Zhou Jianhua, He Renyan, Ma Jianzhong
School of Light Industry Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Shaanxi Research Institute of Agricultural Products Processing Technology, Xi'an 710021, China.
Polymers (Basel). 2016 May 27;8(6):207. doi: 10.3390/polym8060207.
This paper describes a very simple strategy towards self-stabilized poly(acrylic acid)--poly(hexafluorobutyl acrylate) (PAA--PHFBA) block copolymer particles via reversible addition-fragmentation chain transfer (RAFT)-mediated polymerization-induced self-assembly. Hexafluorobutyl acrylate (HFBA) monomer conversion and number-average molar mass of PAA--PHFBA increased gradually with the increase in the pH value of the aqueous phase. When pH < 10, the molecular weight distributions of PAA--PHFBA were narrow, however, when the pH was raised to 11.55, PAA--PHFBA block copolymers had a broader distribution ( = 1.82) with a serious trailing toward the low molecular weight. Furthermore, the morphology and size of PAA--PHFBA latex particles were measured by transmission electron microscopy and dynamic light scattering. The results indicated that the PAA--PHFBA latex particles had a clear spherical core-shell structure and the latex particles' size increased with the increase of pH value.
本文描述了一种通过可逆加成-断裂链转移（RAFT）介导的聚合诱导自组装制备自稳定聚（丙烯酸）-聚（丙烯酸六氟丁酯）（PAA-PHFBA）嵌段共聚物颗粒的非常简单的策略。随着水相pH值的增加，丙烯酸六氟丁酯（HFBA）单体转化率和PAA-PHFBA的数均摩尔质量逐渐增加。当pH<10时，PAA-PHFBA的分子量分布较窄，然而，当pH值升高到11.55时，PAA-PHFBA嵌段共聚物具有更宽的分布（Đ=1.82），并且向低分子量方向有严重拖尾。此外，通过透射电子显微镜和动态光散射测量了PAA-PHFBA胶乳颗粒的形态和尺寸。结果表明，PAA-PHFBA胶乳颗粒具有清晰的球形核壳结构，并且胶乳颗粒的尺寸随着pH值的增加而增大。
