Effect of crystals and fibrous network polymer additives on cellular morphology of microcellular foams
Effect of crystals and fibrous network polymer additives on cellular morphology of microcellular foams
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DOI：
10.1063/1.4918399
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发表时间：
2015-05
影响因子：
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通讯作者：
Ryoma Miyamoto;Tatsumi Utano;Shunya Yasuhara;S. Ishihara;M. Ohshima
中科院分区：
文献类型：
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作者：
Ryoma Miyamoto;Tatsumi Utano;Shunya Yasuhara;S. Ishihara;M. Ohshima
本研究以1，3：2，4-双-O-(4-甲基亚甲基)-D-山梨醇为凝胶剂(Gel-ALL MD)或纤维网络聚合物添加剂(Metablen 3000)为原料，采用芯背发泡注射成型法制备了微孔聚丙烯(PP)泡沫。助剂和助剂都能有效地控制泡沫塑料中的泡孔形态，但方式不同。在模腔中使用Gel-all MD冷却聚合物的过程中，该试剂促进了结晶的成核，导致了大量的小晶体。在发泡过程中，晶体起到了有效的气泡成核剂的作用。因此，该试剂大大减小了细胞尺寸，增加了细胞密度。此外，细小的晶体为膨胀的细胞壁提供了不均匀性，并产生了具有纳米级原纤维结构的高开放细胞含量。Gell-All和Metablene 3000在熔体中形成凝胶状的纤维网络。该网络增加了伸长粘度，并有防止细胞壁断裂的趋势。
In this study, the core-back foam injection molding was used for preparing microcelluar polypropylene (PP) foam with either a 1,3:2,4 bis-O-(4-methylbenzylidene)-D-sorbitol gelling agent (Gel-all MD) or a fibros network polymer additive (Metablen 3000). Both agent and addiive could effectively control the celluar morphology in foams but somehow different ways. In course of cooling the polymer with Gel-all MD in the mold caity, the agent enhanced the crystal nucleation and resulted in the large number of small crystals. The crystals acted as effective bubble nucleation agent in foaming process. Thus, the agent reduced the cell size and increased the cell density, drastically. Furthermore, the small crystals provided an inhomogenuity to the expanding cell wall and produced the high open cell content with nano-scale fibril structure. Gell-all as well as Metablene 3000 formed a gel-like fibrous network in melt. The network increased the elongational viscosity and tended to prevent the cell wall from breaking ...