• Polymer(Korea)
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• v.25 no.5
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• pp.649-656
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• 2001

Miscibility of poly(4-vinylpyridine) (P4VP) blends with poly(vinyl acetate-co-vinyl alcohol) (VAc-VAL copolymers) was investigated as a function of comonomer composition of VAc-VAL copolymers. Differential scanning calorimetry (DSC) and thermo-optical microscopic (TOM) analysis confirmed that P4VP is miscible with VAc-VAL copolymers containing more than 30 mole% VAL. Fourier transform inflated (FT-IR) spectroscopic analysis revealed that the strong intermolecular hydrongen bonding interaction between the vinylpyridine and VAL hydroxyl group was formed. Theoretical phase diagram was constructed by the calculation using the Association model, a thermodynamic model for hydrogen-bonded polymer blend systems developed by Coleman et al. The calculated theoretical binodal phase diagrams were in good agreement with the experimentally determined cloud point curves.

• Journal of Bio-Environment Control
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• v.6 no.1
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• pp.43-47
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• 1997

This study was conducted to investigate the effects of various types of mulching materials for cutflower cultivation in statice. The results obtained were as follows ; The soil temperature mulched by black polyethylene film or rice straw was lower as 3$^{\circ}C$ than that of soil mulched by transparent polyethylene film or non - mulching in plastic house. The weed yield occurrenced on the soil mulched by black polyethylene film was lower than that mulched by transparent polyethyl one film and rice straw or non-mulching. The growth characteristics, those are plant height, leaf length and leaf width were not different among the mulching materials but in flower quality and yield of first grade, black polyethylene film produced better than others.

• Proceedings of the Korean Fiber Society Conference
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• 1999.04a
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• pp.67-70
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• 1999

• The Science & Technology
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• v.32 no.1 s.356
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• pp.30-31
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• 1999

KIST 무기화학연구팀(책임연구원 손연수박사)은 4년간의 연구끝에 종이와 비닐에 방염재와 방수재를 뿌려 불에 잘 타지않는 비닐벽지와 방염비닐벽지용 사이즈제를 개발하는데 성공했다. 또 이 연구팀은 최첨단 연구분야인 항암제 연구에도 착수하여 세계 최초로 고분자형 제3세대 항암제를 개발했다.

• 수도
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• s.2
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• pp.62-67
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• 1974

PVC 파이프는 상수도용 배수관을 비롯하여 하수도, 공업용 및 농업용수도 등에서의 수요가 급증하고 있는데 일본 "염화비닐과 포리마" 5월호에 게재된 "경질염화비닐관 매설 실험결과"에 의하면 매설관으로서의 안전성, 타공사에 의한 측토압에 대한 내력, 접합부의 강도, 내충격강도 등이 우수한 것으로 판명되고 있어 참고에 공한다.

• Proceedings of the Korean Society of Grassland Science Conference
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• 1999.06a
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• pp.98-98
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• 1999

본 시험은 호밀 라운드베일 사일리지 제조시 수확시 숙기 및 비닐색이 사일리지 품질에 미치는 영향을 비교하기 위하여 수행되었다. 저장 2개월 후의 일반조성분 함량은 수확시 숙기간에는 유의성이 있었으나 비닐 색간에는 유의적인 차이를 보이지 않았다. 백색비닐을 사용한 경우 IVDMD가 흑색이나 녹색을 사용한 경우보다 높았지만 통계적 유의성은 없었다. pH는 백색이 유의적으로 낮게 나타났으며 흑색과 녹색 비닐간에는 차이가 없었다.(중략)

• Korean Journal of Plant Resources
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• v.16 no.2
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• pp.118-122
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• 2003

These studies were carried out to clarify the effects of black P.E. mulching and planting density on the growth and rhizome yield of Jihwang #1, a new high yielding Rehmannia glutinosa variety. Emergence ratio was higher 3.1％ in mulching than in non-mulching, but was not affected by planting density. Plant height and fresh leaf weight per plant were increased by mulching and at lower planting density. However, the fresh leaf weight per unit area was increased at higher planting density. Dry rhizome weight was increased 28% in mulching than that of non-mulching. Dry rhizome weight per plant was increased, but that of per unit area was decreased at lower planting density.

• Journal of The Korean Society of Grassland and Forage Science
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• v.19 no.4
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• pp.355-362
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• 1999

This experiment was conducted to evaluated the effect of maturity at harvest and wrap colors on the quality of round baled rye(Secal cereale L.) silage at the forage experimental field, Grassland and Forage Crops Division, National Livestock Research Institute, Suwon in 1998. The experiment was consist of split-plot design with three repications. The main plots were three different harvesting stages : boot, heading, and flowering stages, the subplots were wrap colors : white, black, and light green color. Acid detergent fiber(ADF) and neutral detergent fiber(NDF) of rye silage were increased with delayed harvesting date, but there were no significant differdence among wrap colors. However, average in vitro dry matter digestibility (IVDMD) of rye silage with white color wrap tended to have higher than those of other colors. The silage pH of heading stage was highest (5.12), and that of flowering stage was lowest (4.57) in different harvest stages. Among tested wrap colors, white color wrap resulted on lowest pH than others (p<0.05), but there were no significant difference between black and light green color. Dry matter (DM) content of rye silage were increased as harvest stage progressed (p<0.05). However, DM content of white color was highest among warp colors, but there was signifiant difference (p<0.05). Ammonia-N content of silage harvested at boot stage was the highest in harvest stage, but there was no difference between heading and flowering stages. Among wrap colors tested, ammonia-N content of black color was highest, but there was no significant difference. The number of lactic acid bacteria of white colors was highest in different colors, and that of flowering stage was highest among harvest stage. Acetic and butyric acid contents were decreased as harvest stage progressed, and lactic acid was increased from 6.33 to 7.98%. However, wrap colors did not influence lactic acid concentration. Among different wrap colors, outside temperature of rye silage was affected by air temperature, but effect of inside temperature was minimal. Black color wrap increased inside temperature by $3{\sim}5^{\circ}C$. The results of this study indicate that rye should be harvested for round bale silage after heading stage. The quality of rye silage wrapped white and light green color will increase slightly.

• Korean Journal of Medicinal Crop Science
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• v.9 no.4
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• pp.284-289
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• 2001

This study was carried out to know the effect of mulching on growth and yield of Peucedanum japonicum. Time from sowing to germination was 8day at raising seedling(RS) and 40day at direct sowing(DS). The order of goodness in top part growth as follows : RS+white vinyl mulching (WVM), RS+black vinyl mulching (BVM), RS+no mulching(NM) and DS+NM. Tap root length at RS + NM was significantly shorter than those at the others. Tap root at the others was about same length. Tap root diameter was significantly larger at vinyl mulching than at no mulching and the thinnest at DS+NM. The number of supporting root at RS was more than DS as much as $4.7{\sim}7.1$. Rate of dried root weight to fresh weight was highest(30.5%) at DS+ NM and low at vinyl mulching. Dried root yield per 10a was 542kg at RS+WVM, 506kg at RS+BVM, 419kg at RS+NM and 357kg at DS. These results suggested that raising seedling and white vinyl mulching was good for culture of Peucedanum japonicum.

• 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.