学术英语写作课程论文

研究生学术英语写作课程论文

题目

专业班级

学号

学生姓名

任课教师

Abstract

Using butyl methacrylates(BMA) as monomer, Span80 as emulsifier, divinyl benzene (DVB) as cross-link agent, ammonium persulfate(APS)/sodium hydrogensulfite(SHS) as redox initiator, the high oil-absorption resin was synthesized by concentrated inverse emulsion polymerization. And the effects of different polymerization technological parameters, such as initiator, crosslinker, emulsifier, on the oil absorbency of high oil-absorption resins were discussed in detail. The result indicated that the absorption of the resin was about (g/g) for and (g/g) for chloroform.

Key words: concentrated inverse emulsion polymerization；oil absorption resin；oil absorption rate

摘要

以甲基丙烯酸正丁酯为单体，二乙烯基苯为交联剂，Span80为乳化剂，过硫酸铵/亚

硫酸氢钠为氧化还原引发剂，采用超浓反相乳液法合成了高吸油性树脂。研究了引发剂用量，交联剂用量，乳化剂用量对树脂吸油性能的影响。所制备的树脂可以吸收自身重倍的甲苯、倍的三氯甲烷。

关键字：超浓反相乳液聚合；吸油性树脂；吸油速率

Contents

1

3

3

3

3

3

4

4

4 5

5

5

6

7

8

8

10

11

1 Introduction

Oil pollution of marine environments is becoming a serious issue. With the growth of the off-shore petroleum industry and the necessity of marine oil transportation. Various methods for the treatment of spilled oil have been tried[1–5]. One of the methods to solve this problem is by using oil absorptive resins, which can collect and remove the oil spilled on water, and some have proved to be highly efficient[6-7].

High oil-absorption resin, being different from traditional oil-absorbing materials, is a new kind of self-swelling oil-absorbing material with many virtues of absorbing large quantity and variety of oils, only absorbing oil from oil/water mixture and high capacity for oil retention, and has a promising future. Synthesis and applications of high oil-absorption resins have very important practical significance for environment protection.

Acrylic has been widely used as monomers to prepare high oil-absorbing resins. Copolymerization of acrylic can be approached by various methods such as emulsion polymerization and suspension polymerization. However, the resins obtained by the above methods universally have some defects of compact structure[8–10]. It is important to select a

suitable technique and optimize the conditions of polymerization for synthesis of workable acrylic copolymer.

Concentrated emulsions are gel-like emulsions in which the volume fraction of the dispersed phase is greater than . The dispersed phase is in the form of spherical or polyhedral cells separated by a continuous-phase network of thin films. Concentrated emulsions have three important characteristics:[11-12] (1) the reduced monomer mobility between cells, because of the presence of a reinforced surfactant layer, can generate an earlier gel effect, which leads to a delay in the bimolecular termination reaction and, therefore, a higher molecular weight; (2) the particle size can be controlled easily by the selection of a suitable surfactant type and concentration; and (3) a polymer containing little water, from which powdery resins are easily formed, can be obtained through concentrated emulsion polymerization.