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The Effect of Curing Parameters on the Mechanical Properties of Styrene-NR Elastomers Containing Natural Rubber-Graft-Polystyrene

机译:固化参数对含天然橡胶接枝聚苯乙烯的苯乙烯-NR弹性体力学性能的影响

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The copolymerization of styrene on natural rubber latex was prepared by an emulsion polymerization using potassium persulfate and sodium laurylsulfate as an initiator and emulsifier, respectively. The vulcanization characteristics of styrene-NR elastomers were studied using moving die rheometer. The effect of vulcanization on styrene-NR elastomer containing natural rubber-graft-polystyrene was investigated in accelerated-sulphur curing system containing 2.0, 2.5, 3.0, 3.5 phr of sulphur with various temperatures ranging from 130℃ to 160℃. Increase of tensile strength resulted from an increase of the crosslink density of vulcanization when compared to uncured sample. Furthermore, the accelerating action of temperature in curing system could be confirmed by increase of curing rate index and rate constant. The value of activation energy of the cure reaction could be calculated as 72.278 kJ/mol.
机译:苯乙烯在天然橡胶胶乳上的共聚是通过乳液聚合法制备的,分别使用过硫酸钾和十二烷基硫酸钠作为引发剂和乳化剂。使用动模流变仪研究了苯乙烯-NR弹性体的硫化特性。在130℃至160℃的不同温度下,在硫磺含量为2.0、2.5、3.0、3.5 phr的加速硫硫化体系中,研究了硫化对天然橡胶-接枝聚苯乙烯的苯乙烯-NR弹性体的影响。与未固化的样品相比,拉伸强度的提高是由于硫化交联密度的增加。此外,可以通过提高固化速率指数和速率常数来确认固化系统中温度的加速作用。固化反应的活化能值可以计算为72.278 kJ / mol。

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