• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.374-375
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• 2006

The purpose of this paper is to investigate the propriety of biodegradable polymer pad in spite of exchanging from existing polyurethane pad used in CMP(Chemical Mechanical Planarization). Poli 400 of G&P Technology for CMP and Ellipsometer of Rudolph AutoEL-III for measurement were used in this experiment. From this experiment, it is proven that the biodegradable polymer pad is sufficiently suitable in CMP process. Therefore, it is expected that, by using the biodegrable pad CMP manufacturing process, and will be decreased. Especially, wafer scratch can be decreased.

• Elastomers and Composites
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• 제34권4호
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• pp.292-298
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• 1999

Lactide oligomer with number averagae molecular weight of 460 was synthesized and reacted with poly(oxyteramethylene)glycol(PTMG, Mn = 650) to obtain oligolactide oligomer-terminated PTMG. Polyurethanes were synthesized from the oligolactide-terminated PTMG, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol. The mechanical and thermal properties of the polyurethanes and PTMG based polyurethane as control were measured by means of DSC and tensile tester. Degradation behavior of these polyurethanes put into a compost was evaluated by variation of mechanical properties, surface state, and weight loss. Modulus and weight significantly decreased with increasing time. The surface of the oligolactide polyurethane put into the compost during 6 weeks had a number of voids. On the other hand, These properties of the PTMG based polyurethane as control did not change. These results suggest that the novel polyurethanes incorporated oligolactide easily degrade under biodegradable condition.

• 한국레이저가공학회지
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• 제17권4호
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• pp.14-19
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• 2014

Laser beam was applied on the boundary of the polyurethane and biodegradable polyacetate polymers. The distributed laser passed through the polyurethane layer and heated the polyacetate layer, then the soften acetate was squeezed thorough the 1mm square slots of polyurethane for the mechanical joining. The surface roughness ranging between $0.28{\mu}m$ and $3.06{\mu}m$ had almost no effect on joining strength, but the optical properties of HD (High Definition) and UHD (Ultra High Definition) mode affected laser beam transmittance. The optimum laser power was found to be between 8watt and 10watt with 500mm/min of scanning speed. The joining boundary was characterized by optical and SEM analysis. Based on the experiment and characterization results, the laser energy was effective for the polymer joining and efficiency of joining.

• 접착 및 계면
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• 제20권4호
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• pp.140-145
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• 2019

환경적 관점에서 고분자필름이나 코팅제 산업계에서 이산화탄소와 휘발성 유기화합물의 저감은 가장 중요한 이슈 중의 하나이다. 광경화 시스템은 용제를 사용치 않아 휘발성 유기화합물의 방출을 최소화 할 수 있고 빠른 경화로 인한 에너지 소모가 적은 잇점이 있다. 또한, 생분해성 고분자는 거대한 폐플라스틱의 발생을 고려하면 환경적으로 경제적으로 많은 관심을 받고 있다. 따라서 본 연구에서는 생분해성 고분자인 폴리락타이드 다이올과 폴리에틸렌 글리콜을 폴리올로하여 광경화형 폴리우레탄 아크릴레이트를 합성하였고 자외선에 의해 말단의 아크릴레이트 그룹의 경화반응을 진행하였다. 경화된 필름의 인장강도, 파단율 및 Tg는 폴리락타이드 다이올의 함량 증가와 더불어 증가하였고 친수특성과 열정안정성은 폴리에틸렌 글리콜 함량과 비례하였다. 따라서 친환경적인 폴리올의 함량 조절로 광경화 폴리우레탄 아크릴레이트의 물성이 조절 가능하였다.

• 접착 및 계면
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• 제17권1호
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• pp.21-28
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• 2016

본 연구에서는 불법 조업 어선 제압 및 장비 불용화를 위한 접착형 퇴치제 개발의 일환으로 발포형 생분해성 폴리우레탄 연구를 수행하였다. 발포형 폴리우레탄 접착제는 폴리에스터계 및 폴리에테르 폴리올을 포함하는 주재와 고분자형의 이소시아네이트로 이루어진 경화제를 혼합하여 반응이 완결되는 2액형으로, 단기간의 생분해성을 위해 주재에 starch와 dextrin 및 amylase 등을 첨가하여 4주간 약 34%의 생분해도를 OECD 301C법에 의해 얻을 수 있었다. 주재와 경화제의 온도에 따른 점도를 $0{\sim}50^{\circ}C$의 온도범위에서 측정하여 혼합 시 참고할 수 있도록 하였으며, 또한 신속한 발포 및 접착성능을 위해서 $0{\sim}50^{\circ}C$의 온도 범위에서 발포형 폴리우레탄 접착제의 반응 완결 속도(rising time)를 조절하여 1 min 내외로 제어하였다. 또한 면 직물에 대한 T-peel 시험을 수행한 결과 최대 20.78 N/cm, 평균 11.95 N/cm의 접착력을 얻을 수 있었다.

