聚醚改性聚天冬氨酸减水剂的制备及其性能201803090161

《聚醚改性聚天冬氨酸减水剂的制备及其性能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

2、量为水泥质量的0.35%时，水泥的净浆流动度比掺加聚天冬氨酸（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：ASynthesisa

3、ndPropertiesofPolyether-ModifiedPoly(asparticacid)SuperplasticizerYUMeng,WANGFei-fei,ZHAOYan-sheng*(CollegeofChemistryandChemicalEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,Shanxi,China)Abstract：Polyether-modifiedpoly(asparticacid)superplasticizer(

4、PEMPASP)wassynthesizedbyusingpolysuccinimide(PSI)andpolyetheramine(M2005)asmaterialsandcharacterizedbyFTIR.Theeffectsofdifferentsuperplasticizersandtheirdosageonthefluidityandflexuralstrengthofcementpasteswerediscussed.ThemechanismofPEMPASPsuperplasticizerwass

5、tudiedbyTOC,Zetapotential,XRDandTG-DSC.TheresultsshowedthatwhenthemolarratioofPSItoM2005was1:0.14,thepreparedsuperplasticizerexhibitedgoodperformance.Thefluidityofcementpastecontaining0.35%PEMPASPwasincreasedby189%comparedwiththatofcementpastecontainingpolyasp

6、articacid(PASP).WhenthemassfractionofthisPEMPASPwas0.25%ofcement,theflexuralstrengthofcementmortarwasincreasedby15.6%comparedwiththatofblankcementand17%higherthanthatofcementmortarcontainingPASP.Theintroductionoflong-chainpolyethercanchangethechargedensityands

7、idechainstructureofsuperplasticizer,whichaffectstheelectrostaticeffectandsterichindranceofsuperplasticizeronthecementparticles,Thus,theadsorption,dispersionandthehydrationofcementareimproved,andthecomprehensiveperformanceofsuperplasticizerisimproved.Keywords：p

8、oly(asparticacid);polyether;superplasticizer;hydration;fluidityFoundationitems:NationalNaturalScienceFoundationofChina(21304066)andScientificandTechnologicalProjectsinShanxiProvinc