4.6 Article

Novel pathway to produce high molecular weight kraft lignin-acrylic acid polymers in acidic suspension systems

期刊

RSC ADVANCES
卷 8, 期 22, 页码 12322-12336

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra12971h

关键词

-

资金

  1. NSERC, Canada
  2. Canada Foundation for Innovation (CFI)
  3. Ontario government
  4. FPInnovations

向作者/读者索取更多资源

Kraft lignin (KL) produced in kraft pulping process has a low molecular weight and solubility, which limits its application in industry. For the first time, KL was polymerized with acrylic acid (AA) in an acidic aqueous suspension system to produce a water soluble lignin-AA polymer with a high molecular weight in this work. The polymerization reaction was carried out using K2S2O8 as an initiator, and the influence of reaction conditions on the carboxylate group content and molecular weight of resultant lignin polymers was systematically investigated. The mechanism of polymerization of KL and AA was discussed fundamentally. The resulting lignin-AA polymer was characterized by Fourier Transform Infrared spectrophotometry (FTIR), proton nuclear magnetic resonance (1H-NMR) and elemental analyses. The results showed that the phenolic hydroxyl group (Ph-OH) content of KL promoted the polymerization under an acidic environment. Under the conditions of 1.5 wt% of initiator, 3.5 of pH, 10.0 of AA/lignin molar ratio, 0.15 mol L-1 of lignin concentration, 3 h and 80 degrees C, the carboxylate group content and the molecular weight of the polymer were 7.37 mmol g(-1) and 7.4 x 105 g mol(-1), respectively. The lignin-AA polymer was water soluble at a 10 g L-1 concentration and a pH higher than 4.5. Furthermore, the flocculation performance of lignin-AA polymer in an aluminium oxide suspension was evaluated. Compared with polyAA, the lignin-AA polymer was a more efficient flocculant for aluminium oxide suspension, which shows its potential to be used as a green flocculant in industry.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据