【摘要】 利用三种蒙脱土(即S-MMT,TG-2,OLS,统称MMT)和一种短切纤维(Short-cutGlassFiber,简记为SGF),分别与酚醛树脂熔融混合,制得酚醛树脂基复合材料。通过缺口冲击实验和弯曲实验,对这些复合材料的力学性能和增强增韧机理进行了研究,取得了一些有规律性的结果。PF/NBR/SGF复合材料的缺口冲击强度、弯曲强度和弯曲模量都随SGF含量的增加而增大;PF/NBR基蒙脱土纳米复合材料的缺口冲击强度随纳米材料(即S-MMT,TG-2和OLS)含量的增加而增大,在含量为5份时达到最大值;弯曲强度和弯曲模量也随纳米材料含量的增加而增大,在含量为9份时达到最大值。其次,所有PF/NBR基复合材料的缺口冲击强度均在60℃取得最大值,PF/NBR/OLS,PF/NBR/TG-2,PF/NBR/S-MMT等三种纳米复合材料的力学性能与体系中蒙脱土的层间距密切相关。层间距越大,力学性能越好。最后,探讨了纳米蒙脱土增强增韧PF/NBR体系的机理,指出聚合物体系中的蒙脱土具有两种效应,并建立了模型。更多还原

【Abstract】 Three kinds of montmorillonites (MMT, including SMMT,TG2,OLS) and one kind of shortcut glass fiber (SGF) were used to melt compounded with phenolic resin (PF), thus phenolic resin matrix composites were prepared Notch impacting and bending tests were used to study the mechanical properties and strengthening and toughening mechanism, through which some regular results were achieved Notch impact strength, bending modulus and strength of PF/NBR/SGF composites increase with the increase of the content of SGF For PF/NBR matrix montmorillonite nanocomposites, notch impact strength increase with the increase of the contents of the montmorillonites, when the content of montmorillonites reaches 5phr, the impact strength is the highest; and the bending modulus and bending strength also increase with the increases of the contents of the montomorillonites, and when the content is up to 9phr, the bending modulus and bending strength are the highest Through the comparison of the mechanical properties of the PF/NBR matrix composites, it showed that: when the content of the fillers and the experimental temperature is the same, the notch impact strength of PF/NBR/SGF composite is the highest, but the bending modulus and bending strength are the lowest; the notch impact strength of PF/NBR/OLS nanocomposites is the second one, but their bending modulus and bending strength are the highest; the notch impact strength of PF/NBR/TG2 nanocomposities is the third one, and their bending strength and bending modulus are the second one; the notch impact strength of PF/NBR/SMMT nanocomposities is the lowest, and the bending modulus and bending strength is the third one Secondly, for each of the PF/NBR matrix composites, when the experimental temperature is 60℃, their impact strength are the highest; when experimental temperature is higher or lower than 60℃, their impact strength lowered For PF/NBR/OLS, PF/NBR/TG2 and PF/NBR/SMMT nanocomposites, their mechanical properties have close relation with the space distances of montmorillonites, the greater the space distances of montmorillonites are, the better the mechanical properties world be When the content of montmorillonite is the same, the mechanical properties of the exfoliated nanocomposites are better than intercalated nanocomposite At last, montmorillonite′s toughening and strengthening mechanism was studied, and models illustrated in Fig10 and Fig11 are porposed更多还原