Features of forming the structure and properties of polyamide-6 via in situ polymerization with oxidized graphite

Leonov, D. V.; Устинова, Т. П.; Левкина, Н. Л.; Mostovoy, Anton; Lopukhova, Marina

doi:10.1007/s10965-020-02248-5

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…25,27 Although previous studies have demonstrated the effectiveness of some testing methods, they only focused on the polymer where reaction was completed and never on the intermediate product. With the continuous development of reactive processing technology for PA6 in recent years, such as reactive extrusion, [28][29][30][31] reactive injection molding, [32][33][34] reaction rotational molding, 14,35 and so on. The monitoring of the intermediate procedure of monomer conversion into polymer has gained increasing attention.…”

Section: Introductionmentioning

confidence: 99%

An applicability study on various methods for determining the monomer conversion rate of polyamide 6

Gao,

Zhao,

Cai

et al. 2024

J of Applied Polymer Sci

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Anionic ring opening polymerization of ε‐caprolactam (CL) results in the formation of high molecular weight polyamide 6 (PA6) within a few minutes. The monomer conversion rate is an important characterization parameter for polymerization process as well as the end products. This paper used PA6 films with different polymerization degrees as research object for the first time, and systematically compared the performance of four methods for measuring CL conversion rate. The analytical methods were solvent extraction (methanol, ethanol, or water), vacuum removal, thermogravimetric analysis (TGA), and absorbance ratio respectively. For all PA6 products, solvent extraction based on methanol/water and vacuum removal were effective methods for determine their conversion rates. And TGA was only applicable for samples with high degree of polymerization. The CL conversion rate obtained by solvent extraction based on ethanol and absorbance ratio was slightly higher than the real value, especially the latter. Moreover, a new method was discovered and validated during the research process, namely atmospheric devolatilization. The methodology and results in this study can be employed for guiding the production and application of polymers, especially the reactive processing of PA6.

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