Preparation and properties of expandable epoxy foam prepreg for sandwich composites prepared via thermal expansion molding process,Journal of Applied Polymer Science

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Preparation and properties of expandable epoxy foam prepreg for sandwich composites prepared via thermal expansion molding process
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-11-30 , DOI: 10.1002/app.53469
Wei Min ₁ , Liangliang Qi ₁ , Xinxing Zhao ₁ , Jie Xiao ₂ , YuJia Wan ₃ , Muhuo Yu ₁ , Zeyu Sun ₁

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Thermal expansion molding process (TEMP) is a new technology for integrated molding sandwich composites. However, the development of high-performance expandable foam prepreg limits the scale applications of this technology. In this study, epoxy foam prepreg (M-1) with expandable function was used to prepare foams with different expansion ratios via restricted foaming. Three suitable expansion ratios were determined to prepare foam sandwich composites by analyzing the density, bubble sizes, compressive strength, and expansion pressures of expandable foam. The maximum expansion pressure produced by four, six, and eight times of foam expansion were 251, 160, and 115 kPa, respectively. Tensile test and digital imaging computer technology confirmed that with the increase of foam expansion ratio, the strength decreased, but the plastic deformation ability increased. Failure modes such as foam matrix fracture, glass fiber mat fracture, and mutual-slipping between the foam matrix and glass fiber mat occur during the stretching process. Finally, the PMI/M-1 foam hybrid sandwich composites with three structures were prepared via the TEMP technology, which verified the feasibility of this technology in forming sandwich composites.

中文翻译：

热膨胀成型夹层复合材料用可发性环氧泡沫预浸料的制备及性能

热膨胀成型工艺（TEMP）是一种一体化成型夹层复合材料的新技术。然而，高性能可发性泡沫预浸料的开发限制了该技术的规模化应用。本研究采用具有发泡功能的环氧泡沫预浸料（M-1），通过限流发泡制备不同发泡倍数的泡沫。通过分析可膨胀泡沫的密度、气泡尺寸、抗压强度和膨胀压力，确定了三种合适的膨胀率来制备泡沫夹层复合材料。泡沫膨胀四次、六次和八次产生的最大膨胀压力分别为251、160和115 kPa。拉伸试验和数字成像计算机技术证实，随着泡沫膨胀比的增加，强度下降，但塑性变形能力增加。拉伸过程中出现泡沫基体断裂、玻纤毡断裂、泡沫基体与玻纤毡相互滑移等失效模式。最后，通过TEMP技术制备了具有三种结构的PMI/M-1泡沫混杂夹层复合材料，验证了该技术成型夹层复合材料的可行性。

更新日期：2022-11-30

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