Manufacture of Syntactic Foams Using Starch as Binder: Post-Mold Processing
Manufacture of Syntactic Foams Using Starch as Binder: Post-Mold Processing
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DOI：
10.1080/10426910802413661
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发表时间：
2008-10
影响因子：
4.8
通讯作者：
Md Mainul Islam;H. Kim
中科院分区：
文献类型：
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作者：
Md Mainul Islam;H. Kim
基于空心微珠的浮力，研究了复合泡沫的制造方法，即“后成型加工”，以用于潜在的建筑材料应用。模制后处理包括将淀粉颗粒和陶瓷中空微球在水中混合。结果发现，在混合过程中，淀粉颗粒倾向于粘附到中空微球上，形成附聚物。还发现，“使相对密度为1.0的微球上的淀粉颗粒的体积分数”（VFSMRD）是混合物体积转变的指标。混合物的最大总体积膨胀和相分离后混合物体积在混合容器中在水中形成的过渡（称为“顶相”）都发生在计算的VFSMRD处。结果表明，空心微球的粒径效应对淀粉颗粒的吸附作用较大，但对IBVMS的吸附作用不明显。对于一定直径的圆柱形容器，水的加入量对淀粉微球的聚集没有影响。讨论了淀粉微球间距，认为它是影响淀粉微球聚集体中淀粉含量的一个重要参数。采用一个简单的立方体细胞模型的淀粉-微球间距定量解释各种影响的淀粉含量在团聚，如空心微球的尺寸，空心微球的初始体积（IBVMS），和水的体积。此外，对于所制造的复合泡沫体，发现以下情况：（a）对于给定的实验数据范围，泡沫体中淀粉的体积分数与混合前的淀粉含量呈线性关系，以及（B）对于具有高淀粉含量的小中空微球，收缩率相对较高。
Syntactic foam manufacturing method, ‘post-mold processing,’ based on the buoyancy of hollow microspheres was studied for potential building material applications. The post-mold processing involves mixing starch particles and ceramic hollow microspheres in water. It was found starch particles tend to adhere to hollow microspheres, forming agglomerations, during mixing. It was also found that “volume fraction of starch particles on a microsphere making a relative density of 1.0” (VFSMRD) is an indicator for mixture volume transitions. Both the maximum total volume expansion of mixture and a transition in formation, after phase separation, of mixture volume in water referred to as “top phase” in a mixing container were taken place at a calculated VFSMRD. It was found that hollow microsphere size effect on attracting starch particles was relatively high but IBVMS effect was not significant. Also, no effect of water volume for a given diameter of cylindrical container was found. Starch-microsphere inter-distance was discussed and considered to be an important parameter affecting starch content in an agglomeration. A Simple Cubic cell model for the starch-microsphere inter-distance was adopted to quantitatively explain various effects on starch content in agglomeration such as hollow microsphere size, initial bulk volume of hollow microspheres (IBVMS), and water volume. Further, the following were found for manufactured syntactic foams: (a) volume fraction of starch in foam is of linear relation with starch content before mixing for a given experimental data range and (b) shrinkage is relatively high for small hollow microspheres with high starch content.