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Conductive chitosan-graft-polyaniline copolymer: synthesis and characterization
Polymer Bulletin ( IF 3.2 ) Pub Date : 2021-07-01 , DOI: 10.1007/s00289-021-03818-3
Cheng-Ho Chen , Hong-Tu Wu , Ching-Feng Mao , Wei-Tung Liao

Chitosan-graft-polyaniline (Chi-g-PANI) copolymer was successfully synthesized via the chemical oxidative polymerization method. The influence of various synthesis conditions, including the weight ratio of chitosan/aniline, amount of ammonium persulfate (APS), concentration of nitric acid ([HNO3]) and synthesis temperature, on grafting % and electrical conductivity of Chi-g-PANI copolymer was investigated. The synthesized Chi-g-PANI copolymer was characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectrophotometer (UV–Vis), 13C solid-state nuclear magnetic resonance (NMR) spectroscopy, X-ray diffractometer (XRD), field-emittance scanning electron microscope (FE-SEM) and a four-point measurement method. The optimum synthesis condition was identified as the weight ratio of chitosan/aniline = 2, amount of APS = 0.49 g, [HNO3] = 0.1 M and synthesis temperature at 25 °C. The grafting % and electrical conductivity of the Chi-g-PANI copolymer at the optimized conditions were 92% and 8 × 10–3 S/cm, respectively. Results of FTIR and 13C solid-state NMR showed that PANI was successfully grafted onto the molecular chains of chitosan. UV–Vis analysis confirmed that the electronic transition behavior of Chi-g-PANI copolymer was similar to that of PANI. Meanwhile, XRD results revealed the crystallinity of chitosan was destroyed by PANI during copolymerization. Furthermore, FE-SEM results demonstrated that the morphology of the Chi-g-PANI copolymer was obviously different from that of chitosan or PANI.



中文翻译:

导电壳聚糖接枝聚苯胺共聚物:合成与表征

通过化学氧化聚合方法成功合成了壳聚糖-接枝-聚苯胺(Chi-g-PANI)共聚物。壳聚糖/苯胺重量比、过硫酸铵(APS)用量、硝酸([HNO 3 ])浓度、合成温度等各种合成条件对Chi-g-PANI接枝率和电导率的影响共聚物进行了研究。合成的 Chi-g-PANI 共聚物通过傅里叶变换红外光谱 (FTIR)、紫外-可见分光光度计 (UV-Vis)、13C 固态核磁共振 (NMR) 光谱、X 射线衍射仪 (XRD)、场发射扫描电子显微镜 (FE-SEM) 和四点测量方法。最佳合成条件为壳聚糖/苯胺重量比=2,APS用量=0.49g,[HNO 3 ]=0.1 M,合成温度25℃。Chi-g-PANI 共聚物在优化条件下的接枝率和电导率分别为 92% 和 8 × 10 –3 S/cm。FTIR 和13 的结果C 固态 NMR 表明 PANI 成功接枝到壳聚糖的分子链上。UV-Vis 分析证实 Chi-g-PANI 共聚物的电子跃迁行为与 PANI 相似。同时,XRD 结果表明在共聚过程中,聚苯胺破坏了壳聚糖的结晶度。此外,FE-SEM 结果表明 Chi-g-PANI 共聚物的形态与壳聚糖或 PANI 的形态明显不同。

更新日期:2021-07-02
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