有机蒙脱石对DAP基单向玻璃纤维层合板力学性能的影响

Effect of organo-montmorillonite on the mechanical properties of DAP based unidirectional glass fiber laminates

摘要:

分别用有机蒙脱石DK2和MHAB-MMT改性邻苯二甲酸二烯丙酯/玻璃纤维（DAP/GF）层合板，通过X射线衍射仪分析、透射电子显微镜（TEM ）等测试方法对它们在DAP基体中的分散状况，及对层合板纵向弯曲性能及层间剪切强度（ILSS）的影响进行了研究．结果表明，两种有机蒙脱石均以插层形式分散于基体中，且MHAB-MMT在基体中分散更均匀，层间距与有机蒙脱石含量的关系不大．有机蒙脱石改性剂对层合板的纵向弯曲性能影响不大，而对层间剪切强度有较大影响：用不含可聚合基团的DK2改性层合板时，ILSS没有明显增加；而用含可聚合基团的MHAB-MMT改性层合板时，添加3，～5，可使ILSS增加14．8，．合理选择改性蒙脱石的表面活性剂，对增强复合材料层合板层间性能具有重要作用．

Abstract:

Diallyl phthalate/glass fiber laminates were modified using organo-montmorillonite DK2 and MHAB-MMT ,respectively .The dispersion of organo-montmorillonite in DAP matrix was studied and their effect on the longitudinal flexural properties and inter-laminar shear strength of composite laminates were investigated .X-ray diffraction results show that both organo-montmorillonites are intercalated in ma-trix ,with the basal spacing independent of the organo-montmorillonite loading .Transmission electron mi-croscopy images indicate that both organo-montmorillonites form an intercalated structure ,with M HAB-MMT dispersed more homogeneously in DAP matrix .The mechanical testing results show that organo-montmorillonite has little effect on the longitudinal flexural properties of composite laminates and a great influence on the inter-laminar shear strength (ILSS) .The ILSS of composite laminates is found no signifi-cant increase when adding DK2 containing unpolymerizable group ,while the ILSS increases by 14 .8，when adding MHAB-MMT containing polymerizable group ,indicating that resonable choice of surfactants of organo-modified montmorillonte to improve the interlaminar properties of montmorillonte modified com-posite laminates is important .