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有机铬(Ⅲ)的加入能使HPAM发生分子间的交联,HPAM分子在水中分散得更均匀;通过紫外-可见分光光度计在波长410nm处测定HPAM/有机铬凝胶体系渗透液的有机铬吸光度值,用插值法在标准有机铬溶液A-c直线上找出渗透液中铬离子的浓度ρd,计算参与凝胶体系交联的交联密度ρ。并考察了不同温度下交联密度的变化情况,在一定温度范围内(30～80℃),温度越高,交联密度越大(6.0810-5～18.7×10-5),见表3。聚合物分子量越大,交联密度越大,见表4。
The addition of organic chromium (Ⅲ) can make the intermolecular cross-linking of HPAM, and the HPAM molecules disperse more evenly in water. The organic chromium of HPAM / organochromium gel permeate was measured by UV-visible spectrophotometer at the wavelength of 410 nm Absorbance value, the interpolation method in the standard organic chromium solution Ac straight line to find out the concentration of chromium in the permeate ρd, to calculate the crosslinked crosslinked gel system ρ density. The changes of crosslinking density at different temperatures were also investigated. The higher the temperature is, the higher the crosslinking density (6.0810-5 ~ 18.7 × 10-5) in a certain temperature range (30 ~ 80 ℃) is shown in Table 3. The larger the molecular weight of the polymer, the greater the crosslink density. See Table 4.