http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
키토산-카테콜 하이드로겔의 카테콜 함유량에 따른 유변학적 특성 분석
방은지 ( Bang Eun Ji ),고혜민 ( Ko Haye Min ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
In this study, two types of chitosan-catechol polymers (a-CP and b-CP) were synthesized and mixed with polyvinyl alcohol (PVA) and sodium tetraborate decahydrate (Na<sub>2</sub>B4O<sub>7</sub>·10H<sub>2</sub>O) to form hydrogels. The characteristics of these polymers were tuned by varying the pH during their syntheses, and their structures were characterized using nuclear magnetic resonance spectroscopy and ultraviolet-visible spectroscopy. Rheological and self-healing properties of hydrogels were evaluated. As a result, the viscoelastic modulus was improved due to the increased functional group content, and the self-healing property was excellent regardless of the functional group content.
카테콜-키토산 하이드로겔의 대용량 합성과 자가 치유 특성 분석
최회영 ( Choi Hoe Young ),고혜민 ( Ko Haye Min ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
Chemical crosslinking is the most widely used method for hydrogel preparations. We prepared a hydrogel using chitosan catechol/polyvinyl alcohol and sodium tetraborate decahydrate (Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>·10H<sub>2</sub>O). The formation of hydrogels often presents inconsistent results and issues according to the reaction scale. Therefore, we measured and analyzed the self-healing property and viscoelasticity of hydrogels attributed to scale-up synthesis using a rheometer.
혼합슬래그 잔골재 혼입율에 따른 생체모방 폴리머 혼입 모르타르의 유동성 및 공학적특성
배성호 ( Bae Sung-ho ),박사민 ( Park Sa-min ),김대성 ( Kim Dae-sung ),이재인 ( Lee Jae-in ),고혜민 ( Ko Haye-min ),최세진 ( Choi Se-jin ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In this study, as part of a study to solve the problem of aggregate supply and demand, blast furnace slag fine aggregate and ferronickel slag fine aggregate were used as substitutes for natural fine aggregate, and a bioinspired polymer, a catechol-functionalized chitosan, was used instead of the mixing water.
카테콜 작용기를 함유한 키토산 고분자 혼입율에 따른 시멘트 모르타르의 특성 변화
최회영 ( Hoe Young Choi ),최세진 ( Se-jin Choi ),고혜민 ( Haye Min Ko ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
We synthesized catechol-conjugated chitosan (CCC) to study its usefulness as a construction material additive in cement mortar. The degree of catechol conju- gation (DOC<sub>cat</sub>) of the synthesized CCC was determined to be approximately 14% by UV-vis and <sup>1</sup>H NMR spectroscopy. Furthermore, the hydroxyl and amine groups in CCC could play a crucial role in hydrogen bonding, metal coordination, and cross-linking processes via interaction with adducts from cement mortar. In this study, we observed an improvement in the compressive strength and absorption rate, suggesting that CCC is a promising candidate for high-performance cement mortar.
생체모방 폴리머의 구조 분석 및 폴리머 혼입율에 따른 시멘트 모르타르의 특성 변화
방은지 ( Bang Eun Ji ),최세진 ( Choi Se-jin ),고혜민 ( Ko Haye-min ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In this study, catechol-functionalized chitosan (Cat-Chit), a well-known bioinspired polymer that imitates the basic structures and functions of living organisms and biological materials in nature, was synthesized and combined with cement mortar in various proportions. The compressive strength, tensile strength, drying shrinkage, accelerated carbonation depth, and chloride-ion penetrability of these mixes were then evaluated. In the ultravioletvisible spectra, a maximum absorption peak appeared at 280 nm, corresponding to catechol conjugation. The sample containing 7.5% Cat-Chit polymer in water (CPW) exhibited the highest compressive strength, and its 28-day compressive strength was ~20.2% higher than that of a control sample with no added polymer. The tensile strength of the samples containing 5% or more CPW was ~2.311.5% higher than that of the control sample. Additionally, all the Cat-Chit polymer mixtures exhibited lower carbonation depths than compared to the control sample. The total charge passing through the samples decreased as the amount of CPW increased. Thus, incorporating this polymer effectively improved the mechanical properties, carbonation resistance, and chloride-ion penetration resistance of cement mortar.