| Summary: | 碩士 === 國立宜蘭大學 === 化學工程與材料工程學系碩士班 === 100 === One of efficiency methods to enhance the properties of polymeric materials and broaden their practical usages is addition of appropriate amount of reinforcement fillers. In this study, nanocomposites of styrene–butadiene copolymers were prepared. Two types of copolymers were selected. One is linear structure, while the other one is radial. Both have the styrene/butadiene ratios of 3/7. Reinforcement fillers were nanoclays; and addition levels were 5 phr and 10 phr based on polymer matrix. Crosslinking matrixs were also considered. The prepared samples were evaluated their dynamic mechanical properties, tensile properties, and steady shear flow. Dynamic mechanical data were in linear deformation region, whereas tensile and steady shear flow data were non-linear deformation in nature. Time-temperature superposition, Cole-Cole plot, and strain-time correspondence applied to experimental data. Effect of reinforce filler on the dynamic mechanical properties were more profound for non-crosslinking matrix than for crosslinking matrix. In addition, matrix in radial structures has more significant enhancement than that in linear structure. When compared with linear deformation in dynamic mechanical data, nonlinear deformation in tensile was observed softening phenomenon in early stage extension. A softening factor was used, and it is able to discriminate various types of samples. The dynamic mechanical properties in molten state indicated that the effect of additional nanoclay on the linear structure matrix is more significant than that on radial structure matrix. However, samples prepared from radial structure showed more elastic. In molten state, crosslinking samples also showed a higher extent of elasticity than clay-containing samples.
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