Steam-Chest Molding of Expanded Polypropylene Foams. 2. Mechanism of Interbead Bonding
Steam-Chest Molding of Expanded Polypropylene Foams. 2. Mechanism of Interbead Bonding
复制标题
膨胀聚丙烯泡沫的蒸汽室成型。
DOI：
10.1021/ie101753w
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发表时间：
2011-05-04
影响因子：
4.2
通讯作者：
Park, Chul B.
中科院分区：
文献类型：
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作者：
Zhai, Wentao;Kim, Young-Wook;Park, Chul B.
使用蒸汽箱模塑法加工膨胀聚丙烯（EPP）珠粒泡沫。在加工过程中形成的珠间粘合，其特征在于通过使用扫描电子显微镜（SEM）观察产品表面和断裂表面，并通过测量试样的拉伸性能。结果表明，EPP珠粒间结合程度和拉伸强度与蒸汽压力/温度有直接关系，高蒸汽温度有利于EPP珠粒在冷却过程中的结晶行为。如本系列的第一篇文章（Zhai et al.Ind.Eng.Chem.Res.2010，49，9822）中所讨论的，基于晶体熔融行为提出了加工过程中珠间粘合的形成机理。可能的参数影响形成interbead粘合，即，蒸汽温度/压力和珠泡沫膨胀比，在这项研究中进行了调查。研究了EPP制品退火后对制品收缩率和结晶度的影响。
Expanded polypropylene (EPP) bead foams were processed using steam-chest molding. Interbead bonds formed during processing and was characterized by observing both the product surface and the fracture surfaces using scanning electron microscopy (SEM) and by measuring the tensile properties of specimens. It was found that both the degree of interbead bonding and the tensile strength had a direct relationship to the steam pressure/temperature and that high steam temperature enhanced the crystallization behavior of EPP beads during the cooling process. A formation mechanism of interbead bonding during processing was proposed based on the crystal melting behaviors, as discussed in the first article of this series (Zhai et al. Ind. Eng. Chem. Res. 2010, 49, 9822). Possible parameters influencing the formation of interbead bonding, namely, steam temperature/pressure and bead foam expansion ratio, were investigated in this study. The effect of postannealing of the EPP products on the shrinkage and crystallinity o...