不同羧基密度与功能基聚羧酸减水剂的合成及性能研究
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摘要
采用密度泛函理论从理论化学的角度，研究两种共聚单体的自由基活性差异以及结构单元间存在的结合方式等问题。运用自由基共聚合理论，通过对合成工艺条件的正交实验以及添加剂用量实验的选择，得到对水泥浆体初始分散性和分散保持性最佳的标准聚羧酸减水剂的合成条件。在标准聚羧酸减水剂的基础上，通过改变羧酸密度和引入不同功能基团得到一系列聚羧酸减水剂。采用红外光谱和凝胶色谱对合成聚羧酸减水剂结构进行表征。采用旋转粘度计等，研究掺加不同羧基密度和功能基的聚羧酸减水剂对新拌水泥浆体剪切应力、表观粘度以及其它流变特性的影响规律。借助水泥水化放热测试仪、X射线衍射仪等设备，分析掺不同羧基密度和不同功能基团的聚羧酸减水剂对新拌水泥浆体水泥水化放热速率和放热量、水泥水化产物以及早期抗压强度的影响，从理论上分析了其作用机理。
free radicals activity and the way of the combination of structure unit from the angle ofmicroscopic theoretical chemistry. The standard polycarboxylate superplasticizer(PC) was getthrough the orthogonal experiment of synthetic technology conditions and the choice of additives′dosage using the theory of free radical copolymerization, which has the best initial dispersion anddispersion retention. Based on the standard polycarboxylate superplasticizer, a series ofpolycarboxylate superplasticizers were get by changing the density of carboxylic acids andintroducing different functional groups. All the kinds of PC were put forward by IR and GPC toanalyze the specie of group and the amount of molecular weight and distribution. The effect ofcarboxyl density and different functional groups on the shear stress, apparent viscosity and otherrheological properties was studied by rotational viscometer. The effect of carboxyl density anddifferent on cement hydration rate and heat, cement hydration products and early compressivestrength of mortar by cement hydration exothermic tester and X-ray diffractometer.
free radicals activity and the way of the combination of structure unit from the angle ofmicroscopic theoretical chemistry. The standard polycarboxylate superplasticizer(PC) was getthrough the orthogonal experiment of synthetic technology conditions and the choice of additives′dosage using the theory of free radical copolymerization, which has the best initial dispersion anddispersion retention. Based on the standard polycarboxylate superplasticizer, a series ofpolycarboxylate superplasticizers were get by changing the density of carboxylic acids andintroducing different functional groups. All the kinds of PC were put forward by IR and GPC toanalyze the specie of group and the amount of molecular weight and distribution. The effect ofcarboxyl density and different functional groups on the shear stress, apparent viscosity and otherrheological properties was studied by rotational viscometer. The effect of carboxyl density anddifferent on cement hydration rate and heat, cement hydration products and early compressivestrength of mortar by cement hydration exothermic tester and X-ray diffractometer.
引文
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