Curing kinetics effect on thermo-mechanical properties of an epoxy resin cured by imidazolium-based ionic liquid

IF 2.4 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal Pub Date : 2024-11-17 DOI:10.1007/s13726-024-01420-8

Mohammad Modirrousta, Hassan Fattahi, Mehrzad Mortezaei, Mehran Jahani

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引用次数: 0

Abstract

One of the main limiting factors of conventional epoxy latent curing agents applied in advanced composite manufacturing industries is to cure reactions after activation. Therefore, a precise control cannot be achieved on the prepreg preservation even at low temperatures. This leads to a reduce shelf-life of the prepreg. To overcome these problems, 1-ethyl-3-methylimidazolium dicyanamide ([EMI]N(CN)₂) ionic liquid was used in this study to control linear growth or crosslinking reactions. In this respect, the effect of different curing cycles was investigated on the curing reactions and properties of the cured resins. To fulfill this aim, different parameters including curing behavior, formulation viscosity, gel point, interlaminar shear strength (ILSS) and dynamic mechanical thermal analysis (DMTA) were investigated. The results showed that different curing mechanisms engage in different curing cycles. Linear growth is dominant at 140 °C, while crosslinking reactions are occurred at 220 °C. The network structures of the epoxy cured by [EMI]N(CN)₂ are strongly influenced by the initial curing temperatures. The maximum ILSS for the sample containing 5 phr ionic liquid was 62.07 MPa and 39.70 MPa at 25 °C and 75 °C, respectively.

Graphical Abstract

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固化动力学对咪唑基离子液体固化环氧树脂热机械性能的影响

传统环氧潜固化剂在先进复合材料制造业中应用的主要限制因素之一是活化后的固化反应。因此，即使在低温下，也无法精确控制预浸料的保存。这导致预浸料的保质期缩短。为了克服这些问题，本研究采用1-乙基-3-甲基咪唑双氰酰胺（[EMI]N(CN)2）离子液体来控制线性生长或交联反应。在此方面，研究了不同的固化周期对固化树脂的固化反应和性能的影响。为了实现这一目标，研究了不同的参数，包括固化行为、配方粘度、凝胶点、层间剪切强度（ILSS）和动态机械热分析（DMTA）。结果表明，不同的固化机制导致不同的固化周期。在140℃时以线性生长为主，而在220℃时发生交联反应。[EMI]N(CN)2固化后环氧树脂的网状结构受初始固化温度的影响较大。含5 phr离子液体样品在25℃和75℃时的最大ILSS分别为62.07 MPa和39.70 MPa。图形抽象

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.