手性聚苯胺的制备及其电磁学性能研究

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1、西南交通大学硕士学位论文手性聚苯胺的制备及其电磁学性能研究姓名：黄艳申请学位级别：硕士专业：材料科学与工程指导教师：周祚万20080601西南交通大学硕士研究生学位论文第1I页胺优越的吸波性能，厚度为2mm的平板吸波有效频宽(>．5dB)达7GHz，最大电磁波衰减为．10．8dB。关键词手性聚苯胺；圆二色性；导电率；磁学性能；电磁波损耗西南交通大学硕士研究生学位论文第1II页AbstractChiralPolyaniline(PANI)isaspecialconductivepolymerandhas

2、apearedpotentialapplicationindiverseareas，suchaselectrochemicalasymmetricsynthesis，chiralchromatography,membraneseparationtechnologyandmicrowaveabsorbents，etc．Inthispaper,thechiralpolyanilinearesynthesizedbyre—dopingemeraldinebase(EB)withchiralacid．Them

3、aicrostructuresandchiralityofthesamplesarecharacterizedbymeansofFouriertransforminfrared(Fr-IR)spectra，elementanalysis，x—raydiffractor(XRD)，circulardichroismspectroscopy(CD)，ultravioletvisiblespectrophotometer(UV-vis)．TheresultsindicatethattheEBcanbeind

4、ucedbychiralcamphorsulfonicacid(CSA)withspecificelectrostaticandhydrogenbondbetweenthePANIchainsandtheenantiomericdopantCSA-anions，inspiringthePANIchainsrearrangedandpreferentiallyadoptingaone-handedhelicalSCreWtoformthechiralPANI．Theelectricalconductiv

5、ity,magneticpropertyandelectromagneticbehaviorofthesamplesareintensivelyinvestigated．TheresultsindicatethatPANIarefullydopedwithCSAandhavethemaximumchiralitywiththemaximumconductivityis0．58S／cmincasethatthemolarratiooftetramerunitofEBandCSAisapproximate

6、ly1：3．Thetestofconductivityshowsnoobviousdependenceondifferenthelicalorientation．Theas-synthesizedchiralPANIpossessesuniqueroom-temperatureferromagnetismandbehavessuperparamagnetismat50Kand100K．Themagnetizationcurvesofthesamplesapeartypicalmagnetic西南交通大

7、学硕士研究生学位论文第1V页hysteresisloopat300Kand200Kwithsaturationmagnetizationof0．031emu／gand0．032emu／g，respectively,andthecorrespondingcoercivityis70Oeand80Oe，respectively．TheabovemagneticpropertiesfoundinthechiralPANIsareattributedtothechiralhelicalconformation

8、ofthemainchain．ThischiralPANlwithoutanymetalinpurityisrecognizedasorganomagnet．ItisalsofoundthatthechiralPANIexhibitsdielectriclossat2～12GHzandmagneticlossat12～18GHz，respectively,whichismainlyarisenfromthechiralhelicalconformatio