Catalytic esterification of polyoxypropylene glycols applied in reaction injection moulding block copolyamide synthesis

Kotel’nikov, V. A.; Persits, I. E.; Surin, N. N.; Danilevskaya, L. B.; Sekiguchi, Hikaru; Bui, Ch.

doi:10.1016/0014-3057(95)00188-3

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Various methods have been proposed to determine the conversion of CL. They include gravimetry,3, 12, 13, 18–27 gas chromatography,28, 29 enthalpy of polymerization,4, 30 and in‐line infrared spectroscopy 31. Among them, the gravimetry is used the most.…”

Section: Introductionmentioning

confidence: 99%

Anionic polymerization of lactams: A comparative study on various methods of measuring the conversion of ε‐caprolactam to polyamide 6

Zhang

2006

J of Applied Polymer Sci

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Anionic ring-opening polymerization of lactams leads to the formation of poly(lactams) or polyamides. This work aimed at comparing the performance of four methods for measuring the conversion of -caprolactam (CL) to polyamide 6. The latter was either a homopolymer (PA6) or grafts onto polystyrene (PS-g-PA6 graft copolymer). Those four methods were mass balance based on solvent extraction (methanol, water, THF, or acetone), mass balance based on vacuum drying at 140°C, thermogravimetric analysis (TGA), and elemental analysis based on nitrogen. The mass balances based on methanol extraction and vacuum drying at 140°C and TGA were all suitable for measuring the conversion of CL, whether the resulting polymer was the PA6 or PS-g-PA6. The mass balance based on water extraction was good for the PA6 and not good for the PS-g-PA6. The elemental analysis based on nitrogen was not suitable for the PA6 nor for the PS-g-PA6.

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Section: Introductionmentioning

confidence: 99%

Anionic polymerization of lactams: A comparative study on various methods of measuring the conversion of ε‐caprolactam to polyamide 6

Zhang

2006

J of Applied Polymer Sci

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“…The untreated extraction residue did not contain phosphorus, and the phosphorus content of P-SR WA (32.0 mg P g −1 ) was clearly higher than that of P-SR WOA (8.5 mg P g −1 ). The hydrogen chloride produced by the reaction of phosphoryl chloride and compound which has OH group catalyzes hydrolysis of the phosphoric ester [27,28]. The extraction residue also contains the compound which has OH group such as glucose and cellulose, therefore, the presence of a tertiary amine is necessary to remove the hydrogen chloride.…”

Section: Resultsmentioning

confidence: 99%

Cadmium sorption characteristics of phosphorylated sago starch-extraction residue

Igura

Okazaki

2010

Journal of Hazardous Materials

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“…Several methods have been proposed to determine the conversion rate of CL. They include gravimetry, [16][17][18][19][20][21] gas chromatography, 22,23 enthalpy of polymerization, 10,24 and so forth. Among them, the gravimetry is favored by the majority of researchers because of its easy realization and stable result.…”

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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Catalytic esterification of polyoxypropylene glycols applied in reaction injection moulding block copolyamide synthesis

Cited by 4 publications

References 3 publications

Anionic polymerization of lactams: A comparative study on various methods of measuring the conversion of ε‐caprolactam to polyamide 6

Anionic polymerization of lactams: A comparative study on various methods of measuring the conversion of ε‐caprolactam to polyamide 6

Cadmium sorption characteristics of phosphorylated sago starch-extraction residue

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

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