Nanoparticles with Individual Site-Isolated Semiconducting Polymers from Intramolecular Chain Collapse Processes

被引:48
作者
Adkins, Chinessa T. [1 ]
Muchalski, Hubert [1 ]
Harth, Eva [1 ]
机构
[1] Vanderbilt Univ, Dept Chem, Stevenson Ctr 7619, Nashville, TN 37235 USA
基金
美国国家科学基金会;
关键词
RADICAL POLYMERIZATIONS; HIGHLY FLUORESCENT; OPTICAL-PROPERTIES; ENCAPSULATION; STAINS; DOTS;
D O I
10.1021/ma9007913
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We present the synthesis of polymeric nanoparticles from single ABA type block copolymers in an intramolecular-chain process to result 3-D architectures that confine a single chain of conducting copolymers. ABA triblock copolymers were prepared from conducting polymers such as fluorene homopolymers and fluorene/thiophene copolymers designed as telechelic macroinitiators to facilitate nitroxide-mediated living free radical polymerization methods. The polymerization with styrene and vinylbenzosulfone cross-linking units led to the desired ABA triblock copolymers with 8:1:8 and 5:1:5 ratios of the polymer copolymer blocks under living free radical polymerization conditions. In an intramolecular chain collapse process the ABA triblock copolymers form well-defined single chain nanoparticles with the confined semiconducting polymer block as core unit via a controlled cross-linking of the benzosulfone unit in the A block copolymer. The photoluminescence measurements illustrate the influence of the molecular weight of the A block to be crucial for the site isolation of the embedded conducting polymer block in the resulting nanoparticles with increased quantum efficiencies of 6%.
引用
收藏
页码:5786 / 5792
页数:7
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