適配雙鏈與非適配單鏈包結(jié)γ-CD聚準輪烷嵌段共聚物合成與表征
發(fā)布時間：2019-03-31 14:36
【摘要】：首先在精準控制摩爾投料比條件下,通過緩慢加料方式制備出以2-溴異丁�；鶠槎嘶碾p三縮四乙二醇偶氮苯二甲酸酯(Br-EG_4-AZO-EG_4-Br,1)作為引發(fā)劑,然后在[γ-CD]/[1]=4的條件下,將1與γ-環(huán)糊精(γ-CD)在水溶液中進行自組裝制備得到雙鏈包結(jié)聚準輪烷(i PPR),進而用該聚準輪烷原位引發(fā)N-異丙基丙烯酰胺(NIPAAm)進行原子轉(zhuǎn)移自由基聚合(ATRP)得到聚準輪烷嵌段共聚物(PPRs).分析結(jié)果表明,該類共聚物以γ-CD與偶氮苯和折疊三縮四乙二醇鏈自組裝形成的適配雙鏈包結(jié)結(jié)構(gòu)的形式存在,而在與由1引發(fā)NIPAAm進行ATRP聚合所制備的PNIPAAm-EG_4-AZO-EG_4-PNIPAAm進行自組裝包結(jié)時,γ-CD則均勻分布在整條共聚物鏈上生成非適配單鏈包結(jié)聚準輪烷嵌段共聚物(a PPRs).與引發(fā)劑1和a PPRs相比,PPRs中代表反式偶氮苯基團的紫外吸收峰發(fā)生明顯紅移,但紫外光照射產(chǎn)生的順式異構(gòu)化幾乎不導致γ-CD滑脫下鏈,說明γ-CD與偶氮苯和折疊三縮四乙二醇包結(jié)形成的適配雙鏈包結(jié)結(jié)構(gòu)不僅穩(wěn)定性高,而且還能可逆地轉(zhuǎn)化為γ-CD與雙三縮四乙二醇鏈包結(jié)形式的適配雙鏈包結(jié)結(jié)構(gòu).
[Abstract]:At first, bis-triethyleneglycol azophthalate (Br-EG_4-AZO-EG_4-Br,1) with 2-bromoisobutyryl group as terminal group was prepared by slow feeding method under the condition of accurate and controlled molar ratio, which was used as initiator. Then, under the condition of [緯-CD] / [1] = 4, the self-assembly of 1 and 緯-cyclodextrin (緯-CD) was carried out in aqueous solution to prepare double-stranded inclusion poly (quasi-rotane) (i PPR),. Then the poly (quasi-rotane) block copolymer (PPRs). Was synthesized by atom transfer radical polymerization (ATRP) with N-isopropylacrylamide (NIPAAm) initiated by the in-situ initiation of the poly (quasi-rotane). The results show that the copolymer exists in the form of self-assembly of 緯-CD with azobenzene and folded triethyleneglycol chains. On the other hand, when self-assembled with PNIPAAm-EG_4-AZO-EG_4-PNIPAAm prepared by ATRP polymerization of 1-initiated NIPAAm, 緯-CD homogeneously distributed over the whole chain of copolymers to form unsuitable single-stranded inclusion copolymers of quasi-rotane block copolymers (a PPRs). Compared with initiators 1 and a PPRs, the UV absorption peaks representing trans-azobenzene groups in PPRs showed a significant red shift, but the cis-isomerization produced by UV irradiation did not lead to the slippage of 緯-CD. The results show that the suitable double-stranded inclusion structure formed by 緯-CD with azobenzene and folded triethyleneglycol not only has high stability, but also can be inversely transformed into a suitable double-stranded structure in the form of 緯-CD and double triethyleneglycol entrapment.
【作者單位】： 北京理工大學材料學院;
【分類號】：O631
[Abstract]:At first, bis-triethyleneglycol azophthalate (Br-EG_4-AZO-EG_4-Br,1) with 2-bromoisobutyryl group as terminal group was prepared by slow feeding method under the condition of accurate and controlled molar ratio, which was used as initiator. Then, under the condition of [緯-CD] / [1] = 4, the self-assembly of 1 and 緯-cyclodextrin (緯-CD) was carried out in aqueous solution to prepare double-stranded inclusion poly (quasi-rotane) (i PPR),. Then the poly (quasi-rotane) block copolymer (PPRs). Was synthesized by atom transfer radical polymerization (ATRP) with N-isopropylacrylamide (NIPAAm) initiated by the in-situ initiation of the poly (quasi-rotane). The results show that the copolymer exists in the form of self-assembly of 緯-CD with azobenzene and folded triethyleneglycol chains. On the other hand, when self-assembled with PNIPAAm-EG_4-AZO-EG_4-PNIPAAm prepared by ATRP polymerization of 1-initiated NIPAAm, 緯-CD homogeneously distributed over the whole chain of copolymers to form unsuitable single-stranded inclusion copolymers of quasi-rotane block copolymers (a PPRs). Compared with initiators 1 and a PPRs, the UV absorption peaks representing trans-azobenzene groups in PPRs showed a significant red shift, but the cis-isomerization produced by UV irradiation did not lead to the slippage of 緯-CD. The results show that the suitable double-stranded inclusion structure formed by 緯-CD with azobenzene and folded triethyleneglycol not only has high stability, but also can be inversely transformed into a suitable double-stranded structure in the form of 緯-CD and double triethyleneglycol entrapment.
【作者單位】： 北京理工大學材料學院;
【分類號】：O631
【參考文獻】
相關(guān)期刊論文 前2條
1 高鵬;王培境;耿雪;葉霖;張愛英;馮增國;;γ-環(huán)糊精包結(jié)折疊雙鏈PEG聚準輪烷材料的性能研究[J];化學學報;2013年03期
2 孫濤;李月明;辛飛飛;李尚洋;侯月會;郝愛友;;基于環(huán)糊精和偶氮化合物的光控可逆超分子體系[J];化學進展;2012年01期
【共引文獻】
相關(guān)期刊論文 前8條
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