Abstract:

The laboratory synthesized thermotropic liquid crystalline polyamide (TLCP) was solutionblended with polyamide 6 (PA6) with different contents. The effects of content of TLCP on the compatibility was investigated by Ubbelohde Viscometer, DSC, FTIR and SEM. Thermal analyses demonstrate that the addition of TLCP decreases the melting temperature of PA6, exhibiting the compatibility. FTIR clearly identified a specific intermolecular interaction between PA6 and TLCP due to the similarity in their structures. Particles coprecipitated from the solutions were manifested by SEM that as TLCP content is above 5% the interface becomes ambiguous. When TLCP content is up to 40%, the morphology is homogenous without obvious phase separation due to strong molecular interactions. Characterizations on blends support the idea that the incorporation of hydrogen bond interaction could induce the compatibility of the blends, of which components are in procession of the same amide group in the molecular structure.

Key words: organic polymer material, thermal liquid crystalline polyamide, compatibility, polyamide 6, hydrogen bonding