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时间:2020-03-26
《嵌段聚合物修饰的金纳米粒子的制备及表征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第26卷第8期化学研究与应用V01.26.No.82014年8月ChemicalResearchandApplicationAug.,2014文章编号:1004.1656(2014)08—1237-06嵌段聚合物修饰的金纳米粒子的制备及表征翟翠萍,陈霞,李东风,高青雨(河南大学化学化工学院,河南开封475004)摘要:通过RAFr合成聚(甲基丙烯酸缩水甘油酯)_b.聚(乙二醇甲基丙烯酸酯)嵌段共聚物(PGMA-b-PMAPEG),再用半胱氨酸(Cys)使PGMA中的环氧基团开环,制备含有巯基的两亲水嵌段聚合物PM
2、APEG-b-P(GMA.Cys)。并以其作为修饰剂,通过原位还原法使HAuC1在NaBH的还原下制备金/聚合物纳米复合粒子(Au@PMAPEG—b.P(GMA.Cys)NPs)。经FI’.IR、uV—vis、TG、XRD、TEM和DIS表征,发现金纳米复合粒子呈均匀分散的球形,平均粒径约为10nm,在527nm处出现了金纳米粒子的表面等离子共振吸收峰,金约占总重量的49%。由于外层嵌段共聚物的修饰作用,金纳米复合粒子在室温下放置6个月未发生粒子间的聚集。关键词:嵌段聚合物;修饰剂;原位还原;金纳米粒子;制备中图
3、分类号:0632.52文献标志码:APreparationandcharacterizati0nofgoldnanoparticlesstabilizedbydiblockcopolymersZHAICui—ping,CHENXia,LIDong—feng,GAOQing—yu’(CollegeofChemistryandChemicalEngineering,HenanUniversity,Kaifeng,Henan,475004,China)Abstract:Thediblockcopolymerofpoly
4、(2,3-epoxypropylmethacrylateglycidylmethacrylate)-b-poly(poly(ethyleneglyco1)meth—ylethermethacrylate)(PGMA-b-PMAPEG)waspreparedbyreversibleaddition-fragmentationchaintransfer(RAFT)polymeriza—tion.Thenthiol—functionalizedpolymerPMAPEG—b·P(GMA—Cys)wassynthesiz
5、edbythereactionofcysteine(Cys)withtheepoxygroupsofPGMA.Furthermore,usingMAPEG—b—P(GMA—Cys)asamodifier,Au@PMAPEG—b-P(GMA.Cys)NPshasbeensynthe-sizedbyin·situreductionofHAuC14withsodiumborohydride(NaBH4)asareduetant.Thegoldnanocompositeparticleswerechar-acterize
6、dbyUV—visible(UV-vis),fouriertransforminfraredspectroscopy(Fr—IR),thermalgravimetrieanalysis(TGA),X-Raydif-fraction(XRD),transmissionelectronmicroscopy(TEM)anddynamiclightscattering(DIS),foundthatthegoldnanocompositeparticleswereuniformlydispersedsphericaland
7、theaveragesizeWritsabout10rim.UV-visiblespectradisplayedthatthesurfaceplasmaresonanceabsorptionpeakappearedatabout527nmforgoldnanocompositeparticles.TheTGAcurvesindicatedthatthepercentageofgoldinthegoldnanocompositeparticlesis49%.Thegoldcompositeparticlesdidn
8、otoccuraggregationbetweenparti-clesatroomtemperatureoversixmonthsbecausethemodificationoftheouterblockcopolymelt'.Keywords:blockpolymer;modefier;in—situreduction;goldnanoparticles;prepare
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