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首页> 外文期刊>Polymers >Quasi-Static Behavior of Palm-Based Elastomeric Polyurethane: For Strengthening Application of Structures under Impulsive Loadings
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Quasi-Static Behavior of Palm-Based Elastomeric Polyurethane: For Strengthening Application of Structures under Impulsive Loadings

机译：棕榈基弹性聚氨酯的准静态行为：用于增强结构在脉冲载荷下的应用

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In recent years, attention has been focused on elastomeric polymers as a potential retrofitting material considering their capability in contributing towards the impact resistance of various structural elements. A comprehensive understanding of the behavior and the morphology of this material are essential to propose an effective and feasible alternative to existing structural strengthening and retrofitting materials. This article presents the findings obtained from a series of experimental investigations to characterize the physical, mechanical, chemical and thermal behavior of eight types of palm-based polyurethane (PU) elastomers, which were synthesized from the reaction between palm kernel oil-based monoester polyol (PKO-p) and 4,4-diphenylmethane diisocyanate (MDI) with polyethylene glycol (PEG) as the plasticizer via pre-polymerization. Fourier transform infrared (FT-IR) spectroscopy analysis was conducted to examine the functional groups in PU systems. Mechanical and physical behavior was studied with focus on elongation, stresses, modulus, energy absorption and dissipation, and load dispersion capacities by conducting hardness, tensile, flexural, Izod impact, and differential scanning calorimetry tests. Experimental results suggest that the palm-based PU has positive effects as a strengthening and retrofitting material against dynamic impulsive loadings both in terms of energy absorption and dissipation, and load dispersion. In addition, among all PUs with different plasticizer contents, PU2 to PU8 (which contain 2% to 8% ( w / w ) PEG with respect to PKO-p content) show the best correlation with mechanical response under quasi-static conditions focusing on energy absorption and dissipation and load dispersion characteristics.
机译：近年来，考虑到弹性体聚合物对各种结构元件的抗冲击性的贡献，注意力已集中在弹性体聚合物上作为潜在的改型材料。全面了解这种材料的行为和形态对于提出有效和可行的替代现有结构加固和翻新材料至关重要。本文介绍了从一系列实验研究中获得的发现，以表征八种类型的棕榈基聚氨酯（PU）弹性体的物理，机械，化学和热行为，这些弹性体是由棕榈仁油基单酯多元醇之间的反应合成的（PKO-p）和4,4-二苯基甲烷二异氰酸酯（MDI），其中聚乙二醇（PEG）通过预聚合作用。进行了傅里叶变换红外（FT-IR）光谱分析以检查PU系统中的官能团。通过进行硬度，拉伸，挠曲，悬臂梁式冲击和差示扫描量热法测试，研究了机械和物理行为，重点是伸长率，应力，模量，能量吸收和耗散以及载荷分散能力。实验结果表明，在能量吸收和耗散以及负载分散方面，基于棕榈的PU作为增强和改装材料可抵抗动态脉冲负载，具有积极的作用。此外，在所有具有不同增塑剂含量的PU中，PU2至PU8（相对于PKO-p含量含有2％至8％（w / w）PEG）在准静态条件下表现出与机械响应的最佳相关性。能量吸收和耗散以及负载分散特性。

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