• Title, Summary, Keyword: methyl cellulose (MC)

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Physical Properties of Methyl Cellulose and Hydroxypropylated Methyl Cellulose Films (Methyl cellulose와 hydroxypropylated methyl cellulose 필름의 물성)

  • Han, Youn-Jeong;Kim, Suk-Shin
    • Korean Journal of Food Science and Technology
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    • v.39 no.5
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    • pp.521-526
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    • 2007
  • In this study, we prepared methyl cellulose (MC) and hydroxypropylated methyl cellulose (HPMC) films with polyethylene glycol (PEG) or polyphosphates as elongation enhancing materials, and with lipid layers as moisture barrier materials. We then determined their physical properties and compared the data with target physical properties such as a tensile property of 13.0 MPa, elongation of 130%, and water vapor permeability of $3.47{\times}10^{-2}ng{\cdot}m/m^2{\cdot}s{\cdot}Pa$. The PEG and polyphosphates were required for enhancing elongation, while the coating method seemed better than the emulsion method when applying the lipid layers. With respect to elongation, the MC films were better than the HPMC films.

Effect of Carboxy Methyl Cellulose and Methyl Cellulose on the Functional Properties of Pork Heart Alginate/Calcium Carbonate(AC) Surimi (돼지 심장근 Surimi 의 기능성에 미치는 Carboxy Methyl Cellulose 및 Methyl Cellulose의 영향)

  • 하정욱;우동균;황영만
    • Food Science of Animal Resources
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    • v.20 no.3
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    • pp.199-206
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    • 2000
  • 축육 생산시 주요 부산물인 돼지 심장근으로부터 항산화제(0.02% propyl gallate, 0.2% asxorbic acid, 0.2% sodium tripolyphosphate) 첨가 세척액(25 mM phosphate buffer, pH 6.0)에 의해 제조된 surimi(5% protein 0.6 M NaCl, 25 mM phosphate buffer, pH 6.0)를 alginate(0.4%), calcium carbonate(0.075%) 및 lactate(0.6%) 등의 첨가에 의해 AC surimi 로 조제한 다음, CMC 또는 MC를 일정수준 (0.5%, 1.0%) 첨가하여 surimi 의 pH, 겔의 보수력과 조리 손실을 비롯하여 겔읨 루성을 비교 검톻였다. CMC 첨가시 pH는 0.2 단위씩 감소하는 경향을 보인데 비해 MC 첨가시에는 뚜렷한 변화를 보이지는 않았다. 조리 손실에 대한 영향을 살펴 본 결과 CMC와 MC 첨가구에서 0.5% CMC 첨가구를 제외하고서는 나머지 세 처리구에서 감소하는 경향이었고, 특히 MC 첨가시에는 대조구에 비해 뚜렷한 감소 경향을 나타내었으나(p<0.05) 첨가수준에 따른 차이는 나타나지 않았다 CMC나 MC의 첨가는 보수력에 대해서는 거의 영향을 미치지 않은 것으로 나타났고, 물성에 대한 측정 결과에서 CMC 첨가시에는 겔의 강도. 경도 및 탄성등은 약간 증가하였으나 유의적인 차이를 나타내지는 않았고 (P<0.05), MC 첨가시에는 뚜렷한 차이를 나타내지 않았으며, 겔 응집성에 대해서는 CMC와 MC 첨가에 의해 서로 다른 경향을 나타내었다.

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Strengthening of De-waxed Paper by Methyl Cellulose (MC) and Its Preservability - Effect of Viscosity and Coating Ratio of MC - (메틸셀룰로오스에 의한 탈랍지의 강도보강처리 - 메틸셀룰오스 점도 및 도포율의 영향 -)

  • Choi, Kyoung-Hwa;Jeong, Hye Young;Cho, Byoung-Uk
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.47 no.6
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    • pp.130-138
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    • 2015
  • This study was conducted to investigate the effect of the strengthening treatment of methyl cellulose (MC) on properties and aging characteristics of the dewaxed papers during humid heating aging. Beeswax-treated Hanji was dewaxed by the supercritical fluid extraction method, and subsequently the strengthening treatment was performed with MCs having three different viscosities. MC was first applied by dipping a dewaxed paper into a MC solution whose concentration was controlled from 0.5% to 1.5%. After the strengthened papers were artificially aged at $80^{\circ}C$ and 65% RH, the changes in optical and mechanical properties of the samples were evaluated. The results show that viscosity and especially pick-up of MC influenced the strengthening efficiency and aging characteristics of dewaxed paper. Strength was increased with the MC coating weight; in addition, strengthening with MC improved preservability of the dewaxed paper. The optimum conditions for the strengthening with MC was found to be the coating ratio of 4% with 1500 cP MC.

