Crystallization behavior of nylon 6 nanocomposites (Record no. 41493)

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control field MX-MdCICY
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control field 20250625124656.0
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Transcribing agency CICY
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-7162
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245 10 - TITLE STATEMENT
Title Crystallization behavior of nylon 6 nanocomposites
490 0# - SERIES STATEMENT
Volume/sequential designation Polymer, 44, p.3945-3961, 2003
520 3# - SUMMARY, ETC.
Summary, etc. The crystallization behavior of nylon 6 nanocomposites formed by melt processing was investigated. Nanocomposites were produced by extruding mixtures of organically modified montmorillonite and molten nylon 6 using a twin screw extruder. Isothermal and non-isothermal crystallization studies involving differential scanning calorimetry (DSC)were conducted on samples to understand how organoclay concentration and degree of clay platelet exfoliation influence the kinetics of polyamide crystallization. Very low levels of clay result in dramatic increases in crystallization kinetics relative to extruded pure polyamide. However, increasing the concentration of clay beyond these levels retards the rate of crystallization. For the pure nylon 6, the rate of crystallization decreases with increasing the molecular weight as expected; however, the largest enhancement in crystallization rate was observed for nanocomposites based on high molecular weight polyamides; this is believed to stem from a higher degree of platelet exfoliation in these nanocomposites. Wide angle X-ray diffraction (WAXD)and DSC were further used to characterize the polymer crystalline morphology of injection molded nanocomposites. The outer or skin layer of molded specimens was found to contain only g-crystals; whereas, the central or core region contains both the a and g-forms. The presence of clay enhanced the g-structure in the skin; however, the clay has little effect on crystal structure in the core. Interestingly, higher levels of crystallinity were observed in the skin than in the core for the nanocomposites, while the opposite was true for the pure polyamides. In general, increasing the polymer matrix molecular weight resulted in a lower degree of crystallinity in molded samples as might be expected.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Fornes, T.D.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Paul, D.R.
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Uniform Resource Identifier <a href="https://drive.google.com/file/d/1qbvmrs-NIFBML63I7kU3cRJot78kO9t_/view?usp=drivesdk">https://drive.google.com/file/d/1qbvmrs-NIFBML63I7kU3cRJot78kO9t_/view?usp=drivesdk</a>
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