聚氨酯系中空纖維膜后處理研究.pdf

1、天津工業(yè)大學碩士學位論文聚氨酯系中空纖維膜后處理研究姓名：劉海亮申請學位級別：碩士專業(yè)：材料科學與工程指導教師：肖長發(fā)201112ABSTRACTPolyurethane(PU)basedhollowfibermembran爸、Ⅳerepreparedbymeltspinningmethodi11misarticleTheinfluenceofpost打ea餉entont11estlmctureandpe響咖anceswereinVes

2、tigatcdThePUbasedhollow肋ermembmewere仃eatedint、)l，omedia，甜1dthes饑lctureandperflomanceswerecontroledbychangingthepost—dIawing，hot_1艙a咖enttemperaturesandhot一吮atmenttimesundertensionThentheinnuencesofpost一仃eatmentontllepress

3、ure—responsiVebchaViorofPUbasedhollowfibermemb啪eswere咖diedFinallythePUbasedhollowfibermembmethattreated證thebestpost一廿eatmentconditionswereappliedto骶atdyewastewaterThiscanproVidefoundationont11euseofPUbasedhollowfmermembm

4、neWhenmetre咖entmediawaswater，with也e訪creasingofho卜仃l：a餉enttemperature，themembraneporesizeshrunk，thepurewaterflux(PWF)increased鋤dthencIecreasedThebestPWFwasobtainedwhenthehoIlow丘bermembraneswere臼巳atedat50℃W妯theincreasingof

5、hot一缸ea缸Ilenttimes，t11edefo咖ationrecoveD，枷oofmembranefirStdiminishedquicl(】y，t11engraduallysloweddownneP岍firStincreasedthenachieVedstabilityTheminimumhot—treatmenttimewas30millWiththeincreaSingintheoreticaldrawratio，them

6、embr鋤epores娩eofi皿ersurfaceenlarged111ePWEmcbre描ng妣n砷腿dthciIlitialmodulusincreasedMeanwhile，theextensionratio2waSadopted嬲theoptinlal妣tchingcond“ion111epressureresponsiVebehaviorwasmoreaccuratewhenthet11eoreticaldra_wratio

7、wausimpr0Ved，也ehot—watertemperaturewasreduced鋤dthehot一仃eatmenttimewasshortenedW11enthe仃eannentmediawasair，withthe訪creasingofhot一廿e咖enttempe咖rc，theelongationatbreakdecreased、Ⅳhilemebreakings缸en垂halldmeinitialmodulusincrea

8、sedWiththeincreasingofhot_骶atInenttiIlles，thePWFfirStincreased山enachieVedstabili鑼Theminimumhot仃eatmenttimewas30minWithmeincreasinginmeoreticaldra、Ⅳratio，themembraneporesizeofirulersurfaceenlarged，thePWFmcreasedandthendec

9、reasedTheelongationatbreakdecreasedwhilethebreakingstrengthandmeinitiaImoduIusiIlcreaSedTheeXtensionratio2wasadoptedastheoptimals仃etchingconditionThebestPWFwasobtailledwhenthe缸eatedtemperaturewas70℃Thedefbmlation—recoVe可