Study On The Ionic Cross-linking And Application Of Maleic Anhydride Grafted Ethylene-methacrylic Acid Co-polymer

There is an attracting research for ionic cross-linking modification in some of the inorganic-filled polymer filed,because the ionic cross-linked polymer material has excellent performance.Meanwhile,there is one of the hottest research spots about ionic cross-linking network structrues by blending for a co-polymer of ethylene-methyl acrylic acid grafted with maleic anhydride?Fusabond 514D?and zinc oxide?ZnO?.However,the research of the blend?514D/ZnO?as a modifier won't be report ever.Based on the advantagement of the ionic cross-linking network structures in 514D/ZnO,the blend is prepared by blending 514D with ZnO.The blend of 514D/ZnO was prepared by blending 514D and ZnO.Its properties and blending processes were characterized by using analysis methods such as fourier transform infrared spectroscopy?FT-IR?,thermo gravimetric analysis?TGA?,differential scanning measuring thermal analysis?DSC?,melt flow rate?MFR?,dynamic mechanical thermal analysis?DMA?,scanning electron microscopy?SEM?.The results showed that ionic cross-linking reaction take place over 160?.The ionic bonds were generated gradually and the FT-IR absorption peak of carboxylate appeared obviously with the reaction time.Eventurally,the ionic cross-linking network structures in 514D/ZnO had been formed.Besides,while the increasement of ZnO,the thermal decomposition temperature of 514D/ZnO changed from 454.9?to 466.7?.The storage modulus,the tensile strength and hardness of the blend materials of 514D/ZnO were increased from150 M Pa to 450 M Pa,22 MPa to 39 M Pa,and 49 Shore D to 59 Shore D,respectively.At the same time,the viscosity of the blend materials of 514D/ZnO has increased gradually owing to the melting flow rate?MFR?decrease from 2.48 g/10 min to 0.06 g/10 min.The cross-linking kinetic of 514D/ZnO was investigated by using a vulcameter.The results showed that the induction time?t₀?,the optimum curing time(t₉₀)and the minimum cross-linking torque?M_L?all reduced with the improvement of cross-linking temperature.On the contrast,both the maximum cross-linking torque?M_H?and the cross-linking reaction rate were rised.Otherwise,the cross-linking torque increased with the increase content of ZnO under cross-linkingconditions in the same temperature.What's more,while both the curing temperature and the mass fraction of ZnO were increased,the cross-linking reaction rate increased,the optimum cured times were shortened,and the cross-linking structures were strengthened.According to the cross-linking kinetics,it was found that correlation coefficient?r?of 514D/ZnO-phr7 was the largest one.Hence,the cross-linking kinetic analysis was more reliably.Meanwhile,it was found that apparent activation energy of the ionic cross-linking reaction for 514D/ZnO-phr7 was the minimum value.As a result,it would be considered that ionic cross-linking reaction was easily carried out.As a modifier of 514D/ZnO-phr7 in blending with EVA,the cross-linked and foamed material of EVA/514D/ZnO-phr7 was prepared,and it had excellent mechanical properties.Its hardness was in a range from 53 Shore C to 49 Shore C with the density from 0.10 g/cm³ to 0.091 g/cm³.The tensile strength,the elogation at break,and the rebound rate were greater than 3.5 M Pa,330%,4.4 N/mm,and 46%,respectively.And its compression set was less than40%.Besides,SEM analysis showed that the pore size of the cross-linked and foamed materials was ranged from 100?m to 200?m.