低分子量聚丙烯酸铵的制备及应用

:2007-06-25:(1974-),,,,,.:1004-4639(2008)03-0234-04,,,(,110142):采用丙烯酸为单体,过硫酸铵作引发剂,亚硫酸氢钠作链转移剂,制备分子量范围为3000~5000的聚丙烯酸铵.研究引发剂质量分数反应温度和单体质量分数等对聚合物分子量的影响.探索合成低分子量聚丙烯酸铵的最佳工艺参数:引发剂质量分数05%(占单体),单体质量分数为35%(占体系),聚合温度60,聚合时间为3~4h;并把合成的低分子量聚丙烯酸铵用作氯氧镁水泥的减水剂,结果表明,分子量为4200的聚丙烯酸铵的用量为08%时,达到了最佳减水效果.:;;;:TQ3324:A,[1-7].,(1000~5000);(104~106);[2].,,.,,.B,,;,,,,,.2080,30%,90~120min,,.,,.:08%,,,.111:,;:,;:,.12250mL,,,60,2,,05h223Vol.22No.32008.9JOURNALOFSHENYANGINSTITUTEOFCHEMICALTECHNOLOGYSep.2008,15h,pH7~8,.,,,.13131:120,.:=(/)100%.132,[3].1334,.22121135%(),25%(),60,3~4h,,1.1,,,,.01%16%,130015000,3000~5000,05%.1212,()35%,()05%,()25%,3~4h,,2.22.,,.4565,26004500.213()05%,()25%,60,3~4h,,,3.3:,,.25%45%,32505250.3,:235322221,4.44,,,4200.222(4200),(5).5,,,08%,.,.533000~5000:()35%,()05%,60,3~4h.4200,08%,,.:[1],,.[J].,2004,23(8):10-12.[2],,.[J].,1999,16(5):43-44.[3],,,.[M].:,2000:185-189.[4].[J].,2005,28(3):21-22.[5],,,.[J].,2002,24(5):217-219.[6].[J].,2000,29(1):29-30.[7],,.[J].,2003,33(1):36-39.[8],,,.[J].(),2005,28(4):389-391.2362008SynthesisofLowmolecularWeightPolyacrylicAcidAmmoniumandApplicationZHANGWenzheng,HANXue,LIUYunxuan,RENZi(ShenyangInstituteofChemicalTechnology,Shenyang110142,China)Abstract:Inthispaper,Polyacrylicacidammoniumofthemolecularweightrangefrom3000to5000wassynthesizedofPolyacrylicacidammoniumwasontheconditionofacrylicacidasmonomer,ammoniapersulfateasinitiatorandsodiumsulfiteaschaintransferagent.Theeffectsofamountofinitiator,monomerandreactiontemperatureonthemolecularweightwerestudied.Itgottheoptimaltechnologicalparameters:35%monomer,05%initiator,temperature60,polymerizationtime3~4h.Meanwhile,thelowmolecularweightpolyacrylicacidammoniumwasusedasthesuperplasticizerofmagnesiumoxychloridecement.Theresultwasshownthatpolyacrylicacidammoniumwhosemolecularweightwas4200achievedtheoptimalwaterreducingeffectwhentheamountofpolyacrylicacidammoniumwas08%.Keywords:polyacrylicacidammonium;lowmolecularweight;thewaterreducingagentmagnesiumoxychloridecement(233)[6],,,./PTC[J].,1996,9(3):329-336.[7],,./PTC[J].,2001,34(3):54-58.[8],,,.PTC[J].,2004,16(5):5-8.Nylon12/CarbonBlackCompositewithHighPTCTransitionTemperatureLIURuiqiong,LIULan,NAWei,HEXiujuan,YangMing(ShenyangInstituteofChemicalTechnology,Shenyang110142,China)Abstract:Usingnylon12(PA12)asbasedmaterialandcarbonblack(CB)asconductivefillermaterial,PTCconductivecompositewithhightranslationtemperaturewasstudied.PA12/CBcompositeswerepreparedbymeltmixing.TheinfluenceofCBgrade,CBcontentheattreatmentandCBsurfacemodificationonthePTCpropertiesofthePA12/CBcompositeswasstudied.Theresultsshowedthat:PTCwasfilledwith30%Vxc305CBanditsintensityofPA12/CBcompositereached105;NTCeffectdisappearedwhenCBcontentwereat40%~50%;TheheattreatmentofPA12/CBwasenhancedthePTCeffectaftersurfacemodificationofCB,andtheNTCeffectofthecompositeswasabletodepress.Keywords:nylon12;carbonblack;PTCeffect;NTCeffect;heattreatment3,:237