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首页> 外文期刊>Journal of Applied Polymer Science >INFLUENCE OF GLYCEROL AND WATER CONTENT ON THE STRUCTURE AND PROPERTIES OF EXTRUDED STARCH PLASTIC SHEETS DURING AGING
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INFLUENCE OF GLYCEROL AND WATER CONTENT ON THE STRUCTURE AND PROPERTIES OF EXTRUDED STARCH PLASTIC SHEETS DURING AGING

机译：老化过程中甘油和水分含量对挤出淀粉塑料结构和性能的影响

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The properties of starch plastic sheets were investigated by stress-strain measurements in relation with starch crystallinity. Granular potato starch was plasticized with different amounts of glycerol and water by extrusion. The materials were amorphous directly after processing. During aging above the glass transition temperature at various humidities single helical (V and E-type) and double helical (B-type) crystallinity was formed. The rate of crystallization is a function of water and glycerol content. The amorphous rubbery materials were soft and weak with high elongations. During aging the materials became less flexible with higher elastic modulus and tensile stress. The changes are related to changes in water content and glass transition temperature and to changes in B-type crystallinity. The changes in stress-strain properties are explained by the formation of helical structures and crystals, which results in a reinforcement of the starch network by physical crosslinking. (C) 1997 John Wiley & Sons, Inc. [References: 32]
机译：通过与淀粉结晶度相关的应力应变测量研究了淀粉塑料片的性能。通过挤出将马铃薯淀粉颗粒用不同量的甘油和水增塑。加工后，材料直接为非晶态。在各种湿度下于玻璃化转变温度以上老化期间，形成单螺旋（V型和E型）和双螺旋（B型）结晶度。结晶速率是水和甘油含量的函数。无定形橡胶状材料柔软且弱，具有高伸长率。在老化期间，材料变得较不柔韧性，具有较高的弹性模量和拉伸应力。这些变化与水含量和玻璃化转变温度的变化以及B型结晶度的变化有关。应力-应变性质的变化可以通过螺旋结构和晶体的形成来解释，这可以通过物理交联来增强淀粉网络。 （C）1997 John Wiley＆Sons，Inc. [参考：32]

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