| In this paper, surface-modified nano-CaC03 (av.dia.70nm) was used to fill PVC. Firstly, the influence of the nano-filler on the impact and tensile strength, heat-resistant and processability of PVC under the condition of deferent matrix were studied. Then the effect of MG-423D on properties of PVC/nano-CaCO3 systems was discussed.When surface-modified nano-CaCO3 was used directly to PVC, the impact strength of the filling systems was improved dramatically and had a peak with 20phr filler, the maximum of which was triple than the impact strength of PVC without filler. The tensile strength of PVC with 0-15 filler almost remained the same. The ball-pressing hardness and heat-resistant were improved slightly. Meanwhile the processability of the filling system changed a little with the increase of filler. Scanning Electronic Microscope (SEM) Photographs showed that nano-particles conglomerated with 200~400nm in diameter in PVC continuous phase.Better mechanical properties can be achieved by using nano-CaCO3 combined with ACR. Nano-CaCO3 also did well in improving the properties of toughened PVC. the impact strength of PVC with 6phr ACR and 15phr nano-CaCO3 reached 74. SKJ.m2. SEM showed that ACR consisted in PVC phase with slice configuration. According to the ratio of PVC and ACR, it can be deduced that there were a great deal of PVC macromolecules in ACR disperse phase.MG-423D can improved the mechanical properties and heat resistant of PVC/nano-CaCO3, but the effect of MG-423D was limited At the same time process conditions had large impact on the ultimate properties of the filling systems.
|
PDF Full Text Request