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논문 기본 정보

자료유형
학술저널
저자정보
Yoo, Young Jin (Department of Bio-fibers and materials Science, Kyungpook National University) Um, In Chul (Department of Bio-fibers and materials Science, Kyungpook National University)
저널정보
한국유변학회 Korea-Australia rheology journal Korea-Australia rheology journal 제25권 제2호
발행연도
2013.1
수록면
67 - 75 (9page)

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초록· 키워드

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In this study, the thermo-gelation behavior of hydroxypropyl methylcellulose (HPMC) and hydroxyethyl methylcellulose (HEMC) were examined by rheology. Temperature sweep shear viscosity measurements revealed a significant decrease in the shear viscosity of HPMC and HEMC at the aggregation temperature ($T_{agr}$), which depended on the substitution type (HPMC or HEMC) and degree of substitution. In the dynamic test, G' decreased slightly at $T_{agr}$ and increased significantly at the gelation temperature ($T_{gel}$). The shear viscosity and shear storage modulus (G') can be utilized complementarily to examine $T_{agr}$ and $T_{gel}$. $T_{agr}$ could be detected clearly by the shear viscosity measurement but could not be observed in the G' measurement. On the other hand, $T_{gel}$ could not be detected in the shear viscosity measurement although it can be clearly recognized in G' measurement. Conclusively, the two rheological measurements could be utilized complementarily in detection of $T_{agr}$ and $T_{gel}$. In the meanwhile, HPMC with more hydrophobic residues (methoxy and hydroxypropyl residues) showed smaller $T_{agr}$ and $T_{gel}$ than HEMC, which has hydroxyethyl and methoxy groups. $T_{agr}$ and $T_{gel}$ decreased with increasing number of hydrophobic groups. Molecular weight almost did not affect $T_{agr}$ and $T_{gel}$ of HPMC solution.

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