An efficient route to macrocyclic polymers via “click” cyclization was presented.The α-bromine and ω-alkyne PMMA were prepared using the standard ATRP technique,initiated with propargyl 2-bromoisobutyrate,Cu(Ⅰ)Br...An efficient route to macrocyclic polymers via “click” cyclization was presented.The α-bromine and ω-alkyne PMMA were prepared using the standard ATRP technique,initiated with propargyl 2-bromoisobutyrate,Cu(Ⅰ)Br and N,N,N’,N″,N-pentamethyldiethylenetriamine(PMDETA).Azidation of the terminal bromine was followed in DMF with sodium azide,and α-azide,ω-alkyne PMMA precursor was obtained.Then the “click” cylcization of precursor between terminal azide and alkyne was carried out under the catalysis of CuBr/PMDETA,during the course of the reaction,a pseudo-high dilution technique was utilized to ensure the favored intramolecular cylcization.The nearly complete cylcization has been confirmed by a combination of IR,1H NMR and GPC analysis,and cyclo-PMMA with an Mn of 15000,PDI of 1.38 was obtained.展开更多
随着纤维素应用领域的扩大,对纤维素及其衍生物的接枝改性以提高其适用性变得尤其重要。原子转移自由基聚合(Atom Transfer Radical Polymerization,ATRP)法用于纤维素接枝改性,由于其可控性、活性,且能引入多种接枝链段赋予纤维素不同...随着纤维素应用领域的扩大,对纤维素及其衍生物的接枝改性以提高其适用性变得尤其重要。原子转移自由基聚合(Atom Transfer Radical Polymerization,ATRP)法用于纤维素接枝改性,由于其可控性、活性,且能引入多种接枝链段赋予纤维素不同的性能从而扩大纤维素的应用范围,该方法已得到广泛的关注和研究。本文综述了近十年关于ATRP法用于纤维素接枝改性方面的报道,以不同的纤维素基材为分类,描述多种乙烯基单体在纤维素上进行ATRP接枝共聚的过程,重点介绍纤维素接枝共聚物的新性能以及在不同领域的应用。展开更多
文摘An efficient route to macrocyclic polymers via “click” cyclization was presented.The α-bromine and ω-alkyne PMMA were prepared using the standard ATRP technique,initiated with propargyl 2-bromoisobutyrate,Cu(Ⅰ)Br and N,N,N’,N″,N-pentamethyldiethylenetriamine(PMDETA).Azidation of the terminal bromine was followed in DMF with sodium azide,and α-azide,ω-alkyne PMMA precursor was obtained.Then the “click” cylcization of precursor between terminal azide and alkyne was carried out under the catalysis of CuBr/PMDETA,during the course of the reaction,a pseudo-high dilution technique was utilized to ensure the favored intramolecular cylcization.The nearly complete cylcization has been confirmed by a combination of IR,1H NMR and GPC analysis,and cyclo-PMMA with an Mn of 15000,PDI of 1.38 was obtained.
文摘随着纤维素应用领域的扩大,对纤维素及其衍生物的接枝改性以提高其适用性变得尤其重要。原子转移自由基聚合(Atom Transfer Radical Polymerization,ATRP)法用于纤维素接枝改性,由于其可控性、活性,且能引入多种接枝链段赋予纤维素不同的性能从而扩大纤维素的应用范围,该方法已得到广泛的关注和研究。本文综述了近十年关于ATRP法用于纤维素接枝改性方面的报道,以不同的纤维素基材为分类,描述多种乙烯基单体在纤维素上进行ATRP接枝共聚的过程,重点介绍纤维素接枝共聚物的新性能以及在不同领域的应用。