Studies on the Compatability of the blend of PVA and Methyl cellulose (PVA/메틸셀루로스 블랜드의 상용성에 관한 연구)

  • Park, Jun-Seo;Park, Jang-Woo
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.5 no.2
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    • pp.1-8
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    • 1999
  • The state of compatability of poly(vinyl alcohol)(PVA) and methyl cellulose(MC), prepared by an aqueous solution casting, were investigated over the entire compositions by dynamical mechanical analyzer(DMA) and differential scanning calorimetry(DSC). The glass transition temperatures of the blends, estimated by DMA, indicate that the blends of PVA and MC showed a definite degree of partial miscibility by showing two glass transition temperatures below 80 wt % MC contents in the blends and one glass transition temperature above 80 wt % of MC contents. The DSC results show a depression of melting point and crystallization temperature of PVA in the blends containing more than 80 wt % MC. This indicates that a considerable compatibility in the blend above 80 wt % MC contents may be attribute to the presence of interaction of hydroxyl groups of component polymers through hydrogen bonding. The DMA study of the effect of plasticizer on the polymers showed that water was a good plasticizer for PVA and PEG400 for MC. The addition of water and PEG400 in the blends showed a synergic plasticizing effect on these blends, which resulted in the large extent of the improvement of the compatibility. The elongation of PVA, MC and blonds was found to increase with addition of PEG400 in the blends, but the tensile strength to decrease with addition of plasticizer.

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Durability Estimation for ER Fluids of Methyl Cellulose Component in Smart Hydraulic Systems (지능형 유압시스템을 위한 메틸 셀루로이즈 성분 ER 유체의 내구성 평가)

  • 김옥삼;박우철
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.6
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    • pp.1211-1219
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    • 2001
  • The electro-rheological(ER) fluids for smart hydraulic system are a class of colloidal dispersion which exhibit large reversible Changes in their rheological behavior when they are subjected to external electrical fields. This paper presents experimental results on material properties of an ER fluids subjected to electrical fatigues. As a first step, ER fluid is made of methyl cellulose(MC) choosing 25% of particle weight-concentration. Following the construction of test mechanism for durability estimation, the dynamic yield shear stress and the current density for the ER fluids of MC component are experimentally distilled as a function of electric field. In addition, the surface roughness of the employed electrode are evaluated as a function of the number of the electric-field cycles.

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Study on the Extending Storage Life of Grape by Applying Edible Coating Materials (가식성 코팅물질을 이용한 포도의 저장성 연장 연구)

  • Kim, Joon-Yeol;Han, Myung-Ryun;Chang, Moon-Jeong;Kim, Byung-Yong;Kim, Myung-Hwan
    • Applied Biological Chemistry
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    • v.45 no.4
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    • pp.207-211
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    • 2002
  • This study was conducted to increase the shelf life of grape by edible coating material such as methyl cellulose (MC) with antimicrobial substances, n-capric acid isopropyl ester (ci) and sodium nitrate (sn), added by spraying method. The quality changes of packaged grapes with wrapping PE film on EPS tray were investigated for 16 days at $30{\circ}C$. The shelf-lives of C and MCci based on the weight reduction ratio of 7% were 6 days and 9 days, respectively. The reduction rate of acidity of C was higher value than those of treatments during 18 days of storage at $30{\circ}C$. The vitamin C reduction ratios of C, MCsn and MCci were 64.8, 51.5 and 49.8%, respectively, after 16 days at $30{\circ}C$. The reduction rates of firmness of C, MCsn and MCci after 16 days at $30{\circ}C$ were 44.2, 26.5, and 23,2%, respectively compared to that of initial storage grapes. The additions of ci and sn had much affected the reductions of bacteria and yeast counts especially early stage of storage. The hedonic sensory evaluation scores of MCci and MCsn had higher values than those of MC.

