Reference

Polymerization of lactams

Polymerization of lactams. VIII. Anionic heterogeneous polymerization of 6-caprolactam in solution. Kubanek, Vladimir; Kralicek, Jaroslav; Moucha, Antonin (Inst. Polym., Prague Inst. Chem. Technol., Prague, Czech.). Sb. Vys. Sk. Chem.-Technol. Praze, Org. Chem. Technol., C 24, 9-16 (German) 1976. CODEN: SVOCAF. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) In the prepn. of polycaprolactam [25038-54-4] in toluene and PhCl with Na bis(2-methoxyethoxy)dihydroaluminate [22722-98-1], the size and shape of the polymer particles depended on the stirring rate and the solvent, and the temp. and concn. of catalyst components had little influence. A high stirring rate gave small particles with relatively irregular shapes (<300.mu.). The polymn. in toluene gave spherical particles, and polymn. in PhCl gave smaller, irregular particles.

New catalysts in anionic polymerization of caprolactam

New catalysts in anionic polymerization of caprolactam. Ostaszewski, Bogdan; Wlodarczyk, Miroslaw; Wlodarczyk, Karol (Politech. Lodz, Lodz, Pol.). Zesz. Nauk. Politech. Lodz., Chem., 32, 136 (Polish) 1976. CODEN: ZNPLAY. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Caprolactam [105-60-2] was polymd. in the presence of sodium dihydrobis(2-methoxyethoxy)aluminate (I) [22722-98-1] as catalyst and tolylene diisocyanate [26471-62-5] as activator. I was suitable for effecting the polymn. below the m.p. of polycaprolactam.