Preparation and characterization of composite microspheres of nano zinc ferrite/poly(D,L-lactide-co-alanine)  

纳米铁酸锌/丙氨酸改性聚乳酸复合磁性微球的制备和表征(英文)

作　　者：曹雷健[1] 周勤华[2] 谷俐[3] 沈红霞[3] 李清华[1] 兰平[3] 方燕[3] 

机构地区：[1]常州大学材料科学工程学院,常州213164 [2]嘉兴学院医学院,嘉兴314001 [3]嘉兴学院高分子材料研究所,嘉兴314001

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第2期360-365,共6页中国有色金属学报（英文版）

基　　金：Project (21107032) supported by the National Natural Science Foundation of China;Projects (Y406469,Y4110606) supported by Natural Science Foundation of Zhejiang Province, China;Projects (2008AY2018,2011AY1048-5,2011AY1030) supported by the Science Foundation of Jiaxing Science and Technology Bureau,China;Project (2009C21003) supported by Science and Technology Department of Zhejiang Province,China

摘　　要：Magnetic nano zinc ferrite fliuds were synthesized using an improved liquid phase chemical method, which would be used to replace tradditional iron oxides magnetic material. A novel copolymer （PLAA） with D, L-lactide （D, L-LA） and alanine was synthesized using stannous octoate as initiator. Magnetic polymer microspheres were fabricated with nano zinc ferrite fluid coated with alanine modified poly lactide. These as-prepared zinc ferrite fluids, modified poly lactide and magnetic composites, were characterized with X-ray diffraction diffractometer, FT-IR spectrometer, nuclear magnetic resonance spectrometer, scanning electron microscope, transmission electron microscope, vibrating sample magnetometer, and thermogravimetric analyzer. The results demonstrate that the as-prepared zinc ferrite is spinel type of ZnFe2O4 nano crystals with particle size of 20-45 nm and magnetization of 32×10^-3 A.m2. Alanine is copolymerized with lactide, and the prepared composite magnetic microsphere is coated with the modified polylactide, with mass fraction of 45.5% of PLA, particle size ranging from 80-300 nm, and magnetization of 10.6×10^-3 A·m^2, which suggests ZnFe2O4 enjoys a stable magnetization after being coated by polymer.以改进液相化学法合成铁酸锌纳米磁流体来代替传统的铁氧化物磁粉,同时以D,L型丙交酯与丙氨酸为单体进行本体聚合,得到氨基酸改性聚乳酸,再以改性聚乳酸包封纳米磁流体构建磁性高分子微球。采用X射线衍射、傅立叶红外光谱仪、核磁共振仪、扫描电镜、透射电镜、振动样品磁强计、热重分析仪等对所合成的材料进行表征。结果表明:所制备的材料为尖晶石型的ZnFe2O4纳米晶,粒径为20～45nm,磁饱和强度为32×10-3A.m2;丙氨酸成功接枝到了聚乳酸链上;铁酸锌纳米磁流体/聚乳酸复合微球的分散性较好,粒径为80～300nm,聚乳酸的包覆率为45.5%,磁饱和强度为10.6×10-3A.m2,ZnFe2O4经改性聚乳酸封装后仍然保持较好的磁饱和强度。

关 键 词：zinc ferrite ALANINE POLYLACTIDE magnetic composite microsphere 

分 类 号：TB383.1[一般工业技术—材料科学与工程]