Structural relationships in blends of isotactic polypropylene and polymers with aliphatic sequences
Structural relationships in blends of isotactic polypropylene and polymers with aliphatic sequences
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DOI：
10.1002/polb.1986.090240713
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发表时间：
1986-07
期刊：
影响因子：
--
通讯作者：
B. Lotz;J. Wittmann
中科院分区：
文献类型：
--
作者：
B. Lotz;J. Wittmann
等规聚丙烯和聚乙烯或聚酰胺的共混物经常显示出非常不寻常的结晶形态，其中螺旋状和线状聚合物的链轴彼此成大角度。这些晶体形态是基于一种特殊的外延关系来解释的，这种外延关系依赖于iPP（010）平面上存在的一排排甲基，它们相距近5-A。所有观察到的形态的结构基础是PE或聚酰胺的脂肪段与iPP甲基行平行排列（反之亦然），以及PE或PA链与iPP甲基行之间近5-A距离的匹配。这种不寻常的外延关系的含义相对于明显的“普遍性”的聚合物成核剂进行了检查。
Blends of isotactic polypropylene and polyethylene or polyamides often display highly unusual crystalline morphologies in which the chain axes of the helical and linear polymers are at large angles to each other. These crystalline morphologies are explained on the basis of a specific epitaxial relationship that rests on the existence, in the (010) plane of iPP, of rows of methyl groups nearly 5-A apart. The structural basis of all the observed morphologies is the parallel alignment of the aliphatic segments of the PE or polyamides and of the iPP methyl rows (or vice versa) and matching of the near 5-A distances between PE or PA chains and iPP methyl rows. The implications of this unusual epitaxial relationship with respect to the apparent “universality” of polymer nucleating agents are examined.