三种硅橡胶的机械性能实验

Assessment of mechanical properties of three silicone elastomers

目的 :对比SY 2和MDX 4 42 10、SY 1硅橡胶的机械性能。方法 :按国家标准要求对SY 2和MDX 4 42 10、SY 1硅橡胶扯断强度、扯断伸长率、永久变形率 ( 3min)、撕裂强度、硬度 (邵氏A)进行测试 ,对其机械性能加以评价 ,并进行统计学分析。结果 :3种硅橡胶的扯断强度、永久变形率无显著差异(P >0 .0 5 ) ;SY 2的扯断伸长率、邵氏硬度均优于MDX 4 42 10硅橡胶 (P <0 .0 5 ) ;SY 1和SY 2的撕裂强度优于MDX 4 42 10硅橡胶 (P <0 .0 5 )。结论 :SY 2硅橡胶可以满足颌面软组织缺损赝复材料的机械性能要求 ,并在扯断伸长率、撕裂强度、邵氏硬度指标方面优于MDX 4 42 10。

Objective:To compare the mechanical properties of 3 widely used silicone elastomers . Methods: 5 test specimens of each of SY-2, MDX-4-4210 and SY-1 silicone elastomer were prepared respectively,then the major mechanical properties of the elastomers were tested and measured according to national standard. The properties tested were selected based on their clinical significance for fabricating a facial prosthesis. Results: The tensile strength (MPa) of SY-2,SY-1 and MDX-4-4210 was 4.0±0.32,4.0± 0.28 and 4.0±0.38 (P>0.05);the elongation (%) 470±9.5,560±8.2 and 470±5.8 (SY-1 versus SY-2 or MDX-4-4210,P<0.05);the tear strength (kN/m) 17.0±3.1,19.2±2.5 and 12.0±3.5 (SY-2 or SY-1 versus MDX-4-4210,P<0.05);the hardness 28.0±3.6,24.0±4.1 and 37.0±5.2(P<0.05),respectively.Conclusion: SY-2 silicone elastomer is suitable for the use in fabricating of clinical prostheses.