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183 results on '"Shin, Hye Sun"'

7. Preparation of Non-Isocyanate Polyurethanes from Mixed Cyclic-Carbonated Compounds: Soybean Oil and CO 2 -Based Poly(ether carbonate).

Author

Lee, Ga Ram, Lee, Eun Jong, Shin, Hye Sun, Kim, Joonwoo, Kim, Il, and Hong, Sung Chul

Subjects
SOY oil, ISOCYANATES, CARBON dioxide, POLYURETHANES, OXALYL chloride, PROPYLENE oxide
Abstract

This study presents the synthesis and characterization of non-isocyanate polyurethanes (NIPU) derived from the copolymerization of cyclic-carbonated soybean oil (CSBO) and cyclic carbonate (CC)-terminated poly(ether carbonate) (RCC). Using a double-metal cyanide catalyst, poly(ether carbonate) polyol was first synthesized through the copolymerization of carbon dioxide and propylene oxide. The terminal hydroxyl group was then subjected to a substitution reaction with a five-membered CC group using glycerol-1,2-carbonate and oxalyl chloride, yielding RCC. Attempts to prepare NIPU solely using RCC and diamine were unsuccessful, possibly due to the low CC functionality and the aminolysis of RCC's linear carbonate repeating units. However, when combined with CSBO, solid NIPUs were successfully obtained, exhibiting good thermal stability along with enhanced mechanical properties compared to conventional CSBO-based NIPU formulations. Overall, this study underscores the potential of leveraging renewable resources and carbon capture technologies to develop sustainable NIPUs with tailored properties, thereby expanding their range of applications. [ABSTRACT FROM AUTHOR]

Published
2024
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38. Nine years experiences of solid organ xenotransplantation

Author

Shin, Hye Sun, primary, Yun, Ik Jin, additional, Chee, Hyun Keun, additional, Kim, Jun Seok, additional, Park, Jung Hwan, additional, Yang, Hyun Suk, additional, Kim, Wan Seop, additional, Shin, Ki Cheul, additional, Park, Kyoung Sik, additional, and Oh, Keon Bong, additional

Published
2020
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46. Association between periodontal status and non-alcoholic fatty liver disease in a Korean adult population: A nationwide cross-sectional study.

Author

Shin, Hye‐Sun and Shin, Hye-Sun

Abstract

Background: The objective of this study was to investigate the association between periodontal status and non-alcoholic fatty liver disease (NAFLD) indicators in a representative Korean population.Methods: A cross-sectional study was conducted on 4061 participants >19 years of age using the 2010 Korea National Health and Nutrition Examination Survey data. Periodontal status was assessed by trained dentists using the community periodontal index. To identify the presence of NAFLD, biochemical data were defined using two validated indicators: the fatty liver index (FLI) and the hepatic steatosis index (HSI). The associations of the presence of periodontal pockets with FLI and HSI were evaluated by multivariable logistic regression analysis after adjusting for age, income, education level, smoking status, alcohol consumption, physical activity, diabetes mellitus, obesity, hypertension, and hypercholesterolemia.Results: The adjusted means in the FLI indicator increased in the presence of periodontal pockets, whereas there was no significant difference in the HSI (P = 0.005 for FLI; P = 0.142 for HSI). Periodontal pockets were consistently associated with the two NAFLD indicators in the sequential logistic models for women throughout the adjustment process. (OR = 1.77, 95% CI = 1.05 to 2.98 for FLI, OR = 1.64, 95% CI = 1.08 to 2.51 for HSI).Conclusions: Our findings showed that the presence of periodontal pockets may be independently associated with NAFLD indicators. Further study will be clarified by well-designed longitudinal studies. [ABSTRACT FROM AUTHOR]

Published
2020
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