• 한국포장학회지
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• 제4권1호
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• pp.33-40
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• 1997

The microbial growth of fresh, vacuum packaged, cook-in-bag uncured beef patties was determined in two film structures, a commercial (PE/EVOH), and super barrier ($SiO_2$ coated polyester) material. Packaged samples were cooked to internal temperature of 71 and $82^{\circ}C$ for 30 minutes, and stored in temperature abused ($23{\pm}2^{\circ}C$) and refrigerated storage ($4-6^{\circ}C$). Barrier properties had a significant effect (p<0.001) on aerobic and mesophilic growth in the abused condition. Cooking temperatures had a statistically significant effect (p<0.05) on aerobic growth in the refrigerated condition. The growth of anaerobes and psychrophiles were not significantly effected by either variables. Storage times had the most significant effect (p<0.001) for all groups of microorganisms. The physical properties of the commercial film (strength, thickness, and shrinkage) were changed after exposure to thermal treatment, while the super barrier package had actually no change.

• 폴리머
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• 제25권2호
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• pp.302-310
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• 2001

무전해도금법을 이용하여 구리/PET 필름 복합재료를 제조하였으며 에칭방법과 촉매액의 조성 및 acceleration 방법을 달리하여 PET 필름과 무전해도금된 구리 피막간의 접착력을 향상시키고자 하였다. HCl 용액으로 에칭된 PET 필름은 NaOH에 의한 것보다 더욱 세밀하게 에칭되어져 구리와 PET 필름간의 접착력은 향상되었으나 전자파 차폐효과는 유사한 경향을 보였다. 촉매액의 조성변화에 따른 영향을 살펴본 결과 PdCl$_2$:SnCl$_2$의 몰비가 1:4에서 1:16으로 증가할수록 PET 필름 위에 적층된 Pd/Sn 콜로이드 입자들의 크기가 감소하며 고르게 분포되는 경향을 보였다. 따라서 이들의 몰비가 증가할수록 구리도금이 균일하고 조밀하게 이루어져 접착력 및 차폐효과가 증가하였다. 또한 NaOH보다 HCl로 acceleration한 경우 촉매 입자의 크기가 작고 더 균일하게 분포되어 우수한 접착력과 도금물성을 나타내었다.

• 한국염색가공학회지
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• 제32권3호
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• pp.176-183
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• 2020

In order to study wearable air cushion materials capable of responding to massive impact in high-altitude fall situation, high tenacity woven fabrics were bonded by heat only depending on various type of thermoplastic films and then mechanical properties were measured. Tensile strength, elongation, and 100% modulus measurement results for 4 types of films show that TPU-2 has higher impact resistance and easier expansion than PET-1. After thermal bonding, the combination with the highest tensile strength was a material with a TPU-2 film for nylon and a PET-2 film for PET, so there was a difference by type of fabric. The tear strength of the bonded materials were increased compared to the fabric alone, which shows that durability against damage such as tearing can be obtained through film adhesion. All of the peel strengths exceeded the values required by automobile airbags by about 5 times, and the TPU-2 bonded fabric showed the highest value. The air permeability was 0 L/dm2 /min. For both the film and the bonded material, which means tightness between the fabric and the film through thermal bonding. It is expected to be applied as a wearable air cushion material by achieving a level of mechanical properties similar to or superior to that of automobile airbags through the method of bonding film and fabric by thermal bonding.

• 한국응용과학기술학회지
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• 제22권2호
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• pp.123-135
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• 2005

Reaction intermediates PCP/BZA (PBI) and tetramethylene bis(orthophosphate)(TBOP) were synthesized from polycaprolactone (PCP) and benzoic acid (BZA) and from pyrophosphoric acid and 1,4-butanediol, respectively. Benzoic acid modified polyesters containing phosphorus (APTB-S, -10, -15) were synthesized by polycondensation of the prepared PBI (containing 5, 10, 15wt% of benzoic acid), TBOP, adipic acid, and 1,4-butanediol. Network structured PU flame-retardant coatings (APHD) were prepared by curing the synthesized benzoic acid modified polyesters containing phosphorus (APT B - 5 , -10, -15) with hexamethylene diisocyanate (HDI)-timer. From the TGA analysis of APTBs, it was found that the afterglow decreased with the amount of BZA content at the high temperatures. With the introduction of BZA, the film viscosity and film hardness of APHD decreased. With the introduction of caprolactone group, the flexibility, impact resistance, accelerated weathering resistance of APTBs increased. Flame retardancy of the coatings was tested. In a vertical burning method, APHD shows 210$^{\sim}$313 seconds, which indicates that the coatings are good flame-retardant coatings. Moreover, the amount of afterglow and flame retardancy of the coatings are decreased with increasing BZA content.

• 한국의류학회지
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• 제32권11호
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• pp.1792-1801
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• 2008

This study was to develope the pesticide-proof clothes(PPC) for fruit-grower which has been well known over applied agricultural chemicals. The ergonomic evaluation of PPC were tested in two ways. Male adults volunteered the tests to evaluate the safety to pesticide in the field and the thermal comforts in the climate-chamber($30^{\circ}C$, 60%R.H.). PPC were made of 4 different fabrics. Two of them were on the market(coated non-woven and coated nylon). Others were water-repellent treatment and coated waterproof film by developed polyester. The field study was conducted for farmers growing apples to evaluate pesticide exposure. In this experiment, we collected data with patch test on the head, chest, back, right upperarm, right forearm, left thigh and left calf. From the results, the developed PPC showed the more excellent comfort than an existing PPC with nylon coated polyurethane. But the developed PPC of water-repellent fabric was penetrated into the PPC. Therefore, we designed the functional pesticide-proof clothes of 2 different developed polyester fabrics(water-repellent treatment in chest, abdomen, the lower of back, waist, and calf; coated waterproof film in head, shoulder, the upper of back, the crotch, hip, upper arm and thigh).

