• Korean Journal of Materials Research
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• v.33 no.8
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• pp.323-329
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• 2023

There are many types of foam molding methods. The most commonly used methods are the pressure foaming method, in which foam resin is mixed with a foaming agent at high temperature and high pressure, and the normal pressure foaming method, which foams at high temperature without pressure. The polymer resins used for foaming have different viscosities. For foaming under normal pressure, they need to be designed and analyzed for optimal foaming conditions, to obtain resins with low melt-viscosity or a narrow optimal viscosity range. This study investigated how changes in viscosity, molding temperature, and cross-link foaming conditions affected the characteristics of the molded foam, prepared by blending rubber polymer with biodegradable resin. The morphologies of cross sections and the cell structures of the normal pressure foam were investigated by SEM analysis. Properties were also studied according to cross-link/foaming conditions and torque. Also, the correlation between foaming characteristics was studied by analyzing tensile strength and elongation, which are mechanical properties of foaming composites.

• Journal of the Korea Fashion and Costume Design Association
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• v.2 no.2
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• pp.137-154
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• 2000

The purpose of this study is to investigate the transition of luster material after the tweentieth century. This study was conducted by means of designer collection, journal of fashion, museum data, fabric exhibition and Internet data. The results of this study were as follows: Before the synthetic fiber period, the luster materials were used satin, chamuse, gauze, damask brocade and velvet, except cashmere, mohair and rayon. They are made from silk by the way of giving difference surface property. But since 1960s, it has used not only synthetic fiber with smooth surface but also vinyl, latex, natural leather, synthetic leather and metal. Luster material recently has a tendency to natural and soft shiny, example silket finish, chintz finish, silico coating finish with paper touch feel and so forth.

• Clean Technology
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• v.18 no.1
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• pp.57-62
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• 2012

Aqueous poly (vinyl alcohol) (PVA) solution was modified by using hydrophobic vinyltriethoxysilane (VTEOS) and then adding different amounts of poly (acrylic acid) (PAA) to the resulting solution. Thermal and mechanical properties, contact angle, water vapor transmission rate (MVTR) and oxygen gas transmission rate ($O_2TR$) of the film samples fabricated by these solutions were investigated. The glass transition temperature (Tg) of the VTEOS-modified films was sightly increased and the value remained unchanged according to the amount of PAA. The tensile strength of the VTEOS-modified films was found to be 9.48~10.72 $kg/mm^2$ which showed no significant difference compared with that of PVA. The film prepared with VTEOS-modified PVA/PAA (= 90/10), of which the swelling and solubility were measured to be 198% and 0%, respectively, showed improved water-resistance. The MVTR and $O_2TR$ for the PET film (thickness 50 ${\mu}m$) coated with VTEOS-modified PVA/PAA (= 90/10) film (thickness 2.5 ${\mu}m$) were measured to be 11.04 $g/m^2/day$ and 3.1 $cc/m^2/day$, respectively.

• Applied Chemistry for Engineering
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• v.23 no.2
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• pp.217-221
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• 2012

Blending films having enhanced water-resistance and barrier properties were prepared using the mixtures of poly(vinyl alcohol) (PVA) aqueous solution and poly(ethylene-co-acrylic acid) (EAA) dispersed in water. Thermal-mechanical properties, contact angles, water-vapor transmission rates (WVTR) and oxygen transmission rates $(O_2TR)$ were measured with the content of EAA of blending films, and their water-resistance was evaluated. The tensile strength of the films was found to be $9.16{\sim}11.75\;kg/mm^2$ which showed no significant difference compared with that of PVA, and the hardness increased with the content of EAA. The glass transition temperature and melting temperature of the blending films were slightly improved. The film prepared with PVA/EAA (= 90/10), of which the swelling and solubility were measured to be 109 and 0%, respectively, showed improved water-resistance. The WVTR and $O_2TR$ for the PET film (thickness $50\;{\mu}m$) coated with PVA/EAA (= 90/10) film (thickness $2.5\;{\mu}m$) were measured to be $9.1\;g/m^2/day$ and $2.0\;cc/m^2/day$, respectively.

• Proceedings of the Korean Fiber Society Conference
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• 2003.10b
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• pp.27-30
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• 2003

Casein, a milk protein is used in food, paper, leather and textile industries. The milk casein fiber was developed 1935 first. The strong point of milk casein fiber, the contraction is fewer the wool when washing and damage of harmful insect is smaller than wool.[1] But proteins are the major category of natural polymers that are difficult to be processed into fibrous forms. This is because of their complex macromolecular and three-dimensional structures as well as strong inter- and / or intra molecular forces.[2] (omitted)

• Elastomers and Composites
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• v.36 no.1
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• pp.14-21
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• 2001

To increase the properties of EVA foam such as tensile strength, rebound resilience, and compression set, ethylene-1-butene copolymer (EtBC) was blended with EVA. After that crosslink characteristics of the blends and cell structures and mechanical properties of the foam were studied. As the amount of EtBC increased in EVA/EtBC blends, torque values of oscillating disc rheometer(ODR) increased and the foaming ratio decreased because the viscosity and crosslink density of EVA/EtBC blends increased. Foaming ratio and cell size of the foam increased by increasing the amount of foaming agent. When compared the mechanical properties of the foam which have same densities, tensile strength, rebound resilience, and compression set properties of the foam were improved by increasing the amount of EtBC in the EVA/EtBC blends.

