Reference

Mathematical model of the effect of diffusion on polymerization kinetics

Mathematical model of the effect of diffusion on polymerization kinetics. Kondelik, Petr (META, Prague, Czech.). Chem. Prum., 34(7), 371-3 (Czech) 1984. CODEN: CHPUA4. ISSN: 0009-2789. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) A math. model is presented and a simple equation is derived for polymn. kinetics taking into account decreasing of the transport rate of monomer mols. to the polymn. centers due to diffusion with increasing polymn. time. This model is suitable for describing solventless polymn. in a system without mixing. The model agreed well with previously published exptl. data on polymn. of caprolactam [105-60-2] with laurolactam [947-04-6].

Carbon-13-NMR sequence analysis

Carbon-13-NMR sequence analysis. XIV. Ternary aliphatic copolyamides. Kricheldorf, Hans R.; Hull, William E. (Inst. Makromol. Chem., Univ. Freiburg, Freiburg/Br., Ger.). J. Macromol. Sci., Chem., A11(12), 2281-92 (English) 1977. CODEN: JMCHBD. ISSN: 0022-233X. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 73 The sequence distribution of ternary copolyamides obtained either by anionic copolymn. of e-caprolactam (I) [105-60-2], w-capryllactam [935-30-8] and w-laurolactam (II) [947-04-6] or by cocondensation of hexamethylenediamine adipate [3323-53-3] with I and II was detd. by 13C NMR. These copolyamides contain 9 different amide groups which were identified by their CO-signals in the 90.5 mHz 13C NMR spectra. From the intensities of the CO signals the ratio of monomer units in the copolymers and the reactivity of the monomers was estd. The av. length of the homogeneous blocks was also calcd.