Characterization of alkali-lignin-grafted polyacrylamide synthesized by atom transfer radical polymerization
Characterization of alkali-lignin-grafted polyacrylamide synthesized by atom transfer radical polymerization
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原子转移自由基聚合合成碱木质素接枝聚丙烯酰胺的表征
DOI：
10.1080/02773813.2021.2015388
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发表时间：
2021-12
影响因子：
2
通讯作者：
Liu Y
中科院分区：
文献类型：
--
作者：
Wang FF;Zhang YR;Su Y;Zhang D;Xia NN;Sun YY;Liu Y
摘要 利用工业木质素制备高附加值、化学改性的木质素基共聚物对于绿色和可持续发展至关重要。在此，我们通过原子转移自由基聚合（ATRP）合成了碱木质素接枝聚丙烯酰胺。由于碱木质素(AL)的总羟基含量最高，采用2-溴异丁酰溴对其进行改性，合成不同[AL中OH基]:[TEA]:[BiBB] = 1:1:1、1:1.5:1.5和1:2:2比例的木质素大引发剂(木质素-Br)。丙烯酰胺是通过 ATRP 从具有最多 Br 引发位点的木质素-Br 接枝的。所用单体与木质素-Br的比例为50:1、100:1和200:1，合成的共聚物(L-g-PAM)分别表示为L-g-PAM50、L-g-PAM100和L-g-PAM200。这些共聚物通过傅里叶变换红外 (FT-IR) 和 1H 核磁共振 (NMR) 光谱进行了表征。 FT-IR 和 1H NMR 结果表明，所有 L-g-PAM 共聚物的木质素主链中都引入了聚丙烯酰胺。 L-g-PAM的凝胶渗透色谱显示L-g-PAM200的M w 最高，为427,383g/mol。 L-g-PAM 的照片和扫描电子显微镜图像表明，L-g-PAM 呈柔软的海绵状，并含有交织的纤维。 L-g-PAM 的最大降解温度 (T max) 随着单体与木质素-Br 比率的增加而增加。此外，L-g-PAM的玻璃化转变温度（T g）高于AL。在我们的研究中，通过 ATRP 合成的碱木质素接枝聚丙烯酰胺具有较窄的分子量分布，其柔软的海绵特性使其成为水凝胶或其他表面活性剂。
Abstract The preparation of value-added, chemically modified lignin-based copolymers for the use of technical lignin is crucial for green and sustainable development. Herein, we synthesized alkali-lignin-grafted polyacrylamide by atom transfer radical polymerization (ATRP). As alkali lignin (AL) has the highest total hydroxyl group content, it was modified with 2-bromoisobutyryl bromide to synthesize a lignin macroinitiator (lignin-Br) at different ratios of [OH group in AL]:[TEA]:[BiBB] = 1:1:1, 1:1.5:1.5, and 1:2:2. Acrylamide was grafted from lignin-Br with the most Br-initiating sites via ATRP. The ratios of monomer to lignin-Br used were 50:1, 100:1, and 200:1, and the synthesized copolymers (L-g-PAM) were denoted as L-g-PAM50, L-g-PAM100, and L-g-PAM200, respectively. These copolymers were characterized by Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (NMR) spectroscopies. The FT-IR and 1H NMR results indicated that polyacrylamide was introduced into the lignin backbone of all L-g-PAM copolymers. Gel permeation chromatography of L-g-PAM showed that the M w of L-g-PAM200 was the highest at 427,383 g/mol. Photographs and scanning electron microscopy images of L-g-PAM showed that L-g-PAM appeared as a soft sponge and contained interwoven fibers. The maximum degradation temperature (T max) of L-g-PAM increased with increasing monomer-to-lignin-Br ratio. Moreover, the glass transition temperature (T g) of L-g-PAM was higher than that of AL. The alkali-lignin-grafted polyacrylamide, synthesized by ATRP, in our study has a narrow molecular weight distribution, and its soft sponge properties make it a hydrogel or another surfactant.
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影响因子：
8.4
作者：
B. Shrestha;Y. L. Brech;Thierry Ghislain;S. Leclerc;V. Carré;F. Aubriet;S. Hoppe;P. Marchal;S. Pontvianne;N. Brosse;A. Dufour
通讯作者：
B. Shrestha;Y. L. Brech;Thierry Ghislain;S. Leclerc;V. Carré;F. Aubriet;S. Hoppe;P. Marchal;S. Pontvianne;N. Brosse;A. Dufour
DOI：
10.1515/hf.2001.047
发表时间：
2001-04
期刊：
--
影响因子：
--
作者：
M. Zawadzki;A. Ragauskas
通讯作者：
M. Zawadzki;A. Ragauskas
影响因子：
1.5
作者：
Fangfang Wang;Mingqiang Ai;F. Huang
通讯作者：
Fangfang Wang;Mingqiang Ai;F. Huang
影响因子：
8.4
作者：
Kai, Dan;Low, Zhi Wei;Loh, Xian Jun
通讯作者：
Loh, Xian Jun
影响因子：
6.2
作者：
Guangzheng Gao;James Ian Dallmeyer;J. Kadla
通讯作者：
Guangzheng Gao;James Ian Dallmeyer;J. Kadla