硼酸酯改性Mg_2B_2O_(5W)/PP复合材料界面及其力学性能

Interfacial bonding and mechanical properties of boric ester-modified Mg_2B_2O_(5W)/PP composites

为了提高聚丙烯(PP)的强韧性能,采用熔融共混法分别制备了质量分数为0～15%的Mg2B2O5晶须(MBOw)和硼酸酯偶联剂(BE)改性MBOw填充PP基复合材料,测试了PP及其复合材料的拉伸、冲击性能,并通过红外光谱、接触角测试、扫描电镜分析等对复合材料界面作用机理进行了研究.结果表明:MBOw与BE之间存在化学和物理吸附层;PP与BE处理前后的MBOw之间不存在化学键合;BE改性MBOw/PP复合材料中PP与MBOw之间的粘附功和表面张力之比由BE表面处理前的8.7增至处理后的315.0,明显改善了基体中MBOw的分散性及其界面结合性能,提高了BE改性MBOw/PP复合材料的拉伸及冲击性能.

To improve the strength and toughness performance of the polypropylene （PP）, the PP composites reinforced with Mg2B2Osw（MBOw） were prepared by melt blending. The effects of coupling agent boric ester （BE） and contents of MBOw（0～15-wt% ）on tensile and impact strength of PP and composites are studied. The compatibility, hydrophilicity and morphology of impact fracture surface of MBOw/PP composites were charaeterized by Fourier transform infrared spectroscopy （FTIR） , the contact angle measurements and scanning electron microscopy （SEM） , respectively. The results show that both the chemical bonding and physically adsorbed layers exist between MBOw and BE while the chemical bonding do not exist between PP and untreated or BE-treated MBOw, the ratioof adhesion work to interfacial tension between PP and BE-treated MBOw chan- ges.from 8.7 to 315.0 between PP and untreated MBOw, which improves the binding force between PP and BE-treated MBOw, and the dispersibility of MBOw in PP significantly. The tensile and impact strengths of the BE-treated MBOw/PP composites increase apparently in comparison to that of the Composites filled with untreated MBOw.