作　　者： ; ; ; ; ; (汪昌秀）;

机构地区： 北京化工大学材料科学与工程学院北京市新型高分子材料制备与加工重点实验室

出　　处： 《特种橡胶制品》 2005年第4期1-5,共5页

摘　　要： 比较了用熔体法制备的有机累托石(OR)/丁苯橡胶(SBR)以及有机累托石(OR)/天然橡胶(NR)2种纳米复合材料的结构与性能。TEM和XRD对材料的分析显示,由于橡胶基体的性质差异,OR/SBR为典型的插层型结构,而OR/NR为插层型和部分剥离型混合结构。应力应变行为的研究表明,随着OR用量的增加,OR/SBR的拉伸强度和拉断伸长率均增大,这主要是分子链滑移和填料的取向造成的。对于拉伸结晶型橡胶NR,由于部分剥离型填料的增强作用,NR的定伸应力随填料用量的增加而逐渐提高。由于对结晶的阻碍作用,当OR用量为20份时,OR/NR的拉伸强度有所降低。纳米累托石的加入可以显著提高SBR和NR的硬度和撕裂强度。热失重分析表明,OR/橡胶纳米复合材料与相应的纯橡胶相比,热稳定性提高,在NR体系中更为显著。 Two rubber-based nanocomposites, natural rubber （NR） and styrene-butadiene rubber （SBR） matrixes, were prepared with organic rectorite（OR） by melt blending. X-ray diffraction（XRD） revealed that the OR/SBR nanocomposites exhibited a well-ordered intercalated structure; in the case of the NR/OR nanocomposite, it exhibited an intermediate intercalated and partial exfoliated structure. These results were in well agreement with transmission electron microscopy （TEM） observations. The tensile strength and the elongation at break of OR/SBR increased with the OR mass fraction increasing. For the strain-induced crystallization NR, the partial exfoliated OR efficiently improved the modulus of NR/OR nanocomposite, and however, its hindrance on NR crystallization during the tensile process might be the main reason for the decrease in tensile strength of OR/NR loading 20phr. The introduction of OR into SBR and NR enhanced their hardness and tear strength. TG analysis displayed the thermal stability of OR/SBR and OR/NR nanocomposites were enhanced in comparison with that of the corresponding pure rubber, especially in the NR matrix.

关 键 词： 累托石 橡胶 纳米复合材料 熔体法 应力应变 热稳定性

领　　域： [化学工程]