Hyperbranched polyethers with tunable glass transition temperature: controlled synthesis and mixing rules
作者:Tuan Liu、Xinxin Geng、Yongxing Nie、Ruoshi Chen、Yan Meng、Xiaoyu Li
DOI:10.1039/c4ra04077e
日期:——
By taking advantage of competing side reactions, controlled synthesis of a series of homo- and co-polymerized hyperbranched polyethers (HBPEs) is demonstrated using AB2 monomers of different spacer lengths. This reacting system shows good controllability and scalability. More importantly, the degree of branching is found to be insensitive to the molecular weight and spacer length in monomers. Thus
通过利用竞争性副反应,使用不同间隔长度的AB 2单体,证明了一系列均聚和共聚的超支化聚醚(HBPE)的受控合成。该反应系统显示出良好的可控制性和可扩展性。更重要的是,发现支化度对单体的分子量和间隔基长度不敏感。因此,可以通过改变单体间隔物的长度,端基,分子量以及通过共聚和物理共混来调节T g的值和宽度。的依赖性Ť克在上组合物的二进制均聚物的共混物和的依赖性Ť克首次确定了共聚物中的单体比并进行了比较。共聚物的T g遵循Fox方程,而二元共混物中的T g仅遵循Kwei方程。共聚不会增加T g的宽度。相反,即使可以通过增加端基的极性来减小T g的增宽,二元共混物的T g的宽度也比共聚物的宽得多。