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1、河南理工大學本科畢業(yè)論文摘要納米聚合物微球由于其特殊的結(jié)構(gòu),具有比表面積大、吸附性強、凝集作用大及表面反應(yīng)能力強等特性。它在許多領(lǐng)域有著重要的作用,例如可作為粒度標準物質(zhì)和制備膠粒晶體的原料,也可作為模板制備微膠囊及多孔材料。本文采用乳液聚合法制備出了粒度在20~50nm的聚苯乙烯(PS)膠體微球,同時考察了單體濃度,乳化劑用量,溫度等工藝條件對PS微球的粒度及單分散性的影響。研究發(fā)現(xiàn),微球平均粒徑隨單體濃度升高而增大,隨乳化劑用量的增加先增大后減小,隨溫度的升高而減小。在苯乙烯的質(zhì)量為4.025g,水的質(zhì)量為56g,過硫酸鉀的質(zhì)量為0.0305g,苯乙烯磺酸鈉的質(zhì)量為0.403g,溫度為8
2、0℃的實驗條件下成功制備出平均粒徑為42.23nm的單分散聚苯乙烯微球。同時嘗試超聲乳液聚合法制備PS微球,考察了超聲時間對PS微球的粒度的影響,研究發(fā)現(xiàn),微球平均粒徑隨超聲時間延長而增大。關(guān)鍵詞:乳液聚合;納米;單分散;聚苯乙烯微球31河南理工大學本科畢業(yè)論文AbstractThenano-polymermicrospherehaslargesurfacearea,strongadsorption,aggregation,andsurfacereactionabilityandsoonduetoitsspecialstructure.Itplaysanimportantroleinmany
3、areas,forexample,itcanbeusedasthesizestandardmaterialsandmaterialsofpreparingcolloidalcrystals,andthetemplatetopreparemicro-capsulesandporousmaterials.Themonodispersedpolystyrene(PS)colloidalmicrosphereswerepreparedbyemulsionpolymerizationandthemicrospheres’averageparticlesizeare20~50nm.Atthesameti
4、me,someconditionssuchastheconcentrationofmonomers,emulsifiercontent,temperatureandotherprocessingconditionsonmonodisperseandparticlesizeofPSmicrosphereswereinvestigated.thattheaverageparticlesizeincreasesasthemonomerconcentrationincreasess;theaverageparticlesizeincreasesatfirstandthendecreasesasthe
5、emulsifierincreases;theaverageparticlesizedecreasesasthetemperaturerises.Theaverageparticlesizeof42.23nmmonodispersepolystyrenemicrosphereswassuccessfullypreparedintheexperimentalconditions:thequalityofstyreneis4.025g,thequalityofwateris56g,thequalityofThequalityofpotassiumpersulfate)is0.0305g,theq
6、ualityofStyrenesulfonateis0.403gandthetemperatureis80℃.AtthesametimewetrytouseultrasonicdispersionmethodtopreparesmallparticlesizeofPSmicrospheres,andinvestigatetheimpactofultrasonictimeonthePSmicrosphereparticlesize,wefoundthataverageparticlesizeincreaseswhenweprolongtheultrasonictime.Keywords:emu
7、lsionpolymerization;nm;monodispersed;polystyrenemicrospheres31河南理工大學本科畢業(yè)論文目錄摘要IAbstractII第1章緒論1第2章國內(nèi)外文獻綜述22.1聚合物微球的制備方法22.1.1分散聚合22.1.2乳液聚合62.1.3超聲輻射乳液聚合82.1.4種子乳液聚合102.1.5核殼乳液聚合102.1.6無皂乳液聚合112.1.7微乳聚合122.