Study On Compatibilization Of PP/PA6 Blends

Polypropylene as a general plastic is very popular in building materials,electronic divices,and electrical industries.But its own shortcomings limit the application of it.In order to expand its application,by melt blending polypropylene(PP)/nylon 6(PA6),the impact toughness of composites can be improved.But the two blends alone can not effectively achieve the desired effect due to they belong to thermodynamic incompatibility system.Therefore,studying of the compatibility of PP/PA6 blends is of great significance.In this paper,the blending system of PP and PA6 with a crystal was first studied.PP/15%PA6 was selected as the substrate.The effects on PP/PA6 of its micostructure and macroscopic properties from self-made compatibilizer SEBS-g-DBM were studied,comparing with the uncoated elastomer SEBS system.And characterized by SEM,XRD,DSC,PLM and other microstructure characterization and mechanical properties was investigated.It is found by DSC that PA6 contributes to the heterogeneous nucleation of PP in the matrix while PP crystallization peak temperature Tc and crystallinity was increased.It can be seen from SEM that the size of PA6 decreases with the increase of the content of SEBS-g-DBM and the distribution is gradually uniform.Combined with the mechanical properties of the experimental data,it is can be concluded that the addition of compatibilizer SEBS-g-DBM increases the impact toughness of the system by adding elastomer SEBS.The reason for the difference is that the mechanism of SEBS-g-DBM and SEBS is different.SEBS-g-DBM not only acts as a toughening effect of elastomers,but also play a compatibilizer on the system of compatibilizing effect.On the basis of PP/15%PA6,we studied the blends of PP and PA6 with β nucleation.The effects of different β nucleating agents on the β-crystallinity and mechanical properties of the system were studied.By the same structural characterization and performance testing methods,the results show that the P nucleating agent migrates to the PA6 phase due to polarity resulting in a decrease in the β crystal content in PP.Further more,the multi-walled carbon nanotubes are complexed with beta nucleating agents,and with that the β-MWCNTs/PP/PA6 blends were studied.Through microstructure characterization and mechanical properties testing,it can be seen that MWCNTs solve the βnucleation problem in PP,slowed the migration of β nucleating agent to PA6 phase and Significantly increased the β crystal content.Through the mechanical performance test can be found that Appropriate β-MWCNTs can significantly improve the impact toughness of P-MWCNTs/PP/PA6 composites.Although tensile strength decreases with increasing content,but compared to the β-PP/PA6 system it was increased.Thus,complex β-nucleating agent can effectively improve the migration of β-nucleating agent alone in PP/PA6 system and can improve the impact strength and tensile strength of the system.Finally,the β-MWCNTs/PP/PA6 blends were blended with compatibilized compatibilizer SEBS-g-DBM.By structural characterization and performance testing methods,the results show that Appropriate amount of compatibilizer SEBS-g-DBM can play a role in the blending system,refine the spherulite particles and disperse the dispersed phase PA6 more evenly.The dispersed particle size becomes smaller.The interfacial tension of the two phases reduced and the compatibility of the two phases was improved.The addition of SEBS-g-DBM can increase the content of β crystal.Through the mechanical performance test found that Appropriate amount of compatibilizer SEBS-g-DBM can improve the atmospheric and low temperature impact strength of β-MWCNTs/PP/PA6/SEBS-g-DBM composites,but the tensile strength showed a certain degree of decline.