Surface Properties and Blood Compatibility of Modified Cellulose Membrane (변성 셀룰로오즈막의 표면물성과 혈액 적합성)

  • Lee, Soon Hong;Huh, Hoon;Lee, Young Moo;Kim, Jin Il;Park, Young Hoon
    • Applied Chemistry for Engineering
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    • v.4 no.1
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    • pp.188-195
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    • 1993
  • Polyelectrolyte complexes and graft copolymers as biomaterials were synthesized from the water soluble cellulose derivatives. Polyelectrolyte complexes have been prepared from carboxymethyl cellulose (CMC) and gelatin. Graft copolymers(Mc-g-AA) were synthesized by grafting acrylic acid (AA) onto methyl cellulose(MC). (Mc-g-AA) and gelatin polyelectrolyte complexes were also prepared. The optimum conditions of each sample were investigated after chemical crosslinking or heat treatment. The preliminary results show that these materials might be interesting for biomedical applications.

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Strengthening Treatment of Aged Hanji with Water Soluble Polymers (수용성 고분자를 이용한 열화한지의 보강처리)

  • Kim, Kang-Jae;Lee, Min-Hyung;Eom, Tae-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.43 no.5
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    • pp.1-10
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    • 2011
  • In this study, 13 water soluble polymers(6 natural polymer, 7 synthetic polymer) were treated on Hanji. Mechanical properties, morphology and oxidation index with thermal aging were measured on the aged Hanji, dewaxed Hanji and polymer treated Hanji. 3 natural polymer(such as CMC, EC, MC) and 3 synthetic polymers(such as PVA 1500, 2000, PEG 1500) treated Hanji had higher strength than other polymer treated Hanji. The oxidation index of 3% methyl cellulose solution treated Hanji did a little increase with thermal aging. Finally, methyl cellulose was found to be the most efficient method for strengthening the dewaxed Hanji. The best aging safety and thermal stability were obtained at the methyl cellulose 3% water solution.

Effect of Edible Coatings on Softening of the Stored Immature Plums (식용코팅이 미숙 자두의 연화에 미치는 효과)

  • Song, Tae-Hee;Kim, Chul-Jai
    • Applied Biological Chemistry
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    • v.42 no.4
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    • pp.317-323
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    • 1999
  • Immature plums(Prunus salicina L.) were coated with edible coatings, calcium-added methyl cellulose(CaMC) and hydroxy propyl methyl cellulose-15(CaHPMC-15). Weight loss and respiration rate of immature plums coated with CaMC and CaHPMC-15 were lower only at the earlier storage period. The titratable acidity of plums was decreased and pH was increased during storage, Soluble pectin, pectinesterase, and polygalacturonase activity as the marker of softening were commonly increased with storage time, but those increases were lower in CaMC and CaHPMC-15-coated plums. Mechanical firmness became significantly soft during storage, while the coated plums were remained harder. As a result of sensory evaluation, softening of plum tissue was found during storage, but the coated plums had the harder texture. These data suggest that the application of CaMC or CaHPMC-15 coatings into immature plums can reduce the postharvest softening during storage.

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Mechanical Properties for Methyl Cellulose(MC) Ingredient ER Fluids According to the Numbers of the Electrical Field Cycles (전기장 싸이클 수에 따른 MC성분 ER유체의 기계적성질)

  • 김옥삼;박우철
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.37 no.4
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    • pp.296-301
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    • 2001
  • Electro-Rheological (ER) fluids belong to a class of colloidal suspensions whose global characteristics can be controlled by the imposition of an appropriate external electrical field upon the fluid domain. The ER fluids for smart hydraulic system are a class of colloidal dispersion which exhibit large reversible changes in their rheological behavior when subjected to external electrical fields. This paper presents experimental results on mechanical properties of an ER fluids subjected to electrical fatigues. As a first step, ER fluid is made of methyl cellulose(MC) ingredient choosing 25% of particle weight-concentration. Following the construction of test for mechanical properties of ER fluid, the shear stress, dynamic yield stress and current density of the ER fluids are experimentally distilled as a function of electric field cycles. The mechanical properties test of operated ER fluids are distilled and compared with those of unused ER fluids.

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