具有可控质子化能力的阳离子聚合物的合成及表征
发布时间:2018-08-29 18:36
【摘要】:合成了聚乙二醇-聚赖氨酸嵌段共聚物(PEG-PLL),并利用Michael加成反应对其侧链进行叔胺和季铵化修饰,得到一系列具有支化胺结构和可控质子化能力的聚赖氨酸衍生物。通过核磁共振氢谱、傅里叶变换红外光谱和凝胶渗透色谱对聚合物的结构进行表征。利用pH滴定研究聚合物的质子化行为,发现季铵和叔胺修饰能够显著改变阳离子聚合物的质子缓冲能力,将pKa值从10.6分别降低至7.5和6.8。圆二色谱测试结果表明侧基修饰不仅使聚赖氨酸嵌段从无规卷曲构象变为含有α螺旋和β折叠的混合构象,而且能够调节其高级结构对肿瘤微环境的响应能力。
[Abstract]:Poly (ethylene glycol) -poly (lysine) block copolymer (PEG-PLL) was synthesized and modified with tertiary amine and quaternary ammonium by Michael addition reaction. A series of poly (lysine) derivatives with branched amine structure and controllable protonation ability were obtained. The structure of the polymer was characterized by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). PH titration was used to study the protonation behavior of cationic polymers. It was found that the modification of quaternary ammonium and tertiary amine could significantly change the proton buffer capacity of cationic polymers, reducing the pKa value from 10.6 to 7.5 and 6.8 respectively. The results of circular dichroism showed that the modification not only changed the poly (lysine) block from random coil conformation to a mixed conformation with 伪 helix and 尾 folding, but also regulated the response of its advanced structure to tumor microenvironment.
【作者单位】: 四川大学高分子科学与工程学院高分子材料工程国家重点实验室(四川大学);
【基金】:国家自然科学基金资助项目(21474064,51203101) 高分子材料工程国家重点实验室开放课题(sklpme2015-3-02)
【分类号】:O631
本文编号:2212062
[Abstract]:Poly (ethylene glycol) -poly (lysine) block copolymer (PEG-PLL) was synthesized and modified with tertiary amine and quaternary ammonium by Michael addition reaction. A series of poly (lysine) derivatives with branched amine structure and controllable protonation ability were obtained. The structure of the polymer was characterized by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). PH titration was used to study the protonation behavior of cationic polymers. It was found that the modification of quaternary ammonium and tertiary amine could significantly change the proton buffer capacity of cationic polymers, reducing the pKa value from 10.6 to 7.5 and 6.8 respectively. The results of circular dichroism showed that the modification not only changed the poly (lysine) block from random coil conformation to a mixed conformation with 伪 helix and 尾 folding, but also regulated the response of its advanced structure to tumor microenvironment.
【作者单位】: 四川大学高分子科学与工程学院高分子材料工程国家重点实验室(四川大学);
【基金】:国家自然科学基金资助项目(21474064,51203101) 高分子材料工程国家重点实验室开放课题(sklpme2015-3-02)
【分类号】:O631
【相似文献】
相关期刊论文 前2条
1 柳潇雄;;阳离子聚合物在粘土表面的吸附作用研究进展[J];中国新技术新产品;2014年12期
2 谭业邦,张黎明,李卓美;用高分子化学反应法制备阳离子聚合物[J];精细石油化工;1998年04期
相关会议论文 前2条
1 卢小菊;孟令芝;刘云海;张立芬;;胍基阳离子聚合物用于基因载体的研究[A];2007年全国高分子学术论文报告会论文摘要集(下册)[C];2007年
2 杜红;朱蔚璞;沈之荃;;巯-烯“点击”化学制备抗菌水凝胶[A];2013年全国高分子学术论文报告会论文摘要集——主题H:医用高分子[C];2013年
相关硕士学位论文 前3条
1 李雪;低聚阳离子聚合物的合成与性能研究[D];大庆石油学院;2010年
2 黄新照;新型阳离子聚合物的制备与性能研究[D];青岛大学;2008年
3 陈三桂;多拓扑结构阳离子聚合物的制备及其组装动力学分析[D];安徽建筑大学;2014年
,本文编号:2212062
本文链接:https://www.wllwen.com/kejilunwen/huaxue/2212062.html
教材专著