• Polymer(Korea)
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• v.31 no.3
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• pp.177-183
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• 2007

In this study, nano-sized poly(vinyl acetate) (PVAc) particles containing lavender oil as a core material were prepared by using emulsification-diffusion method. Effects of experimental parameters on the characteristics and the release behavior were examined with a field emission- scanning electron microscope, an electrophoretic light scattering spectrophotometer, a visible spectrophotometer and a high performance liquid chromatography The resulting aromatic particles could be prepared in nano-sized globular shapes with the mean particle size of 224 nm by controlling the experimental conditions. From the evaluation of release properties of aromatic PVAc nanoparticles with or without PVA coating, it was found that the aromatic particles coated with PVA show more sustaining and stable release behaviors. Our research on aromatic PVAc nanoparticles could be applied for durable fragrant finishing for textiles, leather products and so on.

• Journal of the Korea Fashion and Costume Design Association
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• v.2 no.1
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• pp.37-49
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• 2000

Korean sports fashion began after 1990. after 1960, using vinyl, leather, plastic ＆ metal material, Yve st. Laurent, Pierre Cardin, Andre Courrges, they lead sportive look. Head of 20th century, fashion was lead by haute­couture, after 60s. It was changed to pret­a poter. Now it can be called of american casual ＆ sports fashion. This study would be a view of modem fashion trend and process of visualization in the future. I studied in reproduction of view ＆ age of hyper media with visual circumstance ＆ artistic background and mordern fashion trend ＆ sports fashion image in korea. In conclusion, sports fashion image as visualizing aesthetic concept of modern fashion be defined as technology for man, for instance comfort, function, flexibility, simplicity and minimalism. Specically, Sports fashion was began satisfied for function after 90s, we can see variety of easy wear, hip-hop casual, entertainment sports wear, new street sports wear, luxury sports wear.

• The Research Journal of the Costume Culture
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• v.11 no.4
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• pp.578-590
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• 2003

The purpose of this study was to analyze the formative characteristics appeared in modem Kitsch fashion which has been shown through the empirical data photogrphes from the 2000's to 2003 and the formative characteristics of Kitsch were divided into the material, ornament, color, pattern to understand the modem Kitsch fashion. The findings of this study could be summarized as follows: First, the modem Kitsch fashion in the material was used cheap, counterfeit materials like vinyl, artificial leather, immitation fur, beads and non-artistic materials like metal, plastic, paper and voluptuous material like seethrough to express eroticism and superficiality as the characteristic of Kitsch. Second, Kitsch fashion in the ornament was shown over-decoration by using the various accessories like bracelet, metal belt, gloves, etc to express as childish and coarse mixtures as the characteristic of Kitsch. Third, the modem Kitsch fashion was using splendid and bright, primary colors to express the image of complicated accumulation. Fourth, the modern Kitsch fashion mainly in the pattern was using ethnic, folklore and pop art pattern or print used hippies and pop art fashion to express the primitive purity as bounding of civilized society.

• The Research Journal of the Costume Culture
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• v.19 no.3
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• pp.473-487
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• 2011

The purpose of this study is to analyze the body type and fashion of posthuman in SF movies. The method of this study was to analyze documentaries, internet web site, fashion books and so forth. The results were as follows: The body types of posthuman were expressed as mutation type, prosthetic type, clone type by biological hybrid or renovation and digital type by computer simulation. The mutation type was expressed as reinforcement of masculinity or feminity and reinforcement of body functions. The fashion item was expressed as a black tailored suit, leather jacket, cat suit, whip, black sunglass, garter belt, high heel shoes, short pants, black one piece dress and functional body suit. The prosthetic type was expressed as reinforcement of body functions and reinforcement of masculinity or feminity. The fashion item was expressed as a military item, high-tech power suit and ergonomic armor suit. The clone type was expressed as the plural ego with reinforcement of body functions. The fashion item was expressed as a power shoulder jacket, fake fur coat, vinyl, black see-through look and functional suit. The digital type was expressed as reinforcement of masculinity or feminity and the plural ego with reinforcement of body functions. The fashion item was expressed as a data suit, leather jacket, black over coat, boots, black sun glass, ethnic items and military items. The meanings of posthuman fashion in SF movies were impurity of posthuman, display of superhuman's power by sexuality, metaphor of power and fantasy of superhero in opposition futuristic dystopia. As mentioned above, posthuman body type and fashion in SF movies become the conversational topic in the real world. The fact that we think about utopia and identity of posthuman in the future is of great significance.