Radiation Property Study Of Biobased Polyamide And Its Preparation Of Functional Composites

Nowadays,with the growing attention of the depleting fossil feedstock and the corresponding environmental issues of fossil feedstock consumption,it is consistent with the concept of sustainable development and circular economy to develop durable and high-performance materials from biomass feedstock.In this study,a bio-based polyamide(BDIS)based on renewable monomers ltaconic acid(IA),sebacic acid(SA)1,4-diaminobutane(BD)and 1,10-diamniodecane(DD)has been synthetised.By controlling the molar contents of IA,the BDIS polyamides with some interesting properties can be obtained,such as good processibility from lower melting point,excellent toughness,even displayed rubbery after hydration,good spinnability,can even be dissolved in ethanol nontoxicity etc.In order to inprove their thermal stability,solvent resistance and mechanical properties,radiation crosslinking was conducted.Herein,by melt spinning,BDIS fibers were prepared,and then the fibers with different molecular weight were radiated at varying radiated doses.The results showed that the crosslinking degree was relative to molecular weight and radiated doses.It is easy to crosslink for the BDIS fibers with higher molecular weight under the same radiated dose.Moreover,polyamide is a polar polymer,which can be used to prepare dielectric material by introducing a dielectric filler.The surfaces of graphene oxide are highly oxygenated,bearing hydroxyl,epoxide,diol,ketone,and carboxyl functional groups that can more readily disperse in the polyamide matrix.In additon,graphene oxide,as a semiconductor material,can be used as a dielectric filler.In the study,graphene oxide was modified,such as graphene oxide-encapsulated carbon microsphere(GO-CNS),dopamine-wrapped graphene oxide(PDA-GO)etc.And then,by solution blending graphene/BDIS polyamide composites with high dielectric constant and low dielectric loss were obtained.It is concluded that the filling of GO-CNS decreased the addition of graphene oxide,in the meantime,the dielectric performance of the GO-CNS/BDIS composites can be further inproved by situ thermal reduction.The introduction of dopamine on the surface of graphene oxide prevented the restack of graphene oxide in the matrix,at the same time situ reduction happened on graphene oxide,so that PDA-GO/BDIS composites with higher dielectric constant and lower dielectric loss can be obtained.Above all,the characters of the said particles above were integrated into the PDA-GO-CNS particles,thus PDA-GO-CNS/BDIS composites possessed good dielectric performance under lower addition of graphene oxide without thermal reduction.