Huang Tao, Yuan Qing-Xia, Gong Shu-Ling
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China.
Polymers (Basel). 2020 Mar 24;12(3):730. doi: 10.3390/polym12030730.
The self-emulsifying acrylate-based emulsions with solid content 45 wt.% were prepared in 3.5 h by reverse iodine transfer polymerization (RITP), and the polymer molecular weight () could be 30,000 g·mol. The influences of methacrylic acid (MAA) amount, soft/hard monomer mass ratio, and iodine amount on polymerization and latex were investigated. A moderate amount of ionized MAA was needed to stabilize the emulsion. Glass transition temperature () was decreased with the increasing mass ratio of soft/hard monomer. A higher iodine amount resulted in lower . The increased after chain extension of the polymer with water-insoluble monomers in iterative one-pot method proved the living of polymer. Compared with conventional emulsion polymerization, molecular weight () could be controlled, and of polymer synthesized in RITP emulsion polymerization is higher; emulsion of polyacrylate-containing hydroxyl monomer units prepared by RITP emulsifier-free radical polymerization is more stable. Good properties, such as hardness, water resistance, adhesion, and increased value of maximum tensile of films modified by reaction of polyacrylate with melamine-formaldehyde (MF) resin, indicated potential application in baking coating.
通过反向碘转移聚合（RITP）在3.5小时内制备了固含量为45 wt.%的自乳化丙烯酸酯基乳液，聚合物分子量（）可达30,000 g·mol。研究了甲基丙烯酸（MAA）用量、软/硬单体质量比和碘用量对聚合反应和胶乳的影响。需要适量的离子化MAA来稳定乳液。玻璃化转变温度（）随着软/硬单体质量比的增加而降低。较高的碘用量导致较低的。通过迭代一锅法用不溶于水的单体对聚合物进行扩链后增加，证明了聚合物的活性。与传统乳液聚合相比，分子量（）可以得到控制，并且RITP乳液聚合合成的聚合物的更高；通过RITP无皂自由基聚合制备的含羟基单体单元的聚丙烯酸酯乳液更稳定。聚丙烯酸酯与三聚氰胺甲醛（MF）树脂反应改性的薄膜具有良好的性能，如硬度、耐水性、附着力和最大拉伸值增加，表明其在烘烤涂料中有潜在应用。
