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首页> 外文期刊>Journal of Applied Polymer Science >Effects of the properties of blowing agents on the processing and performance of extruded starch acetate
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Effects of the properties of blowing agents on the processing and performance of extruded starch acetate

机译：发泡剂性能对醋酸淀粉挤出工艺及性能的影响

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摘要

The extrusion of polysaccharide-based polymers, such as starch acetate, is quite different from that of ordinary synthetic polymers. To understand how the physiochemical properties of blowing agents affect plasticization and expansion processes, starch acetate was extruded with water, ethanol, and ethyl acetate. The studied properties and factors were the evaporation rate, surface tension, boiling point, solubility index, latent heat of vaporization of blowing agents, extrusion temperature, and nucleating- and blowing-agent concentrations. The properties of the blowing agents and operating conditions affected the solubility of the matrix polymer, the nucleation process, and cell growth, which affected the foam density and specific volume. A high temperature increased the cell density and specific volume when water and ethanol were used because a high temperature increased the solubility of starch acetate in water and ethanol and promoted nucleation. Ethyl acetate already had high solvency to starch acetate and a high evaporation rate. A high temperature reduced the melting strength, thereby reducing the cell density and specific volume. Water evaporation was greater, despite a high latent heat of evaporation (hr) and boiling point, than the average volumes of ethanol and ethyl acetate that evaporated. The blowing-agent efficiency was a function of the solvency, blowing-agent evaporation rate, and operating conditions. (C) 2005 Wiley Periodicals, Inc.
机译：多糖基聚合物（例如醋酸淀粉）的挤出与普通合成聚合物的挤出完全不同。为了了解发泡剂的物理化学性质如何影响增塑和膨胀过程，将乙酸淀粉与水，乙醇和乙酸乙酯一起挤出。研究的性质和因素是蒸发速率，表面张力，沸点，溶解度指数，发泡剂汽化潜热，挤出温度以及成核剂和发泡剂浓度。发泡剂的性质和操作条件影响基体聚合物的溶解度，成核过程和泡孔生长，从而影响泡沫密度和比容。当使用水和乙醇时，高温增加了细胞密度和比容，因为高温增加了乙酸淀粉淀粉在水和乙醇中的溶解度并促进了成核作用。乙酸乙酯已经具有对淀粉淀粉的高溶解能力和高蒸发速率。高温降低了熔融强度，从而降低了孔密度和比容。尽管蒸发潜热（hr）和沸点高，但水蒸发比蒸发的乙醇和乙酸乙酯的平均体积更大。发泡剂效率是溶解度，发泡剂蒸发速率和操作条件的函数。 （C）2005 Wiley期刊公司

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