Characterisation of PVC/NBR and PVC/ENR50 binary blends and PVC/ENR50/NBR ternary blends by DMA and solid state NMR

摘要

The structure and dynamics of the binary blends PVC/NBR and PVC/ENR, and the PVC/ENR/NBR ternary blen were investigated by dynamic mechanical analysis and solid state NMR. Samples were prepared by mechanical blendin at .I 50"C. The effect of the change in the composition of the polymer blends, on the tan 15 peak width, the tan 15max and are under the tan 11 curve were used to understand the miscibility and damping properties. Solid state 13C-NMR measurc ments were carried out to determine several relaxation time parameters: rotating frame and laboratory frame proton an carbon relaxation times. Cross-polarisation times and carbon relaxation times were interpreted based on the changes i the molecular motion. Proton relaxation times were interpreted based on the heterogeneity of the matrix. Resul confirmed phase separation between) and § nm length scale.