Crystallization of a Polyamide 6/Montmorillonite Nanocomposite at Rapid Cooling
Crystallization of a Polyamide 6/Montmorillonite Nanocomposite at Rapid Cooling
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DOI：
10.1002/mame.201200253
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发表时间：
2013-09
影响因子：
3.9
通讯作者：
D. Mileva;A. Monami;D. Cavallo;G. C. Alfonso;G. Portale;R. Androsch
中科院分区：
文献类型：
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作者：
D. Mileva;A. Monami;D. Cavallo;G. C. Alfonso;G. Portale;R. Androsch
采用扫描芯片量热法和广角X射线散射法研究了聚酰胺6/有机改性蒙脱土（PA 6/OMMT）纳米复合材料的结晶行为，重点考察了过冷/降温速率对PA 6基体结晶/中间相多晶型的影响。OMMT的存在对PA 6在低冷却速率下α-晶体形成动力学的影响可以忽略不计，而在快速冷却时观察到γ-中间相的成核增强。此外，OMMT的加入导致完全玻璃化无定形状态所需的冷却速率的明显增加。实验结果表明，在聚合物加工过程中，OMMT在PA 6/OMMT纳米复合材料中的成核作用在冷却条件下尤为重要。
The crystallization behavior of a polyamide 6/organo-modified montmorillonite (PA 6/OMMT) nanocomposite has been investigated by scanning chip calorimetry and wide-angle X-ray scattering, with emphasis placed on the evaluation of the effect of supercooling/cooling rate on the crystal/mesophase polymorphism of the PA 6matrix. Presence of OMMT has negligible effect on the kinetics of formation of alpha-crystals of PA 6 at low cooling rate while there is observed enhanced nucleation of gamma-mesophase on fast cooling. Furthermore, addition of OMMT leads to a distinct increase of the cooling rate required to completely vitrify the amorphous state. The performed experiments demonstrate that the nucleating effect of OMMT in PA 6/OMMT nanocomposites is of particular importance at cooling conditions relevant in polymer processing.