改性淀粉类内养护剂的合成及性能研究
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摘要
采用玉米支链淀粉为主链,引入含有酰胺基团和磺酸基团的单体,在水溶液中聚合成一种新型改性淀粉类内养护剂(简称MC-ICA)。利用FITR、XRD、SEM和TG等表征MC-ICA的组成、结构和热稳定性能。分析表明:接枝聚合形成的MC-ICA中O-H、C-O间形成大量氢键,亲水性高;是一种非晶态、热稳定性好的共聚物。MC-ICA的吸水率较高,尤其是在近似水泥浆体孔溶液体系的吸水率是市售内养护剂的2倍。
A new type of modified corn starch internal curing agent(for short MC-ICA) was synthesized using aqueous polymerization method,which selects corn branched starch as the main chain,amide-group and sulfonic acid group as co-monomers.The molecular composition,structure and thermal stability of MC-ICA were characterized by Fourier transform infrared spectroscopy,X-ray diffraction,Scanning electron microscopy and thermal gravimetric.The results indicated that the a large number of hydrogen bonds are formed between O-Hand C-O in MC-ICA,which is an amorphous copolymer with high hydrophilicity and good thermal stability.MC-ICA has a high water absorption rate,especially in the slurry pore solution system which is similar to cement body,the water absorption rate is twice that of the market curing agent.
A new type of modified corn starch internal curing agent(for short MC-ICA) was synthesized using aqueous polymerization method,which selects corn branched starch as the main chain,amide-group and sulfonic acid group as co-monomers.The molecular composition,structure and thermal stability of MC-ICA were characterized by Fourier transform infrared spectroscopy,X-ray diffraction,Scanning electron microscopy and thermal gravimetric.The results indicated that the a large number of hydrogen bonds are formed between O-Hand C-O in MC-ICA,which is an amorphous copolymer with high hydrophilicity and good thermal stability.MC-ICA has a high water absorption rate,especially in the slurry pore solution system which is similar to cement body,the water absorption rate is twice that of the market curing agent.
引文
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[11] 赵永青,何小维,黄强,等.淀粉颗粒的结晶性及非晶化方法[J].现代化工,2007,27(11):67-69.
[12] 孙慧,林建明,唐群委,等.聚丙烯酸盐/淀粉半互穿网络水凝胶的两步水溶液合成及性能表征[J].华侨大学学报(自然版),2009,30(1):45-52.
[13] 周爱军,付艳梅,彭旭,等.丙烯酸系四元共聚耐盐性高吸水树脂的合成[J].武汉工程大学学报,2012,34(5):1-4.
[14] KLEMM A J,BAKER P,SIKORA K.The effect of super absorbent polymers on the performance of immature cementitious mortars [J].Brittle Matrix Compos,2012,10:21-31.
[2] 马先伟,张家科,刘剑辉.高性能水泥基材料内养护剂用高吸水树脂的研究进展[J].硅酸盐学报,2015,43(8):1099-1110.
[3] 杨鲁,李化建,杨长辉,等.高吸水树脂基内养护混凝土研究进展[J].材料导报,2011(s2):459-461.
[4] Craeye B,Geirnaert M,Schutter G D.Super absorbing polymers as an internal curing agent for mitigation of early-age cracking of high-performance concrete bridge decks[J].Construction & Building Materials,2011,25(1):1-13.
[5] JENSEN O M,HANSEN P F.Water-entrained cement-based materials I.Principles and theoretical background [J].Cem Concr Res,2001,31:647-654.
[6] Yuanchun Mu ,Dayan Du ,Ruicheng Yang,et al.Preparation and performance of poly(acrylic acid-methacrylic acid)/montmorillonite microporous superabsorbent nanocomposite[J].Materials Letters,2015,142:94-96.
[7] Liu Rongjin,Sun Zhihui,Ding Qingjun,et al.Mitigation of early-age cracking of concrete based on a new gel-type superabsorbent polymer[J].Journal of Materials in Civil Engineering,2017,29(10).04017151.
[8] 朱长华,李享涛,王保江,等.内养护补偿收缩混凝土的抗裂性能[J].建筑材料学报,2015,18(6):1033-1037.
[9] Page C L,Vennesland F.Pore solution composition and chloride binding capacity of silica-fume cement pastes[J] Materials.Construction,1983,91(16):19-25.
[10] 中华人民共和国住房和城乡建设部.GB/T 50082,普通混凝土长期性能和耐久性能试验方法[S].北京:中国建筑工业出版社,2009.
[11] 赵永青,何小维,黄强,等.淀粉颗粒的结晶性及非晶化方法[J].现代化工,2007,27(11):67-69.
[12] 孙慧,林建明,唐群委,等.聚丙烯酸盐/淀粉半互穿网络水凝胶的两步水溶液合成及性能表征[J].华侨大学学报(自然版),2009,30(1):45-52.
[13] 周爱军,付艳梅,彭旭,等.丙烯酸系四元共聚耐盐性高吸水树脂的合成[J].武汉工程大学学报,2012,34(5):1-4.
[14] KLEMM A J,BAKER P,SIKORA K.The effect of super absorbent polymers on the performance of immature cementitious mortars [J].Brittle Matrix Compos,2012,10:21-31.