通过顺序和一次性ATPR和“点击”反应合成的嵌段和杂乙基纤维素接枝共聚物,Chinese Journal of Chemistry

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通过顺序和一次性ATPR和“点击”反应合成的嵌段和杂乙基纤维素接枝共聚物
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2012-09-25 , DOI: 10.1002/cjoc.201200658
Qinmei Li , Hongliang Kang , Ruigang Liu

具有嵌段和杂侧链的乙基纤维素接枝共聚物，乙基纤维素接枝[聚苯乙烯-b-聚（乙二醇）] [EC- g-（PS- b - PEG）]和乙基纤维素接枝的聚苯乙烯和聚乙二醇[EC- g -（PS-PEG）]分别通过原子转移自由基聚合（ATRP）和炔烃-叠氮化物的“喀哒”反应和“单锅” ATRP和“喀哒”反应合成。用于EC- g-（PS- b的合成‐PEG），首先通过EC的羟基与2-溴异丁酰溴的酯化反应合成乙基纤维素2-溴异丁酯（EC-Br），从而合成ATRP的大分子引发剂。可以通过改变羟基与2-溴异丁酰溴的进料比例来调整决定接枝密度的溴化物基团的取代度。然后进行ATRP制备具有明确定义的PS链长度的EC - g -PS-Br。所述EC-克然后-PS -溴共聚物转化为EC-克-PS-N ₃，然后通过点击与端炔官能化的PEG反应，导致EC-克- （PS- b -PEG）。在EC- g ^通过将EC-Br的溴化物基团转变为叠氮化物基团（EC-Br-N ₃），然后通过一锅式ATRP和“点击”反应合成（PS-PEG）共聚物。所得的接枝共聚物通过FTIR和¹ H NMR进行表征。结果表明具有嵌段和杂侧链的纤维素接枝共聚物的合成方法成功。

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Block and Hetero Ethyl Cellulose Graft Copolymers Synthesized via Sequent and One‐pot ATRP and "Click" Reactions

Ethyl cellulose graft copolymers with block and hetero side chains, ethyl cellulose graft [polystyrene‐b‐poly(ethylene glycol)] [EC‐g‐(PS‐b‐PEG)] and ethyl cellulose graft polystyrene and polyethylene glycol [EC‐g‐(PS‐PEG )] were synthesized by atomic transfer radical polymerization (ATRP) and alkyne‐azide "click" reactions and "one‐pot" ATRP and "click" reactions, respectively. For the synthesis of EC‐g‐(PS‐b‐PEG), the macroinitiator for ATRP was first synthesized via the esterification of hydroxyl groups of EC with 2‐bromoisobutyryl bromide to result ethyl cellulose 2‐bromoisobutyryl ester (EC‐Br). The degree of substitution of bromide groups, which determined the graft density, can be tailored by varying the feeding ratios of the hydroxyl groups to 2‐bromoisobutyryl bromide. Then ATRP was carried out for preparing EC‐g‐PS‐Br with well‐defined length of PS chains. The EC‐g‐PS‐Br copolymers were then converted to EC‐g‐PS‐N₃ and then reacted with end alkyne‐functionalized PEG via click to result in EC‐g‐(PS‐b‐PEG). The EC‐g‐(PS‐PEG) copolymers were synthesized by converting bromide groups of EC‐Br to azide groups (EC‐Br‐N₃) and then by one‐pot ATRP and "click" reactions. The resultant graft copolymers were characterized by FTIR and ¹H NMR. The results indicate the success of the synthetic procedure of the cellulose graft copolymers with block and hetero side chains.

更新日期：2012-09-25

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