偶联改性纳米HAP/HDPE挤出复合生物材料的力学性能和微观结构  

Mechanical properties and microstructure of nano HAP/HDPE extrusion bio-composite modified by silane-coupling agents

作　　者：张斌[1] 朱武[2] 黄苏萍[2] 周科朝[2] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《功能材料》2007年第11期1912-1915,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2003AA302210);湖南省自然科学基金资助项目(04JJ3083);中南大学创新工程基金资助项目(030615)

摘　　要：通过化学共沉淀-水热合成法制备纳米级羟基磷灰石(HAP),再用自制模具制备出偶联剂改性纳米HAP/高密度聚乙烯(HDPE)挤出复合材料。通过SEM观察以及力学性能测试,研究了偶联剂改性纳米HAP/HDPE复合材料的微观结构和力学性能。结果表明:添加硅烷偶联剂后,HAP/HDPE复合材料的力学性能获得提高,偶联剂含量为2%(质量分数)时拉伸强度最高。而当HAP含量为20%(质量分数)时,复合材料的拉伸强度和抗弯强度最高。添加了偶联剂,HAP微粒表面与HDPE有较好的亲和性,断裂过程中应力诱发的塑性变形增加,裸露的HAP颗粒明显减少。通过口模挤出可以使得聚乙烯分子链在应力作用下伸直取向,大量平行于长轴且紧密排列的微纤维形成。Nano HAP particles were made by co-deposition and hydro-thermal synthesis,and nano HAP/ HDPE extrusion composites modified by silane-coupling agents were prepared by self-made mould. Microstructure characteristics and mechanical properties were investigated by SEM observation and mechanical properties test. It is found that after silane-coupling agents were added in the composite,mechanical properties of HAP/HDPE composite were increased,when 2wt% of silane-coupling agents were added, tensile strength of the composite was the highest. When the content of HAP was 20wt%, tensile strength and bending strength were the highest. The modified surfaces of HAP particles were friends with HDPE when the silane-coupling agents were added,plastic deformations on the surfaces of the fracture strain were obviously added, the exposed HAP particles were decreased on the fracture surfaces. C--C chain of polyethylene can be stretched by stress of extrusion, a lot of closely aligned thin fibers parallel to long axis are formed.

关 键 词：羟基磷灰石(HAP) 高密度聚乙烯(HDPE) 生物复合材料 硅烷偶联 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业] R687.3[医药卫生—骨科学]