The influence of cellular structure on physical performance of EVA/TPE blend foam

• Main Authors: Chun-Che Cheng, 鄭鈞哲
• Other Authors: Hsien-Tang Chiu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/gb62z7

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 106 === The purpose of this study was to investigate the effects of different foaming agents, VA contents, TPE blending, and different processing methods on the physical properties of EVA foaming. We use foaming agent as follow: inorganic foam masterbatch-EE405F, organic foam masterbatch-7300, and organic foaming agent-AC3000F. We choose VA contents 18% and 26% of EVA. To Improve physical properties, we use two kinds of TPE. One is POE, which has straight chemical chain. And the other is SEBS, which has partially physically cross-linked. We use micro compounder to blend the sample, then put into molded foaming, two-stage foaming, or the extruder for foaming of three-layer film. To determine the temperature of processing and thermal properties analysis of substrates, we use TGA and DSC in the study. Record the viscosity at different temperatures when using the micro compounder. Use SEM to observe the shape of the cell. Use moving die (foam pressure) rheometer to analyze the pressure of foaming and the degree of crosslinking. Test the characteristics of density, tensile strength, tear strength, compression set, DMA, etc. after foaming. As a result, it was found that the effect of the foaming agent on the foaming properties of EVA can be improved by using an inorganic foaming agent. VA% doesn’t have obvious effect on physical properties. TPE blended with EVA foam can improve physical properties, especially with SEBS. Different foaming processes have little effect on the physical properties of EVA foam, but it can be used to control the physical properties of foamed materials.