus i.e., a rapid mechanical load, by absorbing a large amount of energy, thus resulting in the protection of the aforementioned goods. At first instance, the constituents of the smart protective layers underwent mechanical characterisation, where the underlying mechanism of the SSG and its ability to absorb energy via means of a phase transition occurrence was established and quantified to be approximately five times higher compared to silicone. At a second stage, a thorough investigation of the optimal encapsulation method and geometrical arrangement was completed. The performance of the final design was assessed via static and dynamic tests which demonstrated that the layers containing SSG displayed superior performance compared to conventional ones, being able to autonomously offer protection to the substrates. In particular, the novel smart layers increased first and final compressive failure stresses by approximately 50%, whereas at the same time the maximum forces prior to failure in low velocity impact (LVI) tests were approximately 50% higher, across the investigated impact energy levels. The results of this work establish these novel smart protective layers as an ideal solution in a wide variety of applications where extremely fragile and valuable goods are in transit and impact forces need to be minimised or eliminated, such as camera lenses, electrical components, blood vials, and other medical products, overcoming the drawbacks of traditional packaging materials.