• 폴리머
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• 제24권1호
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• pp.72-81
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• 2000

벤조산 폴리에스테르/락톤 폴리올의 합성은 디올로서 폴리카프로락톤 0201, 트리올로서 트리메틸올프로판, 2염기산으로서 아디프산 및 1염기산으로 벤조산을 사용하였다. 폴리이소시아네이트 프리폴리머는 HDI-biuret형인 Desmodur N-100을 사용하였다. 벤조산 폴리에스테르/락톤 폴리올, 폴리이소시아네이트, 안료, 습윤분산제 및 플로우개량제 등을 블렌드하여 2성분계 폴리우레탄 도료를 제조하였다. 제조된 폴리우레탄 도료로서 도막시편을 제작하여 각종 도막 물성시험을 행한 결과 KS 규격에서 제시한 기준치와 비교하여 내마모성, 촉진내후성, 황변도는 우수하게, 굴곡성, 내충격성, 60$^{\circ}$ 경민광택도, 접착력, 내유성, 명도지수차는 양호하게, 경도는 다소 나쁘게 나타났다. 따라서 디올로서 폴리카프로락톤 0201을 도입한 후 내유성, 굴곡성, 내충격성의 장점이 나타남을 확인하였다. 또한 벤조산 함량변화에 따른 고화 및 경화거동을 살펴 본 결과, 고화에 따른 건조시간은 2~4시간으로, 경화에 따른 가사시간은 20~37시간으로 각각 나타나, 도막표면의 고화 및 경화상태가 양호함을 보여주었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.1067-1070
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• 2008

DuPont Teijin FilmsTM have developed engineered substrates for flexible electronics. Teonex(R) Q65 and Melinex(R) ST506/5004 are biaxially oriented semi-crystalline polyesters. Smooth planarised Teonex(R) Q65 and Melinex(R) ST506/504 emerge as suitable substrate materials for display backplanes and frontplanes. This contribution discusses the impact of applying a planariser coating to these films. Also, the effect of a more controlled finishing process treatment upon film shrinkage and CLTE is presented.

• 한국의류학회지
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• 제25권1호
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• pp.154-161
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• 2001

We have treated polyester fabric with $CF_4,\;C_2F_6,\;SF_6\;and\;C_3F_6$ glow discharge plasmas to develop functional fabrics which preserve moisture transportation and water proofing nature. Modified properties were evaluated by water vapor permeation rate and breakthrough water pressure. The change of surface morphology was observed by SEM. Fiber interstice of the plasma treated fabric was calculated as $0.32{\mu}{\textrm}{m}$, and this value was sufficiently ideal as water repellent material. The moisture transportation of ${CF_4}-treated$ fabric was good as much as untreated fabric, and those of $C_2$F(sub)6-treated, SF(sub)6-treated fabrics were reduced by 1~3%, and that of ${C_3F_6}-treated$ fabric was reduced by 15%. The best treatment condition were 0.06 torr 120 seconds in $CF_4$, 0.05 torr 30 seconds in $SF_6$, 0.08~0.15 torr 90 seconds in $SF_6$ and 0.1 torr 45 seconds in $C_3F_6$ respectively. The grade of moisture transportation effect was $CF_4>C_2F_6>SF_6>>C_3F_6$, and water proofing effect was $C_2F_6{\approx}CF_4>C_3F_6>SF_6$. It was observed by SEM that the thin film was formed on the surface of the treated substrate by the fluorocarbon plasma treatment.

• 한국응용과학기술학회지
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• 제28권3호
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• pp.351-358
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• 2011

It was researched to be alternative of TGIC type hardener with human hazard element as PT 910 mix powder paint with hardener. Generally PT 910 was compared with TGIC & Epoxy resin of hardener to be used at thermosetting powder paint. We inquired a property of matter for paint through Gel time, glass transition temperature, melting point and a property of matter for film through a property of adhesion, a property of tolerance, softness, gloss, acid-resistant, alkali-resistant, salt water spray-resistant, facilitation climatic. When PT 910 is used of hardener, it was shown the excellent results in gel time, softness, salt water spray-resistant, fracilitation climatic and the similar results in melting point, a property of tolerance, a property of adhesion, gloss, acid-resistant, alkali-resistant, as compared with the powder paint used by TGIC hardener. The glass transition temperature was little low. But there was slightly different results. After the study results, we reached the conclusion that thermosetting powder used by PT 910 is alterative to by TGIC hardener.

• Membrane and Water Treatment
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• 제13권3호
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• pp.139-145
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• 2022

Development in advanced separation processes leads to the significant advancement in polymeric membrane preparation methodology. Therefore, present research investigated the preparation and characterization of cellulose acetate membrane by phase inversion separation method to determine optimized operating parameters. Prepared CA membrane's performance was been analyzed in terms of % rejection and flux. Investigation was conducted to study effect of different parameters such as polymer concentration, evaporation rate, thickness of film, coagulation bath properties, temperature of polymer solution and of the coagulation bath etc. CA membrane was fabricated by taking polymer concentration 10wt% and 11wt% with zero second evaporation time and varying film thickness over non-woven polyester fabric. Effect of coagulation bath temperature (CBT) and casting solution temperature were also been studied. The experimental results from SEM showed that the surface morphology had been changed with polymer r concentration, coagulation bath and casting solution temperature, etc. Lower polymer concentration leads to lower precipitation time giving porous membrane. The prepared membrane was tested for advanced waste water treatment of relevant effluent stream in pilot plant to study flux and rejection behavior of the membrane.