Structure, Solution Aggregation and UV Curing of Hyperbranched Poly(ester-amine)s with Terminal Acrylate Groups
Structure, Solution Aggregation and UV Curing of Hyperbranched Poly(ester-amine)s with Terminal Acrylate Groups
复制标题
具有末端丙烯酸酯基团的超支化聚(酯-胺)的结构、溶液聚集和紫外固化
DOI：
10.1295/polymj.37.255
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发表时间：
2005
期刊：
影响因子：
2.8
通讯作者：
Ji Feng
中科院分区：
文献类型：
--
作者：
Liming Tang;Yu Fang;Ji Feng
以哌嗪（A2）和正丙烷三丙烯酸酯（TMPTA）（B3）为原料，在摩尔比为1/2 ~ 1/1.08的范围内，通过Michael加成反应合成了一系列末端带有丙烯酸酯基的超支化聚酯胺（HPEA-1 ~ HPEA-5）。随着哌嗪与TMPTA摩尔比的增加，聚合物的支化度（DB）、数均分子量（Mn）、多分散性指数（Mw/Mn）和玻璃化转变温度（Tg）相应增加。由于其两亲性的柔性结构，聚合物在丙酮-酸性水选择性溶液（体积比为1/25）中可以形成稳定的聚集体。通过动态光散射（DLS）研究了聚合物结构和溶液pH值对聚集体粒径和粒径分布的影响。结果表明，Mn越高，聚合物的粒径越小，粒径分布随Mw/Mn的变化而变化。在较低的溶液pH值下，得到较小的尺寸和较窄的尺寸分布。此外，通过UV光照射聚合物分散体以引发聚集体内的丙烯酸酯基团的聚合。通过DLS和透射电子显微镜（TEM）测定，所得固化颗粒具有与相应聚集体的尺寸相比减小的尺寸。
A series of hyperbranched poly(ester-amine)s (defined as HPEA-1–HPEA-5) with terminal acrylate groups were synthesized through Michael addition between piperazine (A2) and trimethylolpropanetriacrylate (TMPTA) (B3) under molar ratios ranged from 1/2 to 1/1.08. As increasing the molar ratio between piperazine and TMPTA, the degree of branching (DB), number average molecular weight (Mn), polydispersity index (Mw/Mn) and glass transition temperature (Tg) of the polymers increased accordingly. Due to their amphiphilic flexible structures, the polymers could form stable aggregates in acetone–acidic water selective solution at volume ratio of 1/25. The influences of polymer structures and the solution pH on the size and size distribution of the aggregates were measured by dynamic light scattering (DLS). The results indicated that smaller size was obtained for the polymer with higher Mn, while the size distribution changed in accordance with Mw/Mn. At lower solution pH, both smaller size and narrower size distribution were obtained. Furthermore, the polymer dispersions were irradiated by UV light to initiate polymerization of acrylate groups within the aggregates. The resulting cured particles possessed decreased size compared with the size of the corresponding aggregates as determined by DLS and transmission electron microscopy (TEM).