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首页> 外文期刊>Journal of Polymers and the Environment >New Thermoplastic Vulcanizate Based on Acetoacetoxy Functionalized Natural Rubber/Polyamide 12 Blend Filled with Carbon Black
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New Thermoplastic Vulcanizate Based on Acetoacetoxy Functionalized Natural Rubber/Polyamide 12 Blend Filled with Carbon Black

机译：碳黑填充乙酰乙酰氧基官能化天然橡胶/聚酰胺12共混物的新型热塑性硫化橡胶

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Thermoplastic vulcanizates (TPVs) based on blends of natural rubber (NR) grafted with poly(acetoacetoxyethyl methacrylate), NR-g-PAAEM, and polyamide12 (PA12) were prepared by the dynamic vulcanization technique. NR-g-PAAEM was first prepared and its surface free energy was evaluated by means of contact angles. Blends of NR-g-PAAEM and PA12 were then prepared at a 60/40 blend ratio (wt%) using a dynamic vulcanization technique. The results revealed that TPVs exhibited a dispersed-phase morphology. However, the TPVs filled with carbon black (CB) showed much smaller dispersed rubber particles when compared to the unfilled TPV. TEM analysis also revealed that the CB appeared to be mainly located within the NR-g-PAAEM phase. The presence of CB generally raised the melt viscosity and increased shear during melt-mixing, resulting in finer dispersion of the rubber particles. Additionally, a significant enhancement in the tensile properties of the TPV was also achieved by the incorporation of CB. The optimum tensile properties were attained by the addition 30 phr of CB. The results also showed that the incorporation of CB into the NR-g-PAAEM/PA12 TPVs improved their stress relaxation properties. Moreover, the effects of reprocessing on the mechanical properties of the TPV filled with CB were also investigated. Although the TPV filled with CB exhibited reprocessing capability, reprocessing at high temperature and shear forces was found to negatively affect its tensile properties, especially after the third reprocessing cycle.
机译：通过动态硫化技术，制备了基于天然橡胶（NR）与聚甲基丙烯酸乙酰乙酰氧乙酯，NR-g-PAAEM和聚酰胺12（PA12）接枝的共混物的热塑性硫化橡胶（TPV）。首先制备NR-g-PAAEM，并通过接触角评估其表面自由能。然后使用动态硫化技术以60/40的混合比（wt％）制备NR-g-PAAEM和PA12的混合物。结果表明，TPVs表现出分散相形态。但是，与未填充的TPV相比，填充有炭黑（CB）的TPV分散的橡胶颗粒要小得多。 TEM分析还表明，CB似乎主要位于NR-g-PAAEM相中。 CB的存在通常会提高熔体粘度，并增加熔体混合过程中的剪切力，从而导致橡胶颗粒的分散性更好。另外，通过掺入CB，也实现了TPV拉伸性能的显着提高。通过添加30 phr的CB，可以获得最佳的拉伸性能。结果还表明，将CB掺入NR-g-PAAEM / PA12 TPV中可改善其应力松弛性能。此外，还研究了后处理对填充CB的TPV力学性能的影响。尽管填充有CB的TPV表现出后处理能力，但发现高温和剪切力对其后处理性能产生负面影响，尤其是在第三个后处理循环之后。

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