Influence Of Pore Structure And Aging Time On The Mechanical Properties Of Cu/LDPE Composites

The influence of pore structure and aging time on the mechanical properties ofCu/LDPE composite has been studied in this paper.During the research on the porosity, we used DTBHQ, antioxidants2246, thecompound of DTBHQ and antioxidants2246(mass ratio is1:1) as porogen to obtain threekinds of experimental samples of Cu/LDPE porous composite with different porosity(corresponding, respectively, denoted as the PCP series, PCD series and PCPD series). Theresults show that the mechanical properties of the PCP series porous composites decreasewith the increasing of porosity. The elongation at break of the PCD series porouscomposites increases, the tensile strength and the elastic modulus decrease with theincreasing of the porosity and decreasing speed is getting smaller and smaller. The testresults of mechanical properties of PCPD series porous composite materials show that the,the greater the porosity, the greater the elongation at break, the smaller the tensile strengthand elastic modulus of the porous composites.During the research on the morphology, We used the mass fraction ratios ofAntioxidant2246and DTBHQ being0:10,3:7,5:5,7:3and10:0, the total mass fractionof the mixture are30%as the porogen to obtain five kinds of Cu/LDPE porous compositeswith different pore morphologies (referred to as the PC series). The results of themechanical properties of the Cu/LDPE porous composites with different poremorphologies show that the elongation at break, the tensile strength and the elasticmodulus gradually increased with the increasing of the mass fraction of the antioxidants2246added to the sample preparation process during the tensile test.During the research on the aging time, the hygrothermal aging tests have beenperformance on the Cu/LDPE composite. The mechanical properties after hygrothermalaging have been studied on the Cu/LDPE composite, the results show that with theincreasing of aging time, the elongation at break, the elastic modulus and the tensilestrength of the Cu/LDPE composite was first increasing an then decreasing, thenstabilizing, the range of the changes are very small. Those demonstrated that Cu/LDPEcomposite has excellent anti-aging properties. These results are very important and they can be applied to guide the design ofCu/LDPE porous composite IUD for use in the future clinical application.