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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Studies on phase morphology and thermo-physical properties of nitrile rubber blends
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Studies on phase morphology and thermo-physical properties of nitrile rubber blends

机译：丁腈橡胶共混物的相形态和热物理性质的研究

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The study deals with the morphological and thermal analysis of binary rubber blends of acrylonitrile-co-butadiene rubber (NBR) with another polymer. Either ethylene propylene diene terpolymer (EPDM), ethylene vinyl acetate (EVA), chlorosulphonated polyethylene (CSM), or polyvinyl chloride (PVC) has been selected for the second phase. Depending on the relative polarity and interaction parameter of the components, the binary blends showed development of a bi-phasic morphology through scanning electron microscopy (SEM). Use of different types of thermal analysis techniques revealed that these blends are generally incompatible excepting one of NBR and PVC. Derivative differential scanning calorimetry (DDSC), in place of conventional DSC, has been used to characterize the compatibility behavior of the blends. NBR–PVC shows appearance of only one glass transition temperature (T g) averaging the individual T g’s of the blend components. The partially missible blend of NBR and CSM shows a broadening of T g interval between the phase components, while the immiscible blends of either NBR–EPDM or NBR–EVA do not show any change in T g values corresponding to the individual rubbers of their blend. The experimental T g values were also compared with those calculated theoretically by Fox equation and observed to match closely with each other. Studies have also been made to evaluate the thermal stability of these blends by thermo-gravimetric analysis (TG) and evaluation of activation energy of respective decomposition processes by Flynn and Wall method. Thermo-mechanical analysis (TMA) was found to be effective for comparison of creep recovery and dimensional stability of the blends both at sub-ambient as well as at elevated temperatures.
机译：这项研究涉及丙烯腈-共-丁二烯橡胶（NBR）与另一种聚合物的二元橡胶共混物的形态和热分析。第二阶段选择了乙烯丙烯二烯三元共聚物（EPDM），乙烯乙酸乙烯酯（EVA），氯磺化聚乙烯（CSM）或聚氯乙烯（PVC）。取决于组分的相对极性和相互作用参数，二元共混物通过扫描电子显微镜（SEM）显示出双相形态的发展。使用不同类型的热分析技术表明，除了NBR和PVC之一以外，这些共混物通常不相容。衍生差示扫描量热法（DDSC）代替了常规DSC，已被用来表征共混物的相容性。 NBR-PVC仅显示出一个玻璃化转变温度（T g ）的平均值，该温度是混合组分中各个T g 的平均值。 NBR和CSM的部分混溶混合物表明相成分之间的T g 区间变宽，而NBR-EPDM或NBR-EVA的不混溶混合物的T 没有任何变化。 g 值对应于其混合物中的各个橡胶。还将实验的T g 值与通过Fox方程理论计算的值进行了比较，并观察到彼此非常匹配。还已经进行了研究，以通过热重分析（TG）评估这些共混物的热稳定性，并通过Flynn和Wall法评估各个分解过程的活化能。发现热机械分析（TMA）可有效地比较混合物在低于室温和高温下的蠕变回复率和尺寸稳定性。

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