期刊
CELLULOSE
卷 28, 期 11, 页码 6857-6868出版社
SPRINGER
DOI: 10.1007/s10570-021-03964-x
关键词
Bottlebrush; Janus; Regioselective grafting; Microphase separation
资金
- Joint Usage/Research Center (JURC) at the Institute for Chemical Research, Kyoto University, Japan
In this study, novel Janus bottlebrushes with cellulose as a polymeric backbone were synthesized and self-assembled, showing microscale morphologies that have the potential to lead to the development of polymers with new morphologies and functionalities.
In this article, we describe the synthesis and self-assembly of novel Janus bottlebrushes with cellulose as a polymeric backbone. The cellulosic Janus bottlebrushes, bearing poly(epsilon-caprolactone) (PCL) and polystyrene (PS) branches at the C-2,3 and C-6 positions of anhydroglucose units, respectively, were successfully prepared using a bulky p-methoxytrityl protecting group and by combining the grafting-from ring-opening polymerization of epsilon-caprolactone with the grafting-to click chemistry of PS. The degree of substitution of PCL at the C-2,3 positions was estimated to be 1.5, whereas values of 0.64-0.84 were estimated for the C-6 position of PSs with different molecular weights (number-average molecular weight = 4.0, 9.2, or 16 kg mol(-1)), depending on the length of the PS graft. The Janus bottlebrushes (PS/PCL = 50:50 v/v) self-assembled to form a lamellar microdomain structure comprising three layers (amorphous PCL, crystalline PCL, and amorphous PS layers), as characterized by small-angle X-ray scattering and transmission electron microscopy. The interlamellar distance was approximately 30 nm, depending on the length of the PS graft. The results illustrate that cellulosic polymeric backbones for Janus bottlebrushes can exhibit microscale morphologies, potentially leading to the development of polymers with new morphologies and functionalities. [GRAPHICS] .
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据