文章摘要
罗春华,董秋静,丁浩,侯玉梅,陈静.侧链含芘基的聚N-异丙基丙烯酰胺的合成及性能[J].精细化工,2020,37(11):
侧链含芘基的聚N-异丙基丙烯酰胺的合成及性能
Synthesis and properties of poly(N-isopropylacrylamide) with side chain of pyrenyl group
投稿时间:2020-06-13  修订日期:2020-07-10
DOI:
中文关键词: 聚N-异丙基丙烯酰胺  温敏性    荧光聚合物  环糊精
英文关键词: poly(N-isopropylacrylamide)  thermosensitivity  pyrene  fluorescent polymers  cyclodextrins
基金项目:安徽高校自然科学研究重点项目(KJ2018A0344,KJ2019A0523);国家级大学生创新训练项目(201910371023)
作者单位E-mail
罗春华 阜阳师范大学化学与材料工程学院 lch197919@163.com 
董秋静 阜阳师范大学化学与材料工程学院  
丁浩 阜阳师范大学化学与材料工程学院  
侯玉梅 阜阳师范大学化学与材料工程学院  
陈静 阜阳师范大学化学与材料工程学院  
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中文摘要:
      将N-异丙基丙烯酰胺(NIPAM)和甲基丙烯酸-β-(1-芘丁酰氧基)乙酯(PyBEMA)通过自由基溶液共聚合成了侧链含芘基的聚N-异丙基丙烯酰胺共聚物,并采用红外光谱、紫外光谱、核磁共振氢谱对共聚物进行了结构表征。研究了不同投料比对共聚物收率、组成和相对分子质量及其分布的影响。共聚物水溶液温敏性研究表明,共聚物是一类具有低临界溶解温度(LCST)温敏性聚合物,随着共聚物中的芘基含量的升高,其LCST下降;加入α-环糊精(α-CD)会引起共聚物LCST略微升高,而加入β-CD和γ-CD,会导致LCST降低,而且γ-CD引起LCST的降低更显著。共聚物水溶液荧光性能研究表明,共聚物在水中有轻微的疏水聚集,出现侧链芘基激基缔合物荧光。室温下,加入β-CD能够降低共聚物侧链芘基之间的疏水聚集。随着温度的升高,芘基的荧光强度(IM)先下降,后突然升高,然后达到稳定并略微下降;而芘激基缔合物的荧光强度(IE)先出现略微升高,然后基本保持不变,接着缓慢下降。I1/I3荧光强度比值随着温度的升高呈现下降趋势,在聚合物发生相转变时的温度区间内迅速降低。
英文摘要:
      Poly(N-isopropylacrylamide) copolymers with side chain of pyrenyl group were synthesized by radical solution copolymerization of N-isopropylacrylamide (NIPAM) and β-pyrenebutanoyloxyethyl methacrylate (PyBEMA). The structure of the copolymers was characterized by IR, UV and 1H NMR spectra. The effects of different feed ratios on the yield, composition, relative molecular weight and distribution of copolymers were investigated. The results of the copolymers aqueous solutions show that the as-synthesized copolymers are a kind of thermosensitive polymers with lower critical solution temperature (LCST), and its LCST decreases with the increase of the pyrenyl content in the copolymers. Addition of α-cyclodextrins (α-CD) will cause a slight increase in LCST of copolymers, while addition of β-CD and γ-CD will cause a decrease in LCST, and γ-CD will cause a more significant decrease in LCST. The fluorescence properties of copolymer aqueous solutions show that the copolymers have slight hydrophobic aggregation in water because it exists of pyrenyl excimer fluorescence. At room temperature, the addition of β-CD can reduce the hydrophobic aggregation of pyrene groups in the copolymer side chains. With the increase of temperature, the fluorescence intensity (IM) of pyrenyl monomer first decreased, then suddenly increased, then reached a stable and slightly decreased. However, the fluorescence intensity (IE) of pyrenyl excimer first increased slightly, then remained basically unchanged, and then decreased slowly. The ratio of I1/I3 decreased with the increase of temperature, and decreased suddenly in the temperature range when the polymer phase transition occurred.
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