SBS/蒙脱土纳米复合材料插层结构影响因素和力学性能

Factors affecting on intercalated structure and mechanical properties of poly(styrene-b-butadiene) copolymer/montmorillonite nanocomposites

为提高苯乙烯-丁二烯共聚物(SBS)的性能,采用溶液混合方法制备了SBS/有机蒙脱土(OMMT)纳米复合材料(NC).对影响NC插层结构的因素:混合条件、OMMT种类和含量、线型和星型结构SBS等进行了研究.XRD测试结果表明:存在一最佳混合时间和最佳OMMT含量;SBS在不同种类OMMT中插层效果明显不同,星型SBS更容易插层,制备的NC具有插层型结构.力学性能研究表明,添加OMMT对于所有复合材料均产生增强效果,其中以SBS4303/OMMT-DK1B NC最为明显,拉伸强度提高1倍多,并且断裂伸长率显著增加.表明OMMT具有增强和提高SBS弹性的双重作用.应力-应变曲线、300%定伸强度均从不同角度证实了OMMT的增强效果,但SBS/OMMT NC永久变形增大.

Star-shaped and linear block thermoplastic poly（styrene-b-butadiene） copolymer （SBS）/organophilic montmorillonite （OMMT） nanocomposites were prepared by a solution approach. The effects of the mixing condition, OMMT kind and content, and SBS with star-shaped and linear structure on the intercalated structure and the mechanical properties of these nanocomposites were investigated. The results from X, ray diffraction （XRD） show that the suitable mixing time and the OMMT content are obtained; the starshaped SBS is much more easily intercalated into the OMMT gallery compared with linear SBS; SBS chains are well intercalated into the OMMT galleries and an intercalated nanocomposite is obtained as well. The addition of OMMT gives a reinforcing effect for all nanocomposites, in particular, the value of the tensile strength of SBS 4303/OMMT-DK1B nanocomposites significantly increases by 2 times compared with SBS. The increase of elongation for all nanocomposites indicates that elasticity of SBS is increased as well. 300 % strength and the stress-strain curves also indicate the reinforcing effect of OMMT; however, SBS/OMMT nanocomposites have the bigger permanent deformation.