二烯丙基双酚A醚接枝聚乙烯增容聚碳酸酯/聚乙烯合金中的纤维化增韧现象

PHENOMENON OF FIBRE FORMATION BASED TOUGHENING IN PC/PE ALLOY COMPATIBILIZED WITH DIALLYL BISPHENOL A ETHER GRAFTED POLYETHYLENE

采用二烯丙基双酚A醚 (DBAE)接枝聚乙烯 (DBAE g PE)作为聚碳酸酯 (PC) /聚乙烯 (PE)合金的增容剂 ,通过测试合金的冲击强度和裂纹扩展功 (G1C)发现 ,PC含量约为 15份时 ,被增容的合金出现超常的增韧现象 .对合金的断裂表面形态用扫描电子显微镜 (SEM )观察发现 ,未增容的合金呈典型的脆性断裂 ,增容的合金在PC为 15份时 ,PC出现明显的塑性变形 ,形成纤维 .本文就此提出纤维化增韧机制 ,并结合结构模型用纤维化增韧机制初步解释了PC/PE合金的超常增韧现象 .

The present article delt with empolying o, o'-diallyl bisphenol A ether (DBAE) grafted polyethylene (DBAE-g-PE) as a compatibilizer to improve the compatibility of the polycarbonate/polyethylene alloy. An amazing toughening phenomenon was observed in the alloy containing 15phr PC and 5phr DBAE-g-PE through testing the impact strength and the critical strain energy release rate( Glc) The results from the fracture surfaces of the polycarbonate/polyethylene alloy observed by a scanning electron microscope (SEM) indicate that the neat alloy without compatibilizer displayed a brittle fracture morphology, while for the alloy compatiblized with DBAE-g-PE,both matrix and dispersed phase had high surfacial contact, and the dispersed polycarbonate particles were plastically deformed into fibres, which was brought out beacause of the impact compressure exerted by the PE matrix in the process of impacting and the excellent compatible effect between PC and PE caused by the dompatibilizer, DBAE-g-PE, A fibre formation based toughening mechanism was presented,combined with a structural diagram, to analysize the amazing toughening phenomenon in the compatibilized polycarbonate/polyethylene alloy.