Methyl Methacrylate and Alpha-Methylstyrene: New Strategy for Synthesis of Bloc Copolymers for Use in Potential Biomedical Applications Generated by an Ecologic Catalyst Called Maghnite (Algerian MMT)

被引:4
作者
Ayat, Moulkheir [1 ]
Belbachir, Mohamed [1 ]
Rahmouni, Abdelkader [1 ]
机构
[1] Oran1 Univ Ahmed Benbella, Dept Chem, Polymer Chem Lab, Fac Sci, BP 1524, El Mnouar 31000, Oran, Algeria
关键词
catalyst; clay; Na-montmorillonite; cationic copolymerization; methyl methacrylate; alpha-methyl styrene; block copolymerization; mechanism;
D O I
10.9767/bcrec.11.3.571.316-329
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A new model for synthesis of the plastics, block copolymers were prepared from methyl methacrylate (MMA) and alpha-methyl styrene (alpha-MS) by cationic copolymerization in the presence of a new and efficient catalyst of "Maghnite-Na" at 0 degrees C in bulk. In this paper, the copolymerization of alpha-MS and MMA was induced in heterogeneous phase catalyzed by Maghnite-Na was investigated under suitable conditions. The "Maghnite-Na" is a montmorillonite sheet silicate clay, with exchanged sodium cations to produce Na-Montmorillonite (Na+-MMT) obtained from Tlemcen, Algeria, was investigated to remove heavy metal ion from wastewater as an efficient catalyst for cationic polymerization of many vinylic and heterocyclic monomers. The synthesized copolymer were characterized by Nuclear Magnetic Resonance (NMR-H-1, NMR-C-13), FT-IR spectroscopy, Differential Scanning Calorimetry (DSC), and Gel Permeation Chromatography (GPC) to elucidate structural characteristics and thermal properties of the resulting copolymers. The structure compositions of "MMT", "H+-MMT" and "Na+-MMT" have been developed. The effect of the MMA/alpha-MS molar ratio on the rate of copolymerization, the amount of catalyst, temperature and time of copolymerization on yield of copolymers was studied. The yield of copolymerization depends on the amount of Na+-MMT used and the reaction time. The kinetic studies indicated that the polymerization rate is first order with respect to monomer concentration. A possible mechanism of this cationic polymerization is discussed based on the results of the H-1-NMR Spectroscopic analysis of these model reactions. A cationic mechanism for the reaction studies showed that monomer was inserted into the growing chains. Copyright (C) 2016 BCREC GROUP. All rights reserved
引用
收藏
页码:316 / 329
页数:14
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