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研究生学术英语写作课程论文
题 e 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 mi*ture 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 pact 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 polyme