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Synthesis of metals stearate and thermal degradation study of polystyrene metals stearate blends

机译：硬脂酸金属盐的合成及聚苯乙烯金属硬脂酸盐混合物的热降解研究

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Transition metals had been reported to act as effective pro oxidative additive for polymers. This study deals with the synthesis and characterization of three active transition metals complexes such as cobalt stearate, cupric stearate, and ferric stearate. A derivative of active transition metals stearate were synthesized by increasing the pH of metal acetate solution stirred with stearic acid in the presence of sodium hydroxide (NaOH) at 80 oC. The formula for the trimer as prepared is [CH3 (CH2)nCOO]M (M= metal). The melting points of the additives were obtained by differential scanning calorimetry (DSC) which resulted 94.33 oC, 99.85 oC and 66.90 oC respectively. Thermogravimetric analysis (TGA) was also conducted to study the thermal stabilities of the additives. The study also involved the investigation of the effect of the oxidative additives on the degradation process of general purpose polystyrene (GPPS). The additives were blended with GPPS with the formulation 0.05-0.20 wt %. Studies on the effects of additives were then carried out by exposing the samples into the oven at 70 oC, 90 oC and 100 oC respectively for 50 hours. The chemical and mechanical changes induced by this exposure were followed by fourier transform infrared spectroscopy (FTIR), melt flow index (MFI), tensile test, TGA and DSC. Surface morphologies of degraded samples were observed by using scanning electron microscopy (SEM). The FTIR result indicates that carbonyl compound had the most significant changes for cobalt stearate at 1756.8-1800 cm-1. The absorption around band 1756.8 cm-1 which can be assigned to the stretching of C=O functionalities, increased in intensity and broadened substantially, indicating the presence of the most effective oxidation product which is cobalt stearate. The thermo oxidative degradation in presence of metals stearate was found that all the additives effective were at 0.2 wt % according to the following arrangement cobalt> cupric>ferric in 90 oC air exposure.
机译：据报道，过渡金属可作为聚合物的有效促氧化添加剂。这项研究涉及三种活性过渡金属配合物的合成和表征，例如硬脂酸钴，硬脂酸铜和硬脂酸铁。活性过渡金属硬脂酸酯的衍生物是通过在氢氧化钠（NaOH）存在下于80 oC下增加与硬脂酸搅拌的乙酸金属盐溶液的pH值来合成的。所制备的三聚体的分子式为[CH 3（CH 2）n COO] M（M ＝金属）。通过差示扫描量热法（DSC）获得添加剂的熔点，其分别为94.33℃，99.85℃和66.90℃。还进行了热重分析（TGA），以研究添加剂的热稳定性。该研究还涉及对氧化性添加剂对通用聚苯乙烯（GPPS）降解过程的影响的研究。将添加剂与具有0.05-0.20重量％的配方的GPPS混合。然后通过将样品分别在70 oC，90 oC和100 oC的烘箱中暴露50小时来进行添加剂作用的研究。暴露引起的化学和机械变化之后，进行傅立叶变换红外光谱（FTIR），熔体流动指数（MFI），拉伸试验，TGA和DSC。通过使用扫描电子显微镜（SEM）观察到降解样品的表面形态。 FTIR结果表明羰基化合物对硬脂酸钴的变化最大，为1756.8-1800 cm-1。 1756.8 cm-1谱带周围的吸收可以归因于C = O官能团的拉伸，强度增加且显着变宽，表明存在最有效的氧化产物硬脂酸钴。发现在硬脂酸金属存在下的热氧化降解是，在90℃的空气暴露下，所有有效的添加剂根据钴＞铜＞铁的以下排列为0.2重量％。

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    Awang Nuha;

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