Click-Dendronized Poly(amide-triazole)s-Effect of Dendron Size and Polymer Backbone Symmetry on Self-Assembling and Gelation Properties
作者:Hak-Fun Chow、Kwun-Ngai Lau、Man-Chor Chan
DOI:10.1002/chem.201101045
日期:2011.7.18
Nine dendronized poly(amide–triazole)s 2‐Gm Gn (m=1–3, n=1–3), were prepared by the 1:1 copolymerization between AA‐type dendritic diazides 4‐Gm (m=1–3) and BB‐type dendritic diacetylenes 5‐Gn (n=1–3) under the copper(I)‐mediated click coupling conditions. The degree of polymerization value of the polymers was found to range from 15–50, and decreased with increasing size of the dendron, suggesting
通过AA型树枝状叠氮化物4-G m之间的1:1共聚制备了九个树枝状聚(酰胺-三唑)2-G m G n(m = 1-3,n = 1-3)(m = 1–3)和BB型树突状二乙炔5–G n(n = 1–3)在铜(I)介导的点击偶联条件下。发现聚合物的聚合度值在15–50范围内,并且随着树枝状分子尺寸的增加而降低,这表明空间位阻对共聚效率具有延迟作用。基于FT‐IR和11 H NMR研究发现,共聚后溶液状态下酰胺单元之间存在明显的牢固的链间氢键,而单体4-G m和5-G n没有分子间氢键相互作用。因此,聚合后观察到正的变构氢键合效应,并且可以通过拉链效应使其合理化。链间的关联在聚合物中的强度2-G米 ģ Ñ发现随树枝状大分子的大小减小(即,2-G1 G1 > 2-G1 G2 > 2 - G2 G1 ≈ 2-G2 G2 >2-G1 G3 ≈ 2-G3 G1 > 2-G2 G3 ≈ 2-G3 G2 >