TLCPa对PA 6/PA 66相容性及结晶行为的影响

采用溶液共混法制备了聚酰胺6(PA 6)／聚酰胺66(PA 66)/热致聚酰胺液晶(TLCPa)共混物,分析了TLCPa对PA 6／PA 66相容性及结晶行为的影响。差示扫描量热法分析表明,TLCPa的加入改善了PA 6和PA 66之间的相容性,PA 6／PA 66共混物结晶受到抑制;傅里叶变换红外光谱研究表明,TLCPa和PA 6、PA 66分子间形成了大量的分子间氢键,是TLCPa改善共混物相容性的主要原因;广角X射线衍射分析表明,TLCPa的加入没有影响共混物的晶型结构,当w(TLCPa)大于10％时,共混物的结晶度明显下降。

Influence of TLCPa on miscibility and crystallization behavior of PA 6/PA 66 blends

Nylon 6/nylon 66/thermotropic liquid crystalline polyamide (PA 6/PA 66/TLCPa) blends were prepared by solution blending process. Miscibility and crystallization behavior of the blends were investigated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy and wide angle diffractometry (WAXD). The analyses by DSC reveal that the introduction of TLCPa improves the miscibility between nylon 6 and nylon 66 and furthermore, suppresses the crystallization of PA 6/PA 66 blend. The Fourier transform infrarecl spectroscopy spectra prove that a great amount of intermolecular hydrogen bonding form between TLCPa and PA 6 or PA 66 molecules, that is recognized as the main function of TLCPa played in improving miscibility of the blends. The addition of TLCPa does not bring about any impact on the crystallographic form or crystal structure of the blends, but the crystallinity significantly lowers when the mass fraction of TLCPa exceeds 10%, as confirmed by the WAXD analyses.