Preparation of a Novel Flocculant Polyacrylamide with Low Polydispersity and Tacticity

Xiao-long GU; Jian-guo JIANG

您当前的位置：

首页 >

文章列表页 >

Preparation of a Novel Flocculant Polyacrylamide with Low Polydispersity and Tacticity

更新时间：2022-09-18

- Preparation of a Novel Flocculant Polyacrylamide with Low Polydispersity and Tacticity
- Polymer Bulletin Vol. 27, Issue 6, Pages: 81-87(2014)
- 作者机构：
  
  扬州职业大学生物与化工工程学院，扬州　225009
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014-06，
  
  Received：03 July 2013，
  
  Revised：15 December 2013，
扫描看全文
Xiao-long GU, Jian-guo JIANG. Preparation of a Novel Flocculant Polyacrylamide with Low Polydispersity and Tacticity. [J]. Polymer Bulletin 27(6):81-87(2014)
DOI：

Xiao-long GU, Jian-guo JIANG. Preparation of a Novel Flocculant Polyacrylamide with Low Polydispersity and Tacticity. [J]. Polymer Bulletin 27(6):81-87(2014) DOI：

摘要

在开发新的原子转移自由基引发催化体系合成同时具有窄分子量分布和一定立构规整度的絮凝剂聚丙烯酰胺方面进行了探索。以氯乙酸作为引发剂，CuCl/四甲基乙二胺(TMEDA)为催化络合剂，在聚合体系中分别引入Lewis酸Y(OTf)

和AlCl

作为定向聚合控制剂，研究了 Lewis酸的加入对最终产物的等规度和ATRP聚合进程的影响。通过探索反应物种配比、溶剂介质和温度对聚合的影响，得到了最优化的聚合结果：最终产物聚丙烯酰胺絮凝剂的立构规整度

~76%，分子量分布指数

~1.03。进一步动力学研究表明，在有Lewis酸参与的情况下，丙烯酰胺的聚合以ATRP机理进行。对所得的高聚物絮凝剂聚丙烯酰胺进行絮凝实验，结果显示，高分子絮凝剂的沉淀效率η值与高聚物的数均分子量

、分子量分布指数PDI值以及立构规整度

值有关，其中絮凝剂数均分子量

对絮凝效率起决定性作用，而且，絮凝剂具有较低的分子量分布指数PDI值和较大的立构规整度

都有利于絮凝效率的提高。

Abstract

A typical atom transfer radical polymerization (ATRP) system for preparing a novel flocculant polyacrylamide with low polydispersity and tacticity was studied in this paper. Lewis acids Y(OTf)

and AlCl

were introduced respectively as stereospecific reagent in the ATRP of acrylamide with chloroacetic acid as initiator and CuCl/TMEDA as catalyst. The influence of certain amount of the added Lewis acids on the rate and controllability of polymerization was studied. The participation of the Lewis acid AlCl

in the polymerization afforded the resultant polyacrylamides with lower polydispersity index 1. 03 and well-controlled tacticity with

meso

content 76% under the optimum reaction condition used. Kinetic experiments also revealed the polymerization of acrylamide in presence of Lewis acid proceeded with an ATRP process. Furthermore

the obtained flocculants were introduced in the flocculation experiments to testify their flocculation efficiency

which indicated that the flocculation efficiency of the polymer flocculants were dependent upon molecular weight (

)

polydispersity index (PDI) and

meso

content (

) of the polymer flocculants. The molecular weight of the flocculants played a critical role in influencing on flocculation efficiency

on the other hand

the narrower of PDI and the higher meso content of the polymer would be beneficial to improving the flocculation efficiency.

关键词

原子转移自由基聚合聚丙烯酰胺立构规整度絮凝剂

Keywords

Atom transfer radical polymerization(ATRP)PolyacrylamideTacticityFlocculant

references

更多指标>

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Research Progress in Preparation of Modified Natural Polymer Flocculants

Study on Mechanism and Thermodynamics of Tannin Adsorption from Aqueous Solution onto Marcroporous Crosslinked Poly(N-methyl-acrylamide) Resin

Polyacrylamide Structure and Viscosity Retention Rate of Aqueous Solution

Application of Ionic Liquid in Atom Transfer Radical Polymerization

Progress in Polyacrylamide Nanocomposite Hydrogels

Related Author

No data

Related Institution

Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education, School of Chemistry Engineering,Xinjiang University

Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education,Xinjiang University

Hunan Polytechnic of Environment and Biology

College of Chemistry and Chemical Engineering , Beifang University of Nationalities , Key Laboratory of Chemical , Engineering and Technology of State Ethnic Affairs Commission

Department of Polymer Science and Technology, College of Chemistry, Chemical Engineering and Materials Science, Soochow University

⁰