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首页> 外文期刊>Journal of Applied Polymer Science >Structure and physical properties of EVA/starch precursor materials for foaming applications
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Structure and physical properties of EVA/starch precursor materials for foaming applications

机译：发泡用EVA /淀粉前体材料的结构和物理性能

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摘要

The use of biodegradable materials to develop polymeric blends visioning distinct applications is desirable and nowadays is an important research field. In this work, blends of an ethylene-vinyl acetate copolymer (EVA) and 30, 50, and 70% in weight of an unmodified corn starch have been successfully fabricated. The structure of these blends have been characterized using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR). It was found that the original starch particles are kept in the blends forming a separate phase from EVA. The FTIR confirmed that EVA and starch comprise a physical mixture in the blends. Besides, the blends were found very homogenous and mainly amorphous with the EVA melting temperature being independent of the starch content. The melt flow index (MFI) decreased for higher contents of starch, revealing that starch acts as a filler in the blends. Physical properties such as density, hardness, and thermal conductivity were found to increase with the content of starch in the blends. Considering one of the goals of this research, which is producing foams using these blends as precursor materials, the structural and physical characteristics determined here are very satisfactory and open good perspectives in this sense.
机译：使用可生物降解的材料开发具有不同应用前景的聚合物共混物是理想的，并且如今已成为重要的研究领域。在这项工作中，已经成功地制备了乙烯-乙酸乙烯酯共聚物（EVA）与30、50和70％重量的未改性玉米淀粉的共混物。这些共混物的结构已使用扫描电子显微镜（SEM），热重分析（TGA），差示扫描量热法（DSC）和傅里叶变换红外光谱（FTIR）进行了表征。发现原始淀粉颗粒保留在共混物中，形成与EVA分离的相。 FTIR证实EVA和淀粉是混合物中的物理混合物。此外，发现共混物非常均匀并且主要是无定形的，EVA的熔融温度与淀粉含量无关。淀粉含量较高时，熔体流动指数（MFI）降低，表明淀粉在共混物中起填充剂的作用。发现物理性质，例如密度，硬度和热导率随掺合物中淀粉含量的增加而增加。考虑到这项研究的目标之一就是使用这些共混物作为前体材料来生产泡沫，因此在此确定的结构和物理特性非常令人满意，并为此开辟了良好的前景。

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