摘要
在十二烷基苯磺酸存在下,用原位乳液聚合技术聚合苯胺,制得了聚苯胺和磺化乙丙橡胶(EPDM)锌离聚体复合物,EPDM锌离聚体由EPDM磺化及中和制得。用磺化度分别为0.10,0.24,0.40mmol/g的EPDM锌离聚体作为基质制备出各自的复合物,复合物可以熔融热塑加工,其电导率呈现的渗滤阈值为13%。在聚苯胺质量分数相同的情况下,磺化度小的复合物的电导率高于磺化度大的复合物。当磺化度为0.10mmol/g、聚苯胺质量分数为6%～11%和磺化度为0.24mmol/g、聚苯胺质量分数为2%～11%时,复合物表现出热塑性弹性体的行为,扯断伸长率达200%～500%,永久变形小于40%。用间甲酚进行二次掺杂后复合物的电导率有所提高。加入硬脂酸锌会降低复合物的电导率及力学性能。
Composites of polyaniline (PAn) and sulfornated EPDM-zinc ionomer were prepared by in-situ emulsion polymerization of aniline in the presence of sulfonated EPDM-zinc ionomer, using dodecylbenzene sulfonic acid, acting both as a surfactant and a dopant of PAn. Sulfonated EPDM-zinc ionomer was obtained by sulfonation and neutralization of EPDM. Different composites were made using sulfonated EPDM-zinc ionomers with different sulfonate content. The composites could be processed by melt method. The composites could be processed by melt method. The percolation threshold of conductivity of the composites was 13%. The effect of sulfonation degree and PAn mass fraction on conductivity and mechanical properties of the composites was studied. At the same mass fraction of PAn, the conductivity of composites with lower sulfonated mass fraction was higher than the composites with higher sulfonated mass fraction. When sulfonated degree was 0.10 and 0.24 mmol/g EPDM and PAn mass fraction was 6%-11% and 2%-11%, the composites behave liked a thermoplastic elastomer with elongation at break 200%-500% and permanent set less than 40% respectively. The conductivity of composites after secondary doping with m-cresol was higher than the original. Addition of zinc stearate as ionic plasticizer reduced both mechanical properties and conductivity.
出处
《合成橡胶工业》
EI
CAS
CSCD
北大核心
2002年第3期149-153,共5页
China Synthetic Rubber Industry
