The Promoting Effect of Multifunctional Groups on the Thermal and Mechanical Properties of PVC Materials

The development of PVC materials grafted with mannich base originated from myrcene(P-MAM-g,where the mannich base derived from myrcene is abbreviated as MAM)via green and effective synthetic methods is a good strategy to avoid unacceptable discoloration and deterioration of thermal and mechanical properties caused by autocatalytic dehydrochlorination(DHC)during PVC processing.In this study,MAM with double bonds,amino groups,ester groups,and phospholipid groups was introduced into the chains of PVC to improve the thermal stability of PVC.The experimental results showed that the covalent attachment of MAM to PVC enhanced both the initial and the long-term stability of PVC.The enhanced performance of P-MAM-g compared with unmodified PVC is attributed to the simultaneous introduction of double bonds and amino groups into the PVC structure.The double bonds trapped the unstable chlorine atoms originated from the degradation of the PVC chain and reacted with the labile macromolecular radicals originated from PVC,thus inhibiting the radical degradation of the PVC chain.Furthermore,the amino groups absorbed the HCl produced in the degradation of PVC,inhibiting the adverse effects of HCl.P-MAM-g displayed better intrinsic flexibility and anti-migration ability of organic functional components compared with the control PVC materials.A possible stabilizing mechanism of the P-MAM-g was also presented.

Fabrication of graphene modified CeO_(2)/g-C_(3)N_(4)heterostructures for photocatalytic degradation of organic pollutants

A specific type S-scheme photocatalyst CeO_(2)@N-GO/g-C_(3)N_(4)was successfully synthesized,resulting in a 2-mer-captobenzothiazole(MBT)degradation rate of 100%,which is more than twice that of g-C_(3)N_(4)and CeO_(2).The improved degradation performance can be attributed to the introduction of N-graphene oxide(N-GO),which facilitates the electron transfer.Additionally,the unique Ce^(4+)→Ce^(3+)conversion property enhances the charge carrier utilization,and thereby the photocatalytic activity.Furthermore,theoretical calculations suggest the formation of an interfacial internal electric field(IEF)formed between CeO_(2)(the(200)and(311)planes)and g-C_(3)N_(4)(the(002)plane)to enhance the delocalization of the charge carriers.Moreover,various photo-electrochemical analyses are employed for the in-depth mechanism on MBT degradation and IEF-induced S-scheme over CeO_(2)@N-GO/g-C_(3)N_(4),where the differential charge proves the electron transfer path from CeO_(2)to g-C_(3)N_(4)that significantly prolongs its lifetime.The radical capture and electron spin resonance(ESR)results proved the existence of the active species of·OH,·O_(2)^(-),and h^(+)in the S-scheme photocatalytic system.

Utilization of porous liquids for catalytic conversion

Porous liquids,an emerging type of flowing liquid materials,are composed of porous solids and polymer chains/sterically hindered sol-vents,combining the advantages of porous solids'permanent porosity and liquid's fluidity.Therefore,porous liquids have shown enormous potentials in many applications.However,these applications are limited to gas adsorption[1],transport[2]and separation[3],which is unfa-vorable for the development of porous liquids.Therefore,expanding the application of porous liquids in other fields is quite meaningful.