核-壳式纳米Al<sub>2</sub>O<sub>3</sub> / PS 复合粒子改性聚苯乙烯的选区激光烧结实验研究

核-壳式纳米Al₂O₃ / PS 复合粒子改性聚苯乙烯的选区激光烧结实验研究

摘要: 针对纳米粒子易团聚的特点, 利用乳液聚合方法制备纳米Al₂O₃ / PS 复合粒子。用TEM、FTIR 对复合粒子结构进行了表征。结果表明, 所制备的复合粒子具备以纳米氧化铝为核、以聚苯乙烯为壳的核2壳式结构, 而且包覆层厚度大约为10～20 nm。用复合粒子改性选区激光烧结制备聚苯乙烯基纳米复合材料, 通过SEM 和FE2SEM 研究纳米复合材料烧结体的显微结构, 发现纳米粒子较好地分散在聚合物基体中, 且纳米氧化铝与聚合物基体之间的界面相容性和粘结性较好, 烧结体结构较致密。

Abstract: In order to prevent nano-particle aggregating , the nano-Al₂O₃ particle was covered with PS by emulsionpolymerization. The st ructure of the emulsion polymeric Al₂O₃ / PS composite particle was characterized by TEMand FTIR. The result s indicate that the Al₂O₃ / PS composite particles take an approximate ball shape and the particle consist s of centered core (Al₂O₃ ) and outer shell ( PS) , and the shell thickness is about 10～20nm. The st ructureof polystyrene modified by Al₂O₃ / PS composite particles af ter SLS was studied by SEM and FE-SEM , respectively.It is found that the nano2particles disperse in the mat rix well , and the interfacial compatibility and adhesion propertyare improved , and the density of the sintering body is increased.