• 폴리머
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• 제24권3호
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• pp.358-365
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• 2000

Miscibility itnd thermal behavior of blends of synthetic biodegradable aliphatic polyester (Bionolle) with poly(epichlorohydrin) (PECH) were investigated by a differential scanning calorimetry (DSC), a dynamic mechanical thermal analyzer (DMTA) and a rotational rheometer. Observed both single glass transition temperatures from the DSC in agreement with the Fox equation and single T$_{g}$ changes as a function of composition from the DMTA indicate that these blend mixtures are miscible. In addition, the miscibility of this blend system was also observed from the single curve of the Cole-Cole Plot of log G′($\omega$) vs. log C"($\omega$) from the dynamic test using a rotational rheometer. This was further verified from the cryogenically fractured surface of BDP/PECH blends by scanning electron microscopy.

• 공업화학
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• 제3권3호
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• pp.377-385
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• 1992

• 청정기술
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• 제8권4호
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• pp.223-228
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• 2002

다양한 화학구조를 포함하는 폴리에스테르를 분해성 수지인 셀룰로오스와 비분해성 수지인 PVC 및 PE를 기준물질로 한 controlled compost test와 soil burial test를 적용하여 생분해 거동을 살펴보았다. 이들 고분자의 화학구조가 유연한 지방족 사슬과 에스테르기를 가지고 있는 지방족 폴리에스테르는 가수분해 효소에 의해 분해되고, 방향족 고리를 포함하는 공중합 형태의 폴리에스테르는 상대적으로 낮은 생분해도를 보여주었다. 조절된 퇴비화 조건에서 셀룰로오스가 45일에 70.6%의 분해도를 보일 때, 합성된 poly(butylene adipate-co-succinate), poly(butylene succinate), poly(butylene adipate-co-succinate-co-terephthalate)는 각각 44.0%, 32.0%, 23.4%,의 생분해도를 보여주어 이들 고분자의 화학적 구조에 따라 생분해거동이 많은 영향을 받음을 확인하였다.

• 한국고분자학회지:고분자과학과기술
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• 제5권1호
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• pp.13-18
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• 1994

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2001년도 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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• pp.27-29
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• 2001

• KSBB Journal
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• 제27권1호
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• pp.51-56
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• 2012

This research was to investigate the polyester preparation using waste ethylene glycol (EG) generated from the wastepaper pretreatment process. Waste EG was obtained from using EG five times repeatedly in the pretreatment of wastepaper. The hydroxyl value of the waste EG was 441 mg KOH/g and its composition was 0.68% cellulose, 6.5% hemicellulose, 6.1% lignin, and 86.7% EG. Maleic acid was used as carboxylic acid. The effect of reaction temperature and time except carboxyl group/hydroxyl group ratio on the crosslinkage of the prepared polyester was marginal. Citric acid, lithium hydroxide and dicumyl peroxide were used as additive or catalyst to enhance the crosslinkage of polyester. Among them, 10% of citric acid was found to be most effective. The crosslinkage was 86% when the polyester was prepared at an optimum condition such as $130^{\circ}C$ and 15 minutes, 1.5 of C/H ratio, and 10% of citric acid, and its insoluble percentage in boiling water for 6 hours was 47%. The weight loss of the prepared polyester was approximately 40% when it was buried in damp soil for 5 months, indicating that it is readily biodegradable. This results can provide some information for future development of wastepaper pretreatment by organic solvent.

