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论文类型：期刊论文

发表时间：2016-09-28

发表刊物：POLYMER

收录刊物：SCIE、EI、Scopus

卷号：101

页面范围：241-256

ISSN号：0032-3861

关键字：Donor-acceptor polymers; Phthalazinone; Ullmann C-N coupling polymerization

摘要：The copper catalyzed Ullmann polymerization is rarely used in polymer chemistry filed owing to the covered mechanism and insufficient conversion. Herein, we present the development of an efficient Ullmann C-N coupling polymerization route to synthesize conjugated Donor-Acceptor (D-A) polymers containing thiophene-phthalazinone moiety. The model reactions were carried out to investigate varies solvents, bases, catalytic systems and substrate reactivity effects on the Ullmann C-N coupling reactions. We demonstrate that the reaction conversion is highly depended on the substrate reactivity. By designing rational structures of thiophene-based di-bromo monomers, the molecular weights of polymers synthesized by classic Ullmann C-N coupling polymerization are high, in range of 6.4-34.6 kDa (PDI = 1.54-3.18) with 77-98% yields. Benefiting from the D-A conjugated effect of thiophene-phthalazinone moiety, the optoelectronics properties were studied and these nine polymers show strong UV-Vis-NIR absorption manners and emission color from blue to red regions. Overall, given the discussions and results in this work offer a new perspective for classic Ullmann C- N coupling polymerization to synthesize high molecular weight polymers as promising candidates for photoelectric materials. (C) 2016 Elsevier Ltd. All rights reserved.