Key Laboratory of Applied Physics and Chemistry in Space of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.
J Colloid Interface Sci. 2012 May 15;374(1):54-60. doi: 10.1016/j.jcis.2012.01.030. Epub 2012 Jan 28.
Synthesis of poly (n-butyl acrylate)-b-polystyrene (PnBA-b-PSt) with high molecular weight in an environmentally benign medium was carried out in seeded emulsion polymerization, using a novel chain transfer active DPE (1,1-diphenylethylene) agent. Seed latex containing precursor P(nBA-DPE) was prepared first, and the second monomer styrene was swelled into seed latex particles, yielding block copolymer at high conversion. Structures as well as molecular weight of precursor and block copolymer were characterized by FTIR, (1)H NMR, and SEC, respectively. Furthermore, Transmission Electron Microscopy (TEM) observation and Laser Light Scattering (LLS) manifested that monodisperse latex particles were obtained. Self-assembly morphology of block copolymer membrane surface was examined by atom force microscopy (AFM). Phase separation was observed clearly, which was confirmed by the observation of two glass transitions in DSC curve.
在环境友好的介质中，采用新型链转移活性 DPE（1,1-二苯乙烯）试剂，进行种子乳液聚合，合成高分子量的聚（正丁基丙烯酸酯）-b-聚苯乙烯（PnBA-b-PSt）。首先制备含有前体 P(nBA-DPE)的种子乳液，然后将第二单体苯乙烯溶胀到种子乳胶粒中，在高转化率下得到嵌段共聚物。通过傅里叶变换红外光谱（FTIR）、（1）H 核磁共振（1H NMR）和凝胶渗透色谱（SEC）分别对前体和嵌段共聚物的结构和分子量进行了表征。此外，透射电子显微镜（TEM）观察和激光光散射（LLS）表明得到了单分散的乳胶粒。通过原子力显微镜（AFM）观察了嵌段共聚物膜表面的自组装形态。通过差示扫描量热法（DSC）曲线观察到两个玻璃化转变，清楚地证实了相分离。
