中文摘要：

研究了1种有机协效阻燃剂（OSF）表面功能化可膨胀石墨（EG）及其在阻燃聚丙烯（PP）中的应用。通过红外光谱（FT-IR）、扫描电镜（SEM）、极限氧指数（LOI）、UL-94垂直燃烧、热失重分析（TG）和差示扫描量热（DSC）等表征方法对EG的功能化效果、阻燃PP复合材料的阻燃性能、热稳定性、结晶行为与力学性能进行了研究。结果表明OSF成功地接枝到了EG表面。改性后的EG是1种有效的阻燃剂,能显著提高PP的阻燃性能,其阻燃性能达UL-94V0级。改性EG的加入,PP的热稳定性得到改善,高温时的残炭量增加。改性EG对PP有异相成核作用,PP结晶温度向高温方向偏移。阻燃剂的加入劣化了PP的力学性能,且随着其含量的增加而逐渐降低。

英文摘要：

In this work,expandable graphite（EG）,functionalized by using organic synergistic flame retardant（OSF）,as a flame retardant,was filled into polypropylene（PP）composites.The structure and morphology of the modification EG（MEG）particles were characterized by FTIR and SEM.The results showed that the OSF was grafted into the surface of EG,and the layer structure of EG was complete.The influences of MEG on the flammability,thermal stability,crystallization,and mechanical properties of PP materials were investigated and discussed by limiting oxygen index test（LOI）,UL-94 vertical flame test,TG and DSC and mechanical property tests.The results showed that MEG was an effective flame retardant.The LOI values of PP/MEG composites increased with increasing the MEG content,and the UL-94V0 rating was obtained when the content of MEG was more than 20wt% in the flame retardant PP composites due to the complete and compact intumescent charred residues on the surface of PP/MEG composites after combustion.The TG data showed that the addition of MEG improved the thermal stability and charred residues at high temperature.The MEG particles have the heterogeneous nucleation effect on PP,and the melting temperature and crystallinity of PP were affected by MEG.The data from the mechanical property test showed that the addition of MEG deteriorated the tensile strength,elongation at break,and impact strength of PP.