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首页> 外文期刊>Journal of Applied Polymer Science >Degradability of expanded starch/PVA blends prepared using calcium carbonate as the expanding inhibitor
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Degradability of expanded starch/PVA blends prepared using calcium carbonate as the expanding inhibitor

机译：以碳酸钙为膨胀抑制剂制备的膨化淀粉/ PVA共混物的降解性

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摘要

In this study, expanded starch/ poly(vinyl alcohol) (PVA) blends for packing material were prepared by using calcium carbonate as the expansion inhibitor to investigate the degradability and the structural and mechanical properties of expanded starch/PVA/calcium carbonate blends (ESPCs). The structure of ESPCs became more compact with increasing CaCO3 content and at least 2 parts of CaCO3 were required to obtain the sufficient inhibiting effect on the expansion. As CaCO3 content increased from 1 to 4 parts, tensile strength more than doubled from 70 to 180 KPa, while elongation at break increased about 1.5-fold. The moduli of ESPCs also increased with increasing CaCO3 content, but they decreased continuously with exposure to UV radiation over all periods of exposure and remained in the range of 10-15 KPa after exposure for 7 weeks. The weight loss of ESPCs due to exposure to soil environment increased with exposure time and the final weight loss after the 5-week exposure was about 25-30 % Specifically, the degradability of ESPC with 20 parts of PVA was 5% higher than that of ESPC with 30 parts of PVA. The water solubility of ESPC with 30 parts of PVA was somewhat higher than that of ESPC with 20 parts of PVA. Furthermore, most of ESPCs began to be degraded thermally at 292 (C) 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 911-919, 2004.
机译：在这项研究中，以碳酸钙为膨胀抑制剂制备了用于包装材料的膨化淀粉/聚乙烯醇（PVA）共混物，以研究膨化淀粉/ PVA /碳酸钙共混物（ESPC）的降解性以及结构和机械性能。 ）。随着CaCO3含量的增加，ESPC的结构变得更致密，需要至少2份CaCO3才能获得足够的膨胀抑制效果。随着CaCO3含量从1-4份增加，拉伸强度从70 KPa增加到180 KPa增加了一倍以上，而断裂伸长率增加了约1.5倍。 ESPC的模量也随着CaCO3含量的增加而增加，但是在所有暴露时间段中，随着暴露于紫外线辐射而不断降低，并且在暴露7周后保持在10-15 KPa范围内。由于暴露于土壤环境而导致的ESPC重量损失随暴露时间的增加而增加，暴露5周后的最终重量损失约为25％至30％。具体而言，使用20份PVA的ESPC的可降解性要比暴露于土壤中的ESPCs高5％。具有30份PVA的ESPC。具有30份PVA的ESPC的水溶性比具有20份PVA的ESPC的水溶性稍高。此外，大多数ESPC在292（C）2004 Wiley Periodicals，Inc. J Appl Polym Sci 93：911-919，2004上开始热降解。

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