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Preparative scale synthesis of 1 : 1 alternating copolymers of styrene and methyl methacrylate

Sherrington, D.C. and Slark, A.T. and Taskinen, K.A. (2002) Preparative scale synthesis of 1 : 1 alternating copolymers of styrene and methyl methacrylate. Macromolecular Chemistry and Physics, 203 (10-11). pp. 1427-1435. ISSN 1022-1352

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Abstract

The 1:1 alternating copolymerisation of styrene (St) and methyl methacrylate (MMA) in toluene and methylene chloride in the presence of Lewis acids (Et1.5AlCl1.5, ZnCl2, Br-3 and BCl3) has been re-visited with a view to loping a high yielding preparative procedure. Only photo-irradiation in the presence of BCl3 offered the prospect of clean and high conversions. Manipulation of the temperature, comonomer concentration and the comonomer: ratio has allowed yields of 1:1 alternating copolymer aching 100% to be achieved. BCl3 is required only at catalytic levels and so the Lewis acid does turnover in the course of the reactions. Astonishingly the molecular weights of the product, turn out to be very high for a solution polymerisation, with (M) over bar (w) up to ca. 2 000 k being readily cued. Furthermore, the molecular weight was shown to with conversion and in many cases the molecular it distributions are narrow. Though there are some features of a free radical mechanism, the process is more complex with side reactions possibly contributing to the growth in molecular weight. Overall use of BCl3 with photo-irradiation does offer a viable preparative route to exploitable quantities of 1:1 alternating St/MMA copolymers.

Item type: Article
ID code: 484
Keywords: alternating copolymerization, Lewis acid, photopolymerization, Chemistry, Materials Chemistry, Organic Chemistry, Polymers and Plastics, Physical and Theoretical Chemistry, Condensed Matter Physics
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Mr Derek Boyle
    Date Deposited: 09 Mar 2006
    Last modified: 04 Sep 2014 11:23
    URI: http://strathprints.strath.ac.uk/id/eprint/484

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