表面接枝技术对纤维加强树脂基桩力学性能的影响

目的探讨石英纤维表面接枝技术对纤维增强光固化树脂复合材料(FRC)桩力学性能的影响。方法将石英纤维随机分成5组分别进行以下表面处理:A组,10%H_2O_2浸泡20 min;B组,10%H_2O_2浸泡20 min+γ-MPS处理;C组,10%H_2O_2浸泡20 min+γ-MPS处理+Bis-GMA接枝1 h;D组,10%H_2O_2浸泡20 min+γ-MPS处理+Bis-GMA接枝3 h;E组,10%H_2O_2浸泡20min+γ-MPS处理+Bis-GMA接枝7 h。将处理好的石英纤维按相同体积比浸入光固化树脂基质中制成纤维增强树脂桩。测试试样的弯曲模量、弯曲强度、弯曲载荷,SEM观察断面的显微结构。结果不同接枝时间的石英纤维对FRC桩的力学性能有影响,其中E组力学性能明显提高,弯曲模量(24.65±2.20)GPa,弯曲强度(696.24±12.85)MPa,弯曲载荷(185.67±3.43)N,与其余组有显著差异(P<0.05)。结论纤维表面接枝技术能提高树脂基纤维桩材料的力学性能。

Effect of surface graft polymerization to quartz fibers on mechanical properties of dental FRC posts

Objective To investigate the effect of surface graft polymerization to quartz fibers on mechanical properties of quartz fiber reinforced resin composite posts. Methods Quartz fibers were manufactured and randomly divided into 5 groups for different surface treatments. Group A:10% H2 O2 immersion for 20 min; Group B: 10% H2 O2 immersion for 20 min+silanization of quartz fibers (γ?MPS);GroupC:10% H2O2immersion for 20 min+γ?MPS+grafting 1 h (Bis?GMA); Group D:10% H2O2immersion for 20 min+γ?MPS+grafting 3 h(Bis?GMA); Group E: 10% H2O2immersion for 20 min+γ?MPS+grafting 7 h (Bis?GMA). All groups of quartz fibers were filled into a resin matrix respectively, and they were light?cured in a special mold to prepare the FRC posts. The flexure modulus, flexure strength and fracture load of FRC specimens were measured by universal mechanical testing machine, and the fracture surface of FRC was observed by a field emission scanning electron microscope (SEM). Results The mechanical properties of FPC posts were affected by graft polymerization on surface of the fibers. Group E showed the best mechanical properties, with flexure modu?lus (24.65±2.20) GPa, flexure strength (696.24±12.85) MPa, and flexure load (185.67±3.43) N, which showed significant differ?ences compared with other groups ( P< 0.05) . Conclusion The graft polymerization of Bis?GMA on the surface of filler can improve the properties of FRC specimens.