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首页> 外文期刊>Journal of Applied Polymer Science >Morphology and mechanical properties of natural rubber and styrene-grafted natural rubber latex compounds
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Morphology and mechanical properties of natural rubber and styrene-grafted natural rubber latex compounds

机译：天然橡胶和苯乙烯接枝的天然橡胶胶乳混合物的形貌和力学性能

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The mechanical properties of natural rubber latex (NRL) modified with styrene-grafted natural rubber (styrene-GNR) latex were investigated. Styrene-GNR was first synthesized via emulsion copolymerization using cumene hydroperoxide/tetraethylene pentamine as an initiator. The styrene-GNR latex produced was mixed with NRL with various latex compounding contents and then prevulcanization was carried out. The mechanical properties and heat, weathering, and ozone resistance of the natural rubber (NR) and styrene-GNR latex compounds were investigated as a function of the grafted NR content. The results indicated that the tensile and tear strength were decreased, whereas Young's modulus and hardness were increased at high content of styrene-GNR. Addition of styrene-GNR improved the resistance of the compounds to heat and weathering ageing. The ozone resistance of the compound containing styrene-GNR is superior to that of the NR-rich compound. The results indicated that NR/styrene-GNR latex compounds maintained good antiageing properties required for outdoor applications. The tensile fracture surface examined by scanning electron microscopy confirmed a shift from ductility failure to brittle with an increase of the styrene-GNR content in the compounds. (C) 2008 Wiley Periodicals, Inc.
机译：研究了用苯乙烯接枝的天然橡胶（苯乙烯-GNR）改性的天然橡胶（NRL）的力学性能。苯乙烯-GNR首先通过使用氢过氧化枯烯/四亚乙基五胺作为引发剂的乳液共聚合成。将生产的苯乙烯-GNR胶乳与各种胶乳配合量的NRL混合，然后进行预硫化。研究了天然橡胶（NR）和苯乙烯-GNR胶乳化合物的机械性能，耐热性，耐候性和耐臭氧性，它们是接枝NR含量的函数。结果表明，苯乙烯-GNR含量高时，拉伸强度和撕裂强度降低，而杨氏模量和硬度提高。苯乙烯-GNR的添加改善了化合物对热和风化老化的抵抗力。含有苯乙烯-GNR的化合物的耐臭氧性优于富含NR的化合物。结果表明，NR /苯乙烯-GNR胶乳化合物保持了户外应用所需的良好抗老化性能。通过扫描电子显微镜检查的拉伸断裂表面证实，随着化合物中苯乙烯-GNR含量的增加，从延展性破坏转变为脆性。 （C）2008 Wiley期刊公司

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