Summary: Utilizing the thermal stability of ionic liquid, micrometer‐sized Nylon‐6 particles were successfully prepared by hydrolytic polymerization of ε ‐caprolactam at high temperature with polyvinyl pyrrolidone as stabilizer in ionic liquids, 1‐butyl‐3‐methyl imidazolium tetrafluoroborate, [Bmim][BF 4 ] and N,N‐diethyl‐N‐methyl‐N‐(2‐methoxyethyl)ammonium bis(trifluoro‐methanesulfonyl)amide, [DEME][TFSA]. The obtained particles had a unique shape because Nylon‐6 is a crystalline polymer. Viscosity‐average molecular weights of Nylon‐6 prepared in [Bmim][BF 4 ] and [DEME][TFSA] at 180 °C for 48 h were 4200 and 2200, respectively.
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Minami et al. (2010) studied this question.
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