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전기방사 거동의 정밀제어를 위한 전기방사 불안정성에 관한 기초적 연구
예나경,김한성,Ye, Nakyung,Kim, Hanseong 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4
In this study, the instabilities of electrospinning were observed and evaluated by measuring the drop area, the current, and the electrical force using PVAc and PVA. Those values were measured simultaneously during electrospinning and the instabilities were analyzed as a function of time. The electrospinning was carried out by changing the voltages and the feed rates. The results suggest that different electrospinning conditions such as voltage, polymer, and flow rate caused different behaviors of instabilities, current and electric force, however, all the used methods were effective for studying the instabilities in electrospinning.
바이오 기반 폴리머가 포함된 블렌드의 상압 및 가압 발포 연구
한동훈,김영민,이단비,손성호,서건희,김한성,Dong-Hun Han,Young-Min Kim,Danbi Lee,Seongho Son,Geon-hee Seo,Hanseong Kim 한국복합재료학회 2023 Composites research Vol.36 No.5
There are several methods for shaping foams, but the most commonly used methods involve the use of resin mixed with a foaming agent, which is then foamed under high temperature and pressure in the case of compression foaming, or foamed under high temperature without applying pressure in the case of atmospheric foaming. The polymers used for foaming require design and analysis of optimal foaming conditions in order to achieve foaming under ambient pressure. Environmentally friendly bio-based polymers face challenges when it comes to foaming on their own, which has led to ongoing research in blending them with resins capable of traditional foam production. This study investigates changes in the characteristics of bio-based polymer-EVA blend foams based on variations in the content of bio-based polymers and explores the optimal foaming conditions according to crosslinking. The correlation between foaming characteristics and mechanical properties of the foams was examined. Through this research, we gained insights into how the content of bio-based polymers affects the properties of foams containing bio-based polymers and identified differences between ambient pressure and high-pressure foaming processes. Additionally, the feasibility of commercializing bio-based polymer-EVA composite foams was confirmed.