Synthesis, Structure And Properies Of Polyamide 1010/Clay Composites

This paper is divided into three parts.The first part is to prepare intercalated montmorillonites (MMT) which are intercalated by benzylcetyldimethylammonium chloride (HDBAC) and hexadecyl trimethyl ammonium bromide (CTAB), respectively. X-ray diffraction (XRD), infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA), and Transmission electron microscopy (TEM) have been used to analyze the structure of intercalated MMT.1) HDBAC and CTAB can effectively expand the layer of MMT and two organic montmorillonites OMMT (A) and OMMT (B) were prepared.2) HDBAC can be used to expand the distance of layer to about 0.5nm, CTAB can be also utilized to expand the distance of layer to nearly 0.7nm. They can insert into the layer, but the intercalation is not perfect. Intercalation ratio of HDBAC is 74% and the intercalation ratio of CTAB is 79%.3) TGA curves indicate that OMMT (A) has good thermal stability than OMMT(B).The second part is to prepare PA1010/OMMT nanocomposites by melt compounding. After injection molding, mechanical properties, thermal stability, melting and crystallization behavior and the microstructure of the nanocomposites were analyzed.1) The three OMMT (A, B, C) are dispersed well in PA1010 at low content and all of they are intercalated into PA1010.2) With the addition of OMMT, tensile strength of PAA, PAB and PAC increases at low content and then decreases. The tensile strength of PAA, PAB is the best at the content of 6% and PAC at the content of 2%. Impact strength of PAA, PAB and PAC decreases with the content increasing.3) Compared with PA1010, glass transition temperature of the composites has a slight rise, while the storage modulus of the composites has a more substantial increase. It indicates that OMMT can reinforce the composites well.4) DSC results illuminate that OMMT have no significant effect on the melting temperature of the composites, but crystallization temperature of the composites significantly increases.5) The thermal stability of the composites has slight decrease.The third part is to prepare PA1010/inorganic modified clay composites by melt compounding. After injection molding, mechanical properties, thermal stability, melting and crystallization behavior and the microstructure of the composites were analyzed.1) Under the low content of three types of inorganic modified clays (MSTi65(A), ZINKA55(B), ZINMOEX56(C)), the materials are characterized as microcomposites, but the inorganic modified clays can be dispersed very well in PA1010.2) With the addition of clays, tensile strength increases at low addition and then decreases. The tensile strength of PBA, PBC is the best at the content of 2% and PBB at the content of 4%. Impact strength of the composites decreases.3) Compared with PA1010, glass transition temperature of PBA and PBB has a slight rise, while the storage modulus has a more substantial increase. It indicates that inorganic modified montmorillonite can reinforce the composites well. For PBC, glass transition temperature and storage modulus have no significant changes.4) DSC results illuminate that clay have no significant effect on the melting temperature of the composite material, but crystallization temperature of the composites significantly increases.5) The thermal stability of the composites has slight decrease. And the thermal stability of PBC composites decreased obviously.