欢迎来到天天文库
浏览记录
ID:31248130
大小:630.02 KB
页数:8页
时间:2019-01-07
《聚醚改性聚天冬氨酸减水剂制备和其性能201803090161》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、聚醚改性聚天冬氨酸减水剂的制备及其性能201803090161于梦,王菲菲,赵彦生*(太原理工大学化学化工学院,山西太原030024)摘要:以聚琥珀酰亚胺(PSI)和端氨基聚醚(M2005)为原料,合成了聚醚改性聚天冬氨酸减水剂(PEMPASP),采用FTIR对PEMPASP进行了结构表征,考察了不同减水剂及其用量对水泥净浆流动度和胶砂强度的影响;通过对TOC、Zeta电位、XRD以及TG-DSC分析,分析了PEMPASP减水剂的作用机理。结果表明:当n(PSI):n(M2005)=1:0.14时,PEMPASP掺量为水泥质量的0.35%时,水泥的净浆流动度
2、比掺加聚天冬氨酸(PASP)的水泥净浆流动度提高了189%,在减水剂质量分数为水泥的0.25%时,水泥胶砂抗折强度比空白水泥增长了15.6%,比含有PASP的水泥胶砂增长了17%;由于在PASP分子链上引入长侧链聚醚链,改变了减水剂分子上的电荷密度和侧链结构,影响了减水剂对水泥颗粒的静电作用和位阻作用,进而改善了吸附、分散以及水泥的水化作用,提高了减水剂的综合性能。关键词:聚天冬氨酸;聚醚;减水剂;水化;流动度中图分类号:TU528.42文献识别码:ASynthesisandPropertiesofPolyether-ModifiedPoly(asparti
3、cacid)SuperplasticizerYUMeng,WANGFei-fei,ZHAOYan-sheng*(CollegeofChemistryandChemicalEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,Shanxi,China)Abstract:Polyether-modifiedpoly(asparticacid)superplasticizer(PEMPASP)wassynthesizedbyusingpolysuccinimide(PSI)andpolyetheramine
4、(M2005)asmaterialsandcharacterizedbyFTIR.Theeffectsofdifferentsuperplasticizersandtheirdosageonthefluidityandflexuralstrengthofcementpasteswerediscussed.ThemechanismofPEMPASPsuperplasticizerwasstudiedbyTOC,Zetapotential,XRDandTG-DSC.TheresultsshowedthatwhenthemolarratioofPSItoM2005
5、was1:0.14,thepreparedsuperplasticizerexhibitedgoodperformance.Thefluidityofcementpastecontaining0.35%PEMPASPwasincreasedby189%comparedwiththatofcementpastecontainingpolyasparticacid(PASP).WhenthemassfractionofthisPEMPASPwas0.25%ofcement,theflexuralstrengthofcementmortarwasincreased
6、by15.6%comparedwiththatofblankcementand17%higherthanthatofcementmortarcontainingPASP.Theintroductionoflong-chainpolyethercanchangethechargedensityandsidechainstructureofsuperplasticizer,whichaffectstheelectrostaticeffectandsterichindranceofsuperplasticizeronthecementparticles,Thus,
7、theadsorption,dispersionandthehydrationofcementareimproved,andthecomprehensiveperformanceofsuperplasticizerisimproved.Keywords:poly(asparticacid);polyether;superplasticizer;hydration;fluidityFoundationitems:NationalNaturalScienceFoundationofChina(21304066)andScientificandTechnologi
8、calProjectsinShanxiProvinc
此文档下载收益归作者所有