The modified epoxy resin (EP) was filled with styrene-butadiene-styrene 792 (SBS792,S∶B=40∶60) and styrene-butadiene-styrene 796 (SBS796,S∶B=20∶80) respectively,and then the effects of different elastic block contents on the mechanical properties and friction and wear properties of EP were investigated.The results showed that the tensile strength and impact strength of 3wt.% SBS792/EP composite reached to 25.29MPa and 20.33kJ/m2,respectively,which increased by 137.97% and 57.17% compared with that of pure EP,respectively.The tensile strength and impact strength of 3wt.% SBS796/EP composite reached to 23.94MPa and 22.06kJ/m2,respectively,which increased by 125.26% and 70.60% compared with that of pure EP,respectively.Both EP composites changed from brittle fracture to ductile fracture.The tensile strength of SBS792/EP composites was higher than that of SBS796/EP composites,but the impact strength was lower than that of SBS796/EP composites.Therefore,the toughness of SBS796/EP composites was better than SBS792/EP composites because the addition of elastomer obviously improved the toughening effect of EP.Compared with pure EP,the tribological properties of SBS792/EP composites were slightly improved,while the tribological properties of SBS796/EP composite had significant changes.The friction coefficient and wear rate of 0.5wt.% SBS796/EP composite were the minimum of 0.47 and 0.03×10-3mm3/(N·m),which reduced by 25.12% and 21.93%,respectively,compared with pure EP,presenting better friction and wear properties.The contact angle test of SBS792/EP composite and SBS796/EP composite exhibited that SBS796 could convert hydrophilic EP to hydrophobic EP.The results showed that the mechanical properties,tribological properties and hydrophobic properties of SBS796/EP composites with large elastic block ratio were superior to those of SBS792/EP composites with small elastic block ratio.
Yang Lulu, Niu Yongping, Li Yang, Du Sanming, Yuan Zhihui
. Mechanical properties and friction and wear properties of epoxy resin modified by SBS at different block ratios[J]. New Chemical Materials, 2022
, 50(12)
: 77
-82
.
DOI: 10.19817/j.cnki.issn1006-3536.2022.12.015
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