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首页> 外文会议>International Conference on Structural Nano Composites >Advanced materials based on polymer blends/polymer blend nanocomposites
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Advanced materials based on polymer blends/polymer blend nanocomposites

机译：基于聚合物共混物的先进材料/聚合物共混纳米复合材料

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Processability, morphology, mechanical properties and rheological behavior of poly(vinylchloride) (PVC)/poly(ethylmethacrylate) (PEMA) blends and PVC/PEMA/montmorillonite (MMT) composites, prepared by melt processing in a brabender mixer, were studied. Samples were characterized using SEM, mechanical testing, DMTA and a parallel plate rheometer. Plastograms show that there is noticeable drop of fusion times and increase in melt viscosity torque of both, polymer blend and polymer blend nanocomposite, in comparison with those of neat PVC. SEM images show that homogenous dispersions are obtained. Tensile tests indicate that PVC/PEMA and PVC/PEMA/MMT samples have greater tensile strength and elastic modulus and lower elongation compared to PVC. When solid viscoelastic properties are considered (DMTA), slightly higher storage moduli are obtained whereas more prominent increase of storage modulus is observed when nanoclay particles are added in a PVC/PEMA matrix. From the calculated area of tandelta peak of all tested samples, nanocomposites exhibit the lowest damping behavior. Oscillatory measurements in a molten state were used for determining the frequency dependencies of storage G' and loss G" moduli. It was found that G" curves of neat PVC lie above those of G' suggesting that PVC behaves like viscoelastic liquid. Similar results, but with significantly higher values of G' and G" over the whole frequency range for PVC/PEMA blends were obtained. Steady shear measurements show that the presence of PEMA and nanoclay particles increases the shear stress and shear viscosity of neat PVC. In order to define the rheological equations of state the three material functions were determined. According to these functions (η(γ), ψ_1, (γ), ψ_2 (γ)) all samples exhibit shear thinning behavior and the curves obey the power law equation. As rheological behaviour was found to be strongly dependent on blend's micro and macro structure and it is one of the main factors defining the end properties, attempt was made to use this material functions to define the structure-properties relationship of polymer blends/polymer blend nanocomposites.
机译：的加工性，形态，机械性能和聚（氯乙烯）的流变行为（PVC）/聚（甲基丙烯酸乙酯）（PEMA）共混物和PVC / PEMA /蒙脱石（MMT）的复合材料，通过熔融加工在Brabender混合器中制备，进行了研究。使用SEM，机械测试，DMTA和平行板流变仪的样品进行表征。 Plastograms表明，有融合倍明显下降和在两者的熔融粘度扭矩增加，聚合物共混物和聚合物共混物纳米复合材料，在与那些PVC整齐的比较。 SEM图像显示，获得均匀的分散体。拉伸试验表明，PVC / PEMA和PVC / PEMA / MMT样品具有较大的抗拉强度和弹性模量和伸长率较低相比PVC。当固体粘弹性性质被认为是（DMTA），被而当纳米粘土颗粒在PVC / PEMA矩阵被加入，观察到储能模量的更突出的增加得到稍高的储能模量。从所有测试的样品的tandelta峰的面积计算，纳米复合材料显示出最低的阻尼行为。在熔融状态下的振动测量用于确定存储G的频率依赖关系“和损耗G‘模量。结果发现，G’整齐PVC谎言上述那些的G的曲线”表明PVC行为就像粘弹性液体。得到类似的结果，但与G”和G”的在整个频率范围为PVC / PEMA共混物显著更高的值。稳态剪切测量表明，PEMA和纳米粘土颗粒的存在增加的剪切应力和整齐PVC的剪切粘度。为了定义状态的流变学方程式确定了三个材料的功能。根据这些函数（η（γ），ψ_1，（γ），ψ_2（γ））的所有样品表现出剪切稀化行为，而曲线服从幂律方程。作为流变行为被发现是强烈地依赖于共混物的微观和宏观结构和它的定义最终性能的主要因素之一，尝试了使用该材料的功能来定义的聚合物共混物的结构 - 性能关系/聚合物混合纳米复合材料。

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