• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.