Copolymerization of methyl 2-acetamidoacrylate and styrene in the presence of stannic chloride |
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| Authors: | Seizo Masuda Keiji MinagawaHirokazu Okamura Masami Tanaka |
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| Institution: | a Department of Chemical Science and Technology, Faculty of Engineering, The University of Tokushima, Minaminosanjima-cho, Tokushima 770-8506, Japan
b Faculty of Pharmaceutical Science, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan |
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| Abstract: | Continuous variation method in UV revealed that methyl N-acetylaminoacrylate (MNA) and SnCl4 formed the 1:1 complex. The copolymerization of MNA with styrene in tetrahydrofuran was carried out at 50 °C in the presence of SnCl4. The resulting monomer reactivity ratios decreased with an increasing concentration of SnCl4 added. This finding suggests that SnCl4 participates in the propagation step of the copolymerization. Therefore, the copolymerization was analyzed by assuming terpolymerization of free MNA (M1), complexed MNA (M2), and styrene (M3). The absolute copolymerization parameters were obtained as follows: k11/k12=0.165, k11/k13=3.04, k22/k21=0.32, k22/k23=0.103, k33/k31=0.058, k33/k32=0.001, Q1=6.03, e1=0.52, Q2=88.57, and e2=2.23. The complexed MNA is more reactive to polymer radicals with free MNA and styrene as the terminal unit than the free MNA. Very small values of k22/k23 and k33/k32 suggests that the copolymerization of the complexed MNA and styrene proceeds alternatingly. |
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| Keywords: | Methyl 2-acetamidoacrylate Styrene Stannic chloride Copolymerization Metal complex Terpolymerization Monomer reactivity ratios |
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