• Korean Chemical Engineering Research
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• 제51권3호
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• pp.382-387
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• 2013

압출 컴파운딩 공정 및 케스팅 필름 공정을 이용하여 생분해성 폴리우레탄(PU)/클레이 나노복합 필름을 제조하였다. PU 수지와의 강한 결합 형성을 위해 유기적으로 개질되어 그 표면에 많은 양의 히드록시기를 갖는 MMT 나노클레이(C30B)를 사용하였다. 압출 공정 중 발생된 높은 전단 응력에 의해 발현된 복합체 내 나노판상체의 삽입/박리 구조 및 분산 상태를 XRD 분석 및 TEM 관찰을 통해 확인하였다. 또한 제조된 나노복합체의 유변물성, 인장물성, 투명성, 산소투과도의 변화를 첨가된 나노클레이 함량에 따라 조사하였으며, 이로부터 나노복합체 내 나노판상체의 박리 및 분산 구조와 물성과의 상관 관계를 제시할 수 있었다. 일정수준의 함량으로 첨가된 나노클레이는 복합 필름의 인장 탄성율, 연신율, 투명성, 산소차단성 등의 성능 향상에 뚜렷하게 기여하였으나, 그 이상의 함량으로 첨가되면 불완전한 박리 및 불균질한 분산성으로 인하여 오히려 성능이 감소하거나 또는 그 증가 폭이 매우 작은 것으로 나타났다. PU/clay 나노복합 필름의 생분해성은 퇴비화 실험을 통한 분해시간에 따른 필름의 산소투과도 및 인장물성의 변화를 관찰함으로써 확인하였다.

• Journal of Forest and Environmental Science
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• 제31권4호
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• pp.297-302
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• 2015

With the intention to solve environmental problems caused by synthetic plastics from petroleum resources, biodegradable polyurethane foams and thermosetting moldings were prepared from biomass, such as wood and wheat bran by liquefaction method. Biodegradability of these biomass-based polymeric materials was investigated. In activated sludge, polyurethane foams from liquefied wheat bran and thermosetting molding from phenolated wood were decomposed approximately 14% and 29% for 20 days, respectively. One of the wood fungi, Coriolus versicolor was able to grow without supplemental nutrition, only with distilled water and polyurethane foam as a nutrition source. Risk assessments were also conducted and results showed that estrogenicity, mutagenicity, and carcinogenicity were not observed in the extractives of biomass- based polymeric materials.

• Archives of Plastic Surgery
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• 제42권2호
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• pp.186-193
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• 2015

Background Polyurethane coating of breast implants has been shown to reduce capsular contracture in short-term follow-up studies. This 30-year study is the longest examination of the use of polyurethane-coated implants and their correlation with capsular contracture. Methods This study evaluates the senior surgeon's (F.D.P.) experience with the use of polyurethane-coated implants in aesthetic breast augmentation in 382 patients over 30 years. Follow-up evaluations were conducted for six months after surgery. After the six-month follow-up period, 76 patients returned for reoperation. The gross findings, histology, and associated capsular contracture were noted at the time of explantation. Results No patient during the six-month follow-up period demonstrated capsular contracture. For those who underwent reoperation for capsular contracture, Baker II/III contractures were noted nine to 10 years after surgery and Baker IV contractures were noted 12 to 21 years after surgery. None of the explanted implants had macroscopic evidence of polyurethane, which was only found during the first five years after surgery. The microscopic presence of polyurethane was noted in all capsules up to 30 years after the original operation. Conclusions An inverse correlation was found between the amount of polyurethane coating on the implant and the occurrence of capsular contracture. Increasingly severe capsular contracture was associated with a decreased amount of polyurethane coating on the surface of the implants. No contracture occurred in patients whose implants showed incomplete biodegradation of polyurethane, as indicated by the visible presence of polyurethane coating. We recommend research to find a non-toxic, non-biodegradable synthetic material as an alternative to polyurethane.

• 패션비즈니스
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• 제8권1호
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• pp.141-155
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• 2004

Chitosan, the natural biodegradable polymer derived from chitin by de- acetylation, has been widely applied to the textile finishing processes for excellent anti-microbial characteristic and handle improvement of fabric. The purpose of this study is to investigate the change of handle when cotton fabric is treated with chitosan-polyurethane mixed solution. The viscosity values of chitosan solutions were 8cps and 50cps, and the wet-pick-up% was maintained at 90%. In case of mixing with water soluble polyurethane, the mixture ratio of chitosan and polyurethane was settled on the solid content ratio of 1:0, 1:0.5, 1:1, 1:2. Also the change of physical properties by neutralization in NaOH solution was studied. The results can be summarized up as follows : 1. Extensibility(EM) and tensile energy(WT) of cotton fabric treated with chitosan are decreased, but bending rigidity(B) is remarkably increased. With the addition of polyurethane, the decrease of EM and WT is weakened and the increase of B is weakened. The case of neutralization is similar to the case of polyurethane addition. 2. By treating fabric with chitosan, FUKURAMI(Fullness and softness) is decreased, but KOSHI(Stiffness), SHARI(Crispness), HARI(Anti-drape Stiff ness) are increased. With the addition of polyurethane, the decrease of FUKURAMI is diminished and the increase of KOSHI, SHARI, HARI are diminished. 3. As the viscosity of chitosan solution increased, the air permeability value increased. The addition of polyurethane decreased the air permeability.

• 폴리머
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• 제25권1호
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• pp.41-48
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• 2001

폴리카프로락톤디올(PCD) 및 폴리에틸렌글리콜(PEG), 디이소시아네이트 및 1,2,6-헥산트리올을 용액중합 방법으로 반응시켜 폴리우레탄(PU) 마이크로겔을 합성하였다. PCD/PEG의 몰비가 다른 마이크로겔의 임계 겔화농도의 성질과 생성에 영향을 주는 중요한 인자임을 알았다. 디이소시아네이트, PCD/PEG의 몰비 및 PEG의 분자량을 달리하여 제조한 PU 마이크로겔의 물리적 및 열적 성질을 실험하였다. PU 마이크로겔은 300nm 이하의 다분산성 구형의 작은 입자로 분포되어 있으며, 저점도 특성을 나타내었다.