Synthesis and properties of star-branched nylon 6

Warakomski, John M.

doi:10.1021/cm00023a014

Cited by 28 publications

(22 citation statements)

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“…Therefore, the existence of a star-branched structure could be demonstrated by comparison of the properties [6,[10][11][12][13]19]. [10]. The difference in RV indicated the formation of a star-branched structure.…”

Section: Resultsmentioning

confidence: 99%

“…RV, FTIR, DSC and XRD analyses provided indirect evidence to confirm the existence of a star-branched structure according to the pioneer work about star-branched polyamide 6 [6,[10][11][12][13]19]. The direct proof such as NMR and MALDI TOF MS was still challenging due to the low solubility and high viscosity of SPA6 [23].…”

Section: Resultsmentioning

confidence: 99%

“…Various synthetic routes to SPA6 have been established through different polymerization mechanisms. Cationic ring-opening polymerization (ROP) of e-caprolactam (CL) with starburst poly(ethylenimine) as an initiator was used to prepare six-arm SPA6 [10]. The resultant polymer showed decreased viscosity in the melt and in solution and retained mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Zhu

Gong

Han

et al. 2015

Chinese Chemical Letters

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Zhu

Gong

Han

et al. 2015

Chinese Chemical Letters

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“…An example of star polyesters and polyamides forming from dendrimer cores is star-branched polycaprolactones, obtained from polypropylenimine dendrimers and caprolactone or polycaprolactone and polycaprolactam. 5 J. M. Warakomski has described 6 the preparation of star-branched poly(-caprolactam) based on polyethylene imines of different generation as a core and initiator for the ring-opening polymerization of -caprolactam. There are also mentioned two other methods of poly(-caprolactam) preparation: (1) starting from a core molecule with several carboxy acid sites, on which a star-branched polymer is formed by means of ring-opening polymerization, and, (2) from tris caprolactam as a core molecule and anionic polymerization of -caprolactam.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of star‐branched PA12 grafted onto PEi core molecule

Baumann¹,

Haeger²,

Novikova³

et al. 2005

J of Applied Polymer Sci

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Synthesis of PEi-g-PA12 with concentration of PEi 2-40 wt % was fulfilled in two different ways, as ring-opening polymerization of LL and transamidation of linear PA12 in the presence of core PEi molecules. Both methods provide almost uniform materials. Obtained samples were characterized using different techniques: solution and melt viscosity, molecular weight and molecular weight distribution of star polymers and PA12 "arms" with different content of cores, as well as melt and glass transition measurements, were fulfilled. For clarification of PEi-g-PA12 structure and mechanism of grafting, bis-(hexamethylen)triamin and tris(2-aminoethyl)amin were used as a model core molecules. Participation of not only the primary but also the secondary and tertiary amino groups in the formation of PEi-g-PA12 polymers (until 2-8 wt % of PEi content) have been established. At higher content of PEi (8 -15 wt %), only primary amino groups of core molecules take part in grafting.

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“…Highly branched PEi‐ g ‐PA12 belongs to the class of star‐branched polyamides, which are, despite their other interesting properties,1, 4–6 objects of interest for future chemical modifications. For many chemical modifications, it is important to know the concentration of primary amino groups, which are also the end groups of the PA12 arms.…”

Section: Introductionmentioning

confidence: 99%

Method for the determination of primary, secondary, and tertiary amino groups in star‐shaped polyamide 12 with a poly(ethylene imine) core

Baumann¹,

Haeger²,

Novikova³

et al. 2004

J of Applied Polymer Sci

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A star-branched poly(ethylene imine)-gpolyamide 12 with a high concentration of primary amino end groups is an object of interest for future chemical modifications. In many cases, the concentration of primary amino groups, which are also the end groups of the polyamide 12 arms, and the concentrations of secondary and tertiary amino groups in a sample need to be known independently. Because of the difference in the reactivity of phthalic acid toward amino groups, its reaction with poly-(ethylene imine)-g-polyamide 12 can be used for the analytical determination of these groups. With primary amino groups, phthalic acid forms phthalimido moieties, which are detectable by IR spectroscopy. The IR bands can be used for quantitative analysis with an appropriate calibration procedure. The concentration of primary amino groups can also be calculated as the difference between the concentration of all types of amino groups before the reaction with phthalic acid and the final concentration of amino and carboxylic groups after the reaction. The final concentration of the amino groups is equal to the concentration of unreacted tertiary amino groups after the reaction with phthalic acid anhydride. The difference between the final concentration of carboxylic groups and the initial concentration of carboxylic groups is equivalent to the concentration of secondary amino groups, which react with phthalic acid to form phthalamido acid moieties.

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Synthesis and properties of star-branched nylon 6

Cited by 28 publications

References 0 publications

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N , N′ , N″ -trimesoyltricaprolactam as a multifunctional activator

Synthesis and characterization of star‐branched PA12 grafted onto PEi core molecule

Method for the determination of primary, secondary, and tertiary amino groups in star‐shaped polyamide 12 with a poly(ethylene imine) core

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