CAJ | 학술논문

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20～45 nm,磁饱和强度为32× 10-3 A·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80～300 nm,聚乳酸的包覆率为45.5％,磁饱和强度为10.6× 10-3 A·m2,ZnFe2O4经改性聚乳酸封装后仍然保持较好的磁饱和强度.
이개진액상화학법합성철산자납미자류체래대체전통적철양화물자분,동시이D,L형병교지여병안산위단체진행본체취합,득도안기산개성취유산,재이개성취유산포봉납미자류체구건자성고분자미구.채용X사선연사、부립협홍외광보의、핵자공진의、소묘전경、투사전경、진동양품자강계、열중분석의등대소합성적재료진행표정.결과표명:소제비적재료위첨정석형적ZnFe2O4납미정,립경위20～45 nm,자포화강도위32× 10-3 A·m2;병안산성공접지도료취유산련상;철산자납미자류체/취유산복합미구적분산성교호,립경위80～300 nm,취유산적포복솔위45.5％,자포화강도위10.6× 10-3 A·m2,ZnFe2O4경개성취유산봉장후잉연보지교호적자포화강도.
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·m2,which suggests ZnFe2O4 enjoys a stable magnetization after being coated by polymer.