• Journal of the Korean Society of Industry Convergence
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• v.12 no.1
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• pp.5-10
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• 2009

The Nylon/clay nanocomposite were prepared with Cloisite25A and Cloisite30B. And mechanical properties and thermal properties of Nylon/clay nanocomposites on the amount of MMT have been investigated. From the results of XRD and TEM, we found that mono layered silicates were dispersed in polymer matrix and those resultants were exfoliated nanocomposites. When Cloisite30B was used as an intercalant in the Nylon/Clay nanocomposites, the mechanical and thermal properties of Nylon were higher than those with Cloisite25A.

• Macromolecular Research
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• v.13 no.5
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• pp.367-372
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• 2005

As a preliminary work for the preparation of nylon 6/c1ay nanocomposites by reactive extrusion, nylon 6/c1ay nanocomposites were prepared by anionic polymerization in a flask. In order to investigate the effect of the intercalation of clay layers, the clay feeding times, such as in pre-mixing where the clay was fed before initiation of polymerization and in after-mixing method where the clay was fed after initiation of polymerization, were changed. The appearance of the WAXD peak of nanocomposites prepared by the pre-mixing method was obvious and the tensile strength was decreased compared with that of pure nylon 6, which indicates that the clay layers were not dispersed and distributed. During the preparation of the nanocomposites by the after-mixing method, disordering of the clay layers was observed with increasing clay addition time and was suspected to result from the rapid polymerization of nylon 6 within the clay layers.

• Applied Chemistry for Engineering
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• v.22 no.5
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• pp.490-494
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• 2011

Nanocomposites of blends of polyethyleneterephthalate (PET) and polyamide66 (Nylon66) containing natural and organically modified montmorillonite clays (PM, $Cloisite^{(R)}$ 25A and 15A) were prepared by melt mixing. DSC results showed that the addition of clay changed the crystallization behavior of PET/Nylon66 nanocomposites. Clay C25A was observed to most significantly change the crystallization temperature than other clays in blends of PET and Nylon66, which may be caused by the difference in interaction with matrix polymers. AFM results also showed that the lowest value of surface roughness was observed for nanocomposites containing C25A indicating the smooth and relatively homogenous surface. Mechanical properties measurement showed the similar results. Contact angle was measured to study the difference in hydrophobicity. An increase in contact angle was observed for nanocomposites with C25A or C15A due to the increased hydrophobicity.

• Proceedings of the Korean Fiber Society Conference
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• 2003.10a
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• pp.57-58
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• 2003

Thin coating layer of clay minerals was fabricated on nylon fiber and uv-light resistivity of the clay-coated nylons, schematically shown in Figure 1, were investigated. Clay minerals with higher absorbance protect the nylon fibers more effectively from uv light. The coating process is expected as safe and stable procedure because clay and aqueous dispersion of the clay used for the process is innocuous.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2003.10a
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• pp.16-20
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• 2003

As the preliminary works for the preparation of exfoliated nanocomposites by reactive extrusion (REX) the modified anionic polymerization proceeded in a flask using an $\varepsilon$-caprolactam, catalyst, initiator, and clay. Polymerization methods were classified with a variation of the clay adding time. Intercalations mechanism of clay layers was investigated by measuring the WAXD peaks of clay with polymerization. In the preparation of nanocomposites, the molecular weight of nylon 6 was affected by the clay content. From the mechanical property measurement, improved properties were obtained in comparison to the neat nylon 6, and these properties were also affected by the molecular weight.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.4
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• pp.743-748
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• 2006

We investigated the flame retardancy and the mechanical properties of Nylon6 by using melamine-based halogen-free flame retardants(melamine cyanurate:MC-100 and melamine phosphate:MP-100). We chose the UL-94 method for flame retardancy and measured the tensile strength, flexural strength, flexural modulus by using UTM and impact strength by using Izod impact tester. We also tested the effect of nano-clay on flammability and mechanical properties. We obtained the V0 grade when the concentration of flame retardant was over 5 wt%. The tensile strength and flexural strength decreased and flexural modulus increased with the concentration of both flame retardant systems. The results showed that MC-100 system was better than MPP-100 system. Because of poor dispersion, we did not obtain the synergistic effect of nano-clay.

• Magazine of the Korean Society of Agricultural Engineers
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• v.12 no.2
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• pp.1965-1970
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• 1970

The experiment was carried out in order to improve the leakage stopping work in the irrigation canal founding on the porous soil. But the experiment had many problems to be studied more owing to the insufficient time and facilities. The results obtained are summarized as follows; 1. Polyethylene film is estimated not to make strength decrease owing to buring in the subsoil, but to make owing to the sunlight. 2. Coated nylon shows the tendency to deteriorate strength when it is buried in the earth or exposed to the sun for long time, but leakage is all but impermeability generally. 3. Leakage loss rates for one hour show some differences in the canal to be full with water in accordance with operating methods, that is, the clay lining section is 12.6%, the coated nylon lining section is 1.7%, the polyethylene film lining section is 1.3%, respectively. 4. Leakage quantities per wetted perimeter unit area show $3.556cc/cm^2/hr$. in the clay lining section, $1.574cc/cm^2/hr$. in the coated nylon section, $0.695cc/cm^2/hr$. in the polyethylene film lining section, respectively. 5. When the construction fund make the clay lining section as a standard, the polyethylene film section is 92.1%, the coated nylon section is 174.2%, respectively. But, the unit cost of execution may be low when the polyethylene film and the coated nylon will enable to mass-produce for the purpose of execution.

• Applied Chemistry for Engineering
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• v.16 no.4
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• pp.502-506
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• 2005

In the presence of various clays, nylon/clay nanocomposites were synthesized by anionic polymerization of ${\varepsilon}$-caprolactam (CL) via monomer casting method. The effect of each clay on polymerization reaction was investigated and the change in gallery structure of clays during polymerization was analyzed by X-ray diffraction. When the three kinds of organo-clays were used in the amount of 2 wt% of CL, polymerizations were not successful due to an increase in viscosity during polymerization. Significant changes were not observed in the mechanical and thermal properties of the composites containing organo-clays with 1 wt%. On the other hand, composites containing natural clay up to 5 wt% were successfully prepared, and the composite with 5 wt% showed a decrease in tensile strength and elongation, and remarkable improvement in thermal properties.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.352-353
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• 2003

Clay 분산 유/무기 나노복합재 제조기술은 실리케이트 층상구조의 점토광물을 나노 스케일의 시트상의 기본 단위로 박리(exfoliation)하여 고분자수지에 분산시킴으로써 범용 고분자의 낮은 기계적 물성의 한계를 엔지니어링 플라스틱 수준으로까지 올리고자 하는 것으로서, 기존의 무기 충진재 및 강화재의 입자크기(〉1 $\mu\textrm{m}$)를 나노 스케일까지 분산시켜 기존 무기물 충진 복합재의 단점을 한층 보완하는 것을 목표로 하고 있어 성능 및 원가 면에서 매우 유리한 방법으로 21세기의 복합재료 생산시장의 판도에 상당한 변화를 가져오게 할 수 있는 핵심기술이라 할 수 있다. (중략)

• Proceedings of the Korean Fiber Society Conference
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• 1996.04a
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• pp.1-4
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• 1996