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首页> 外文期刊>Journal of Applied Polymer Science >A new method to improve the stability, tensile strength, and heat resistant properties of shape-memory epoxy resins: Two-stages curing
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A new method to improve the stability, tensile strength, and heat resistant properties of shape-memory epoxy resins: Two-stages curing

机译：提高形状记忆环氧树脂的稳定性，拉伸强度和耐热性的新方法：两阶段固化

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摘要

In this article, we design a new thermal curing method: two-stage curing. The purpose of using this approach is to maintain the excellent shape-memory property of epoxy resin system after first stage curing, and the material can be folded in small size to storage or transportation and recovery its original shape commodiously by heating temperature. Then, after second stage curing, the stability, glass transition temperature(T_g), and tensile strength of material can be improved effectively. For this aim, a series of mixtures have been prepared. Differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), tensile test, scanning electron microscope (SEM), dynamic mechanical analysis (DMA), and fold-deploy shape-memory test have been used to characterize the feasibility of two-stage curing process, curing degree, tensile strength, morphology, thermodynamic properties, and shape-memory performance of these polymers. DSC results show that two independent curing stages can be achieved successfully. Tensile tests and DMA results suggest that tensile strength and heat resistance have been improved after the second curing stage. SEM results reveal that the addition of latent curing agent do not change the fracture mechanism. Furthermore, the fold-deploy shape-memory tests prove that the composites after first stage curing possess eximious shape-memory property.
机译：在本文中，我们设计了一种新的热固化方法：两阶段固化。使用这种方法的目的是在第一步固化后保持环氧树脂体系优异的形状记忆性能，并且该材料可以小尺寸折叠以存储或运输，并通过加热温度适当恢复其原始形状。然后，在第二阶段固化之后，可以有效地提高材料的稳定性，玻璃化转变温度（T_g）和拉伸强度。为此目的，已经制备了一系列混合物。差示扫描量热法（DSC），傅里叶变换红外光谱（FTIR），拉伸试验，扫描电子显微镜（SEM），动态力学分析（DMA）和折叠展开形状记忆试验已被用来描述两种方法的可行性-这些聚合物的固化阶段，固化程度，抗张强度，形态，热力学性质和形状记忆性能。 DSC结果表明，可以成功地实现两个独立的固化阶段。拉伸试验和DMA结果表明，第二固化阶段后拉伸强度和耐热性得到了改善。 SEM结果表明，加入潜在的固化剂不会改变断裂机理。此外，折叠展开形状记忆测试证明了第一阶段固化后的复合材料具有优异的形状记忆性能。

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