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Comparison of mechanical properties and curing characteristics of natural rubber composites with different coupling agents

机译：用不同偶联剂的天然橡胶复合材料的力学性能和固化特性的比较

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Nanosilica (NS) was recently used as a filler to improve mechanical properties, morphology behaviors of natural rubber (NR) composites and also for light colored product. NS is hard to disperse in NR composite compare to carbon black due to large number of Silanol (Si-OH) group leads to strong filler-filler interaction. Silane coupling agent was extensively used to improve reinforce efficiency of NS and also for good filler-matrix interaction by reducing Si-OH group. In this study, Bis[3-(triethoxysilyl)propyl] tetrasulfide (Si-69) and (3-aminopropy)triethoxysilane (APTES) were used as a coupling agents with various loading 1.5, 3, 4.5 phr in conventional sulphur vulcanization system. Both Si69 and APTES gave a significance of the NR compound processing. However, hardness was gradually decreased up to 4.5 phr due to plasticizing effect. Si-69 can increase crosslink density because of 4 molecular of sulphur (S) and its structure retarded the curing where APTES accelerated the cured because APTES has lower molecular weight and viscosity than Si-69.
机译：纳米二氧化硅（NS）最近被用作填料，以提高机械性能，天然橡胶（NR）的复合材料的形态行为，并且还用于光有色产物。 NS是很难在NR复合比较碳黑分散由于大量硅烷醇（的Si-OH）基团引线强填料 - 填料相互作用。硅烷偶联剂广泛地用来提高加强NS的效率，并且还通过减少Si-OH基良好填料 - 基质相互作用。在这项研究中，双[3-（三乙氧基硅基）丙基]四硫化物（SI-69）和（3-氨基丙基）三乙氧基硅烷被用作与各种装载1.5,3一个偶联剂（APTES），4.5份在常规硫硫化体系。双方的Si69和APTES给NR复合加工的意义。然而，硬度逐渐降低到4.5份由于增塑效果。的Si-69可以增加交联密度，因为4分子的硫（S）和它的结构，其中延迟APTES加速固化因为APTES具有较低的分子量和粘度除Si-69的固化。

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