阴、阳离子型淀粉接枝共聚物W/O超浓乳液的合成研究

以SPAN-TOWEN为复合乳化剂、ISOPAN-M50为分散介质、直链淀粉为骨架，在不搅拌条件下，通过程控升温，用超浓W/O乳液接枝聚合直接合成了Fd≥0.76的交联共聚合物W/O超浓乳液阴离子型AGU-PAM-PAANa(Ⅰ)及阳离子型AGU-PAM-PDMDAAC(Ⅱ)。(Ⅰ)程控升温聚合的最佳升温速率为2.5℃/min，(Ⅱ)的为3.8℃/min；(Ⅰ)、(Ⅱ)的最高温升分别为90士1℃和98士1℃。动力学研究表明以内相为引发场所的超浓W/O乳液聚合不同于超浓O/W乳液聚合，而更接近悬浮聚合机理，DMDAC的聚合速度比AANa的大，AGU对阴、阳离子的反应均有促进作用。(Ⅱ)、(Ⅰ)经水稀释后分别得到水膨胀型正、负粒子的乳液制剂(C)、(A)。(C)、(A)的流变学行为均呈假塑性流体行为，显现了EOR功能特征。

Studies on the syntheses of W/O ultra-concentrated emulsion grafting anionic or cationic monomers onto starch

W/O ultra-concentrated emulsion is a series of gellike and high-stable emulsion with fractions of the dispersed phase (Fd) exceeding the critical value of the dispersed phase (0.7405). On the foundation of originating W/O ultra-concentrated emulsion, using SPAN and TOWEN as the complex emulsifier, ISOPAN-M50 as the continuouos phase, by adjusting the temperature of the polymerization system instead of stirring, a twain of anion and cation crosslinking copolymer emulsions, PAM-PAA(Ⅰ) and PAM-PDMDAAC(Ⅱ), were synthesized with Fd=0.76～0.77 successfully. The studies on the characteristics of emulsive products showed that minute suspend and water-swelled mini-particles were(A) and(C) formed when the emulsive product was diluted by water.The theology investigation has shown that both the polymer emulsion (Ⅰ)( Ⅱ ) and the emulsive product (A) (C) all are pseudoplasticity. The kinetic studies on the polymerization whole process has indicated that the mechanism of this process is difference from the mechanism of the normal emulsion polymerization and are more incarnating the mechanism of the suspension polymerzation.