Specific Heat of Synthetic High Polymers. IV. Polycaprolactam.

Marx, Paul C.; Smith, Connor; Worthington, A. E.; Dole, Malcolm

doi:10.1021/j150532a005

Cited by 47 publications

(5 citation statements)

References 1 publication

(1 reference statement)

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“…To clarify the effect of PPD‐T on the X c of matrix nylon‐6, DSC was undertaken, which is generally used to determine the X c of nylon‐6 12. The X c of nylon‐6 and that in a composite state was calculated by the following equation where Δ H f , Δ H fo , and C represent the heat of fusion of a specimen, the heat fusion of nylon‐6 with 100% crystallinity (45 cal/g),13, 25 and the content of nylon‐6 in weight, respectively. …”

Section: Resultsmentioning

confidence: 99%

Molecular composites prepared by in situ direct synthesis of wholly aromatic rigid‐rod polyamides via the phosphorylation reaction in a dissolved nylon‐6 matrix

Idemura

Preston

2003

J. Polym. Sci. A Polym. Chem.

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Wholly aromatic rigid-rod polyamides such as poly(p-phenyleneterephthalamide) (PPD-T) were synthesized in situ in a solution of nylon-6 via the phosphorylation polycondensation method to form nanocomposites or so-called "molecular composites." The incorporation of PPD-T into a nylon-6 matrix was achieved by this approach in a more compatibilized form than that obtained by the conventional coagulation method that entails precipitation of a blend of PPD-T and nylon-6 in a solvent, for example, concentrated sulfuric acid. Gelation occurred during the synthesis, presumably because of the formation of interpenetrating networks accompanied by some block-copolymer formation. The transparency and tensile properties of the resultant composite films from the rigid-rod aromatic polyamide/nylon-6 combination were improved over those of nylon-6 film alone. Rainbow-colored intense birefringence was observed for the composite films under crossed polarizers. These properties are discussed in context with the in situ synthesized rigid-rod polyamides uniformly incorporated in nylon-6.

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Section: Resultsmentioning

confidence: 99%

Molecular composites prepared by in situ direct synthesis of wholly aromatic rigid‐rod polyamides via the phosphorylation reaction in a dissolved nylon‐6 matrix

Idemura

Preston

2003

J. Polym. Sci. A Polym. Chem.

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“…If one assumes that åH values for the two similar nylon forms are reasonably close together, as shown by Dole and coworkers [ 17 ] , the difference in T~ I values arises from substantial differences between entropy of fusion [ 10] . F%.…”

Section: Molecukw Structurementioning

confidence: 88%

Nylon 6—Current Developments

Nesty¹

1959

Textile Research Journal

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Epsilon polycaproamide (nylon 6), with more than twenty years' effort behind it in Europe, is now established as a commercial fiber in the U.S. Historically, its development goes back at least sixty years, when it narrowly missed becoming the first truly man-made fiber. Although the molecular structure of nylon 6 is almost identical to that of nylon 6,6, its melting point is lower, probably due to special entropy considerations. Thus nylon 6 permits easier and more economical thermal processing. Thermal properties of the two nylons, even when both are modified with antioxidants, are seen to be similar in many respects, but the 6 type has more resistance to thermal creep at high loads and is more stable with respect to end-group changes. A major domestic producer has developed technology solving the old problem of excessive monomer content without resorting to washing of yarn. Properties, applications, and current developments of various forms of nylon 6 fibers are described. A large potential is shown to exist for expanded use of this versatile fiber.

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“…The subscript r designates the resin. For numerical results in this article, we have considered the following values obtained experimentally [11][12][13] H R is the PA-6 melting enthalpy with the value of 188,400 J/kg and k is the thermal conductivity with the value of 0.25 W/mK.…”

Section: Cure and Rheology Modellingmentioning

confidence: 99%

“…This autocatalytic function is used for thermoset reactions and is applied to describe the polymerisation behaviour of APA-6. The kinetic parameters used in equation (12) and Figure 3 were calculated experimentally as in the work by Teuwen et al and are presented in Table 1. 17 During anionic polymerization, there is an increase in the caprolactam viscosity , and a rheological test must be carried out to obtain the numerical model.…”

Section: Cure and Rheology Modellingmentioning

confidence: 99%

A numerical simulation of woven/anionic polyamide 6 composite part manufacturing using structural reactive injection moulding process

García-Manrique

Hoto

Gascón

et al. 2014

Journal of Thermoplastic Composite Materials

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In this work, a structural reactive injection moulding process using reactive anionic polyamide 6 (APA-6) is studied. Semi-empirical equations for the prediction of the APA-6 reaction kinetics and an advection equation for void transport are used in the numerical scheme. A complex numerical simulation of reactive injection of "-caprolactam was developed for a three-dimensional industrial part. The validity of the approach is demonstrated for determining an effective injection strategy, including the position of vents and gates and the most effective parameter values for minimum mould filling time without the formation of voids.

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Specific Heat of Synthetic High Polymers. IV. Polycaprolactam.

Cited by 47 publications

References 1 publication

Molecular composites prepared by in situ direct synthesis of wholly aromatic rigid‐rod polyamides via the phosphorylation reaction in a dissolved nylon‐6 matrix

Molecular composites prepared by in situ direct synthesis of wholly aromatic rigid‐rod polyamides via the phosphorylation reaction in a dissolved nylon‐6 matrix

Nylon 6—Current Developments

A numerical simulation of woven/anionic polyamide 6 composite part manufacturing using structural reactive injection moulding process

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