明胶中α组分含量对明胶/羟基磷灰石复合材料力学性能的影响

选用α组分含量分别为20.5%,41%和50%的A、B、C 3种明胶作为原料,采用同时加入法制备了明胶/羟基磷灰石(HAP)复合材料.通过对干态复合物膜拉伸性能的测试和对比,发现,明胶α组分含量的变化对复合材料的弹性模量影响较大,而对拉伸强度和断裂伸长率的影响则相对较小,但总的来说,三者均随α组分含量的增加而增大.其中,α组分含量最高的复合物C的拉伸强度为86.40 MPa,弹性模量为2682.35 MPa,断裂伸长率为8.65%.另外,对复合物C基本性质的表征结果表明,该材料具有类似于自然骨的组成和结构性质,因此有望成为一种具有优异力学性能的骨替代材料.

EFFECTS OF α COMPONENT CONTENT OF GELATINS ON MECHANICAL PROPERTIES OF GELATIN/HYDROXYAPATITE COMPOSITES

Three gelatins with α component content 20.5%,41% and 50%,respectively,were used as raw materials for the preparation of gelatin/hydroxyapatite composites by simultaneous titration method,and then the tensile properties for dry films of the three composites,including tensile strength,Young's modulus and elongation at break,were measured and compared.The results showed that all of the three tensile parameters increased with increasing the α component content of gelatins.Among them,the Young's modulus of composites was more sensitive to the α component content of gelatins.The mechanical properties of composite C with the highest α component content were shown as follows:86.40 MPa of tensile strength,2682.35 MPa of Young's modulus and 8.65% of elongation at break.In addition,the characterization results of basic properties of composite C revealed that this material had the composition and structure similar to those of natural bones,and therefore was promising to be a good candidate for bone substitute materials.