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首页> 外文期刊>Journal of Applied Polymer Science >Clay distribution and crystalline structure evolution in polyamide 6/montmorillonite composites prepared by activated anionic polymerization
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Clay distribution and crystalline structure evolution in polyamide 6/montmorillonite composites prepared by activated anionic polymerization

机译：活化阴离子聚合制备聚酰胺6 /蒙脱土复合材料中的粘土分布和晶体结构演变

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摘要

Nanostructured polymer composites (NPC) based on polyamide 6 (PA6) are prepared by activated anionic ring-opening polymerization (AAROP) of mixtures of ε-caprolactam (ECL) and organically treated montmorillonite (o-MMT). The polymerization is performed in bulk, at 165°C, i.e., below the melting point of the resulting APA6, the reaction time being in the range of 10-15 min. The o-MMT content is varied in the 0.5-10% range. X-ray diffraction (XRD) and transmission electron microscopy (TEM) show that exfoliated NPC can be produced with clay loads of 0.5-1.0%. Larger clay amounts lead to various degrees of intercalation of the MMT layers. FT-IR imaging proves that all NPCs contain MMT aggregates with sizes in the 10-20 μm range. The formation of the matrix crystalline structure is followed directly by performing AAROP of an activated ECL/o-MMT blend in a synchrotron beamline. Irrespective of the o-MMT type and concentration, it is the α-PA6 that forms first and in larger amounts. The γ-PA6 polymorph can be found in predominating amounts only after melting and recrystallization of the already produced polymer matrix.
机译：基于聚酰胺6（PA6）的纳米结构聚合物复合材料（NPC）是通过ε-己内酰胺（ECL）和有机处理蒙脱石（o-MMT）混合物的活化阴离子开环聚合（AAROP）制备的。聚合反应是在165℃，即低于所得APA6的熔点的条件下进行的，反应时间为10-15分钟。 o-MMT含量在0.5-10％范围内变化。 X射线衍射（XRD）和透射电子显微镜（TEM）表明，剥落的NPC的粘土含量为0.5-1.0％。较大的粘土量导致MMT层的不同程度的嵌入。 FT-IR成像证明所有NPC都包含MMT聚集体，其尺寸在10-20μm范围内。在同步加速器束线中直接进行活化的ECL / o-MMT共混物的AAROP之后，即可直接形成基质晶体结构。不论o-MMT的类型和浓度如何，都是首先形成大量的α-PA6。仅在已经产生的聚合物基质熔融和重结晶之后，才能发现γ-PA6多晶型物占主导地位。

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