• 한국식품과학회지
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• 제47권2호
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• pp.224-232
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• 2015

CP 처리의 CBPE 필름의 물리화학적 특성 및 생분해 특성에 대한 영향을 연구하였다. CP 처리는 CBPE 필름의 인장 강도, 신장률, 그리고 광투과도와 같은 물리적 특성에는 영향을 주지 않았으나, air-CP 처리는 CBPE 필름의 유연성, 수분 방벽 특성, 그리고 인쇄적성을 향상시켰다. Air-CP 처리는 저장 중 CBPE 필름 표면의 조도와 O와 N 원소를 포함한 작용기의 양을 증가시켰고, 인쇄적성, 열분해성, 그리고 미생물 분해성을 향상시켰다. 본 연구에서 CP 처리 후 CBPE 필름 표면에서 보여지는 노화 현상을 XPS 결과를 통해 확인할 수 있었다. 본 연구는 CP 처리가 CBPE 필름을 비롯하여 다른 생분해성 식품 포장재의 물리적 특성과 생분해성을 향상시킬 수 있는 기술로서 적용될 수 있다는 가능성을 보여주었다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1997년도 춘계학술발표회 논문집
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• pp.328-332
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• 1997

Hot stretching focused on the improvement of properties of poly(L-lactic acid) fiber. Some aliphatic polyesters are biodegradable under microbial attack and the new unique applications are expected. Generally, these materials have a somewhat low melting temperature and low mechanical properties compared with the aromatic polyesters. In this study, melt-spinning of poly(L-lactic acid) was conducted. We investigated effects of the stretching and the molecular orientation of aliphatic polyester fibers on the change of fine-structure. Glass transition temperature, molecular orientation and crystallinity increased according to the increase of stretching ratio.

• 한국재난정보학회 논문집
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• 제3권2호
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• pp.23-35
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• 2007

Recently, for places with poor vegetating environment, such as slopes made of weathered soil or rocks, erosion tranquilizers, coverings and composite fertilizers have been mixed with seeds and sprinkled onto soil. Also, these plant revegetations have been mixed with nets and used to strengthen cohesion. However, this technique often obstructed plant growth and caused pollution because of not decomposing nets. This study has tested influence on plant revegetation B for slope of weathered soil and rocks and decomposition of naturally decomposing polyester filament yarn. In result, it was showed that plant revegetation B does not harm environment in case of applying it to soil slope and enhance protection capacity of slopes as time goes by. Also, naturally decomposing polyester filament yam was analyzed its physical properties with the passage of time and was known that naturally decomposing polyester filament yarn transformed into a structure easy to decompose by hardening. Thus it is considered that the revegetation method used this study was very effective method for plant establishment and stability of slope.

• 한국작물학회지
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• 제48권1호
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• pp.1-7
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• 2003

In spite water direct seeding cultivation of rice has advantages in terms of laborsaving and cost-down, it demonstrates uneven seedling establishment and difficult weed management. To select an applicable mat for mulching system of water seeded rice, weed occurrence, growth and yield performances of rice, and soil temperature were evaluated in several kinds of biodegradable mulching material. Field studies were conducted at the experimental farm of National Crop Experiment Station in 1999 and 2000. Among the mats tested in 1999, Safer-mat had the greatest effect on inhibiting weed occurrence and Lawn-mat demonstrated the least efficacy of weed control (EWC) value. In Safer-mat treatment, Ludwigia prostrata was the dominant weed species but Echinochloa crus-galli was not observed. Different kinds of mulching material from the mats studied in 1999 were tested in 2000. Biodegradable polyester (PES) coated on the recycled paper for newspaper press (RP) treatments showed similar or higher EWC values than non-mulched broadcast seed rice with 2 times of herbicide application (BC-herbicide) and Safer-mat that was the most effective mat on preventing weed appearance in 1999. Immediately after mat mulching on the surface of paddy soil, five pregerminated rice seeds were manually sown in each 3cm-hole formerly punctured at 30${\times}$14 cm spacing in 2000. All the 3 kinds of mulching material tested in 2000 had better seedling stand than BC-herbicide treatment. Rice yield in PES coated with 10 thickness on RP (PES10 $\mu\textrm{m}$＋RP) was a little higher than in BC-herbicide treatment but the former produced less panicles in unit land area than the latter. PES10 $\mu\textrm{m}$＋RP demonstrated a great effect on raising soil surface temperature than non-mulching treatment throughout the period of seedling establishment.