Pulsed NMR Study of Network Formation in the Course of Bulk Polymerization of Methyl Acrylate
作者： Hiroki KIMOTO , Atsuko FUKUDA , Atsushi ASANO , Takuzo KUROTSU
关键词: Polymer 、 Kinetic chain length 、 Chemistry 、 End-group 、 Methyl acrylate 、 Polymer chemistry 、 Side chain 、 Bulk polymerization 、 Physical chemistry 、 Polymerization 、 Living polymerization
摘要: The proton spin-spin relaxation time (T2) during the bulk polymerization of methyl acrylate was measured as a function reaction at various temperatures. Three kinds T2 (T2L (long), T2S (short) and T2M (intermediate)) were obtained proceeded. fraction (FS) increased sigmoidally certain time, while that T2L (FL) decreased reciprocally. former corresponded to amount polymer whose molecular weight sufficiently high enough cause tight entanglement produced transient network structure; latter reflected decrease in mixture monomer low polymer. is considered arise from relatively mobile region entanglement. relationship between fractions + yield found be linear, which led us monitor real non-distractive manner. 13C DD (dipolar decoupling)/MAS (magic angle spinning) NMR spectra also process terms motions main chain side formation structure. DD/MAS show motion became restricted well when “Trommosdorff effect” (gel effect) observed, part monomers trapped
sci-hub.se 参考文章(16)
R. Folland, A. Charlesby, Entanglement effects on the NMR spin-spin relaxation in polyethylene melts Journal of Polymer Science: Polymer Letters Edition. ,vol. 16, pp. 339- 344 ,(1978) , 10.1002/POL.1978.130160705
S. K. Soh, D. C. Sundberg, Diffusion‐controlled vinyl polymerization. II. Limitations on the gel effect Journal of Polymer Science Part A. ,vol. 20, pp. 1315- 1329 ,(1982) , 10.1002/POL.1982.170200514
Takuzo Kurotu, Pulsed NMR Investigation on the Polymerization II. Bulk Polymerization of Methacrylic Acid Polymer Journal. ,vol. 19, pp. 285- 288 ,(1987) , 10.1295/POLYMJ.19.285
Kunihiko Fujimoto, Toshio Nishi, Ryoichi Kado, Multiple-Pulse Nuclear Magnetic Resonance Experiments on Some Crystalline Polymers Polymer Journal. ,vol. 3, pp. 448- 462 ,(1972) , 10.1295/POLYMJ.3.448
S. K. Soh, D. C. Sundberg, Diffusion‐controlled vinyl polymerization. IV. Comparison of theory and experiment Journal of Polymer Science Part A. ,vol. 20, pp. 1345- 1371 ,(1982) , 10.1002/POL.1982.170200516
Hajime Serizawa, Masayoshi Ito, Tetsuo Kanamoto, Koji Tanaka, Akimasa Nomura, Structural Changes during Mechanical Mixing in Carbon Black-Natural Rubber Systems Studied by Pulsed NMR Polymer Journal. ,vol. 14, pp. 149- 154 ,(1982) , 10.1295/POLYMJ.14.149
R. Folland, A. Charlesby, Pulsed n.m.r. of cis-polyisoprene: 2 Polymer. ,vol. 20, pp. 211- 214 ,(1979) , 10.1016/0032-3861(79)90224-6
Hiroshi Tanaka, Proton spin-lattice and spin-spin relaxation times in isotactic polypropylene. II. Effects of stretching ratio and temperature Journal of Applied Polymer Science. ,vol. 28, pp. 1707- 1715 ,(1983) , 10.1002/APP.1983.070280514
Hajime Tanaka, Toshio Nishi, Study of crystallization process of polymer from melt by a real-time pulsed NMR measurement Journal of Chemical Physics. ,vol. 85, pp. 6197- 6209 ,(1986) , 10.1063/1.451850
Takuzo Kurotu, Pulsed NMR Investigation on the Polymerization of Methyl Methacrylate Polymer Journal. ,vol. 18, pp. 859- 864 ,(1986) , 10.1295/POLYMJ.18.859