已成功开发出一种合成方法,该方法利用微乳液中的受限胶束空间来调节分子的原子转移自由基聚合(ATRP),从而生产出结构明确的超支化聚合物。对实验变量的系统探索,包括基于甲基丙烯酸酯的五个种类的惰性分子,两个ATRP配体以及不同数量的惰性分子和催化剂,产生了一系列涵盖了广泛分子量的超支化聚合物(M n = 194–1301 kg / mol ),高支化度(DB = 0.26-0.41)和窄分子量分布(M w / M n= 1.1–1.7)。微乳液介质中引发剂的ATRP表现出快速的聚合速率,并在0.5小时内实现了甲基丙烯酸酯基团的定量转化。在高转化率下,每个离散的乳胶颗粒基本上都存在一种超支化聚合物,其尺寸(在水中的流体动力学直径D h = 10.95–20.13 nm)和均匀性直接决定了超支化聚合物的分子量和多分散性。超支化聚合物的DB使用反门控13定量测定13 C NMR光谱法,其值受几个参
New Method To Access Hyperbranched Polymers with Uniform Structure via One-Pot Polymerization of Inimer in Microemulsion
作者:Ke Min、Haifeng Gao
DOI:10.1021/ja307174h
日期:2012.9.26
A facile approach is presented for successful synthesis of hyperbranched polymers with high molecular weight and uniform structure by a one-pot polymerization of an inimer in a microemulsion. The segregated space in the microemulsion confined the inimer polymerization and particularly the polymer polymer reaction within discrete nanoparticles. At the end of polymerization, each nanoparticle contained one hyperbranched polymer that had thousands of inimer units and low polydispersity. The hyperbranched polymers were used as multifunctional macroinitiators for synthesis of "hyper-star" polymers. When a degradable inimer was applied, the hyper-stars showed fast degradation into linear polymer chains with low molecular weight.
SYNTHESIZING HYPERBRANCHED POLYMERS WITH UNIFORM STRUCTURE IN CONFINED SPACE
申请人:Gao Haifeng
公开号:US20150368379A1
公开(公告)日:2015-12-24
Hyperbranched polymers are synthesized with uniform structure based on one pot polymerization technique in confined space with nanometer scale, e.g. micelles in a microemulsion system. The segregated space in micelles or polymerizing nanoparticles is expected to regulate the growth of hyperbranched polymers by confining polymer-polymer reaction inside each individual locus. The obtained hyperbranched polymers have uniform size, similar to the size of nanoparticles, as indicated by a narrow molecular weight distribution of the polymers.
Exploring Self-Condensing Vinyl Polymerization of Inimers in Microemulsion To Regulate the Structures of Hyperbranched Polymers
作者:Robert W. Graff、Xiaofeng Wang、Haifeng Gao
DOI:10.1021/acs.macromol.5b00278
日期:2015.4.14
fast polymerization rate with quantitative conversion of methacrylate groups within 0.5 h. At high conversion, there was essentially one hyperbranched polymer per discrete latex particle, whose dimension (hydrodynamic diameter Dh = 10.95–20.13 nm in water) and uniformity directly determined the molecular weight and polydispersity of the hyperbranched polymer. The DB of hyperbranched polymers was quantitatively
已成功开发出一种合成方法,该方法利用微乳液中的受限胶束空间来调节分子的原子转移自由基聚合(ATRP),从而生产出结构明确的超支化聚合物。对实验变量的系统探索,包括基于甲基丙烯酸酯的五个种类的惰性分子,两个ATRP配体以及不同数量的惰性分子和催化剂,产生了一系列涵盖了广泛分子量的超支化聚合物(M n = 194–1301 kg / mol ),高支化度(DB = 0.26-0.41)和窄分子量分布(M w / M n= 1.1–1.7)。微乳液介质中引发剂的ATRP表现出快速的聚合速率,并在0.5小时内实现了甲基丙烯酸酯基团的定量转化。在高转化率下,每个离散的乳胶颗粒基本上都存在一种超支化聚合物,其尺寸(在水中的流体动力学直径D h = 10.95–20.13 nm)和均匀性直接决定了超支化聚合物的分子量和多分散性。超支化聚合物的DB使用反门控13定量测定13 C NMR光谱法,其值受几个参