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음이온성 공중합 폴리에스터/Dodecylbenzenesulfonate 블렌드 필름의 열적 특성 및 알칼리 감량
지민호,이종환,홍충희,엄대길,김선홍,최진욱,백두현,Jee, Min Ho,Lee, Jong Hwan,Hong, Choong Hee,Eom, Dae Gil,Kim, Sun Hong,Choi, Jin Uk,Baik, Doo Hyun 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.1
A series of anionic copolyester/dodecylbenzenesulfonate (DBS) blend films were prepared by a melt-compounding method and then annealed under a range of conditions. To eliminate possible experimental errors in measuring the alkaline reduction rate of the samples, the crystallinity should be uniform. We used Fourier transform infrared (FT-IR) spectroscopy to measure and control the relative crystallinity of the annealed samples. The relationship between the crystallinity and reduction rate, as well as the annealing conditions of the annealed blend samples, was derived. FT-IR analysis showed that the crystallization rate of copolyester/DBS blend films is lower than that of pure copolyester. However, the alkaline weight reduction rate of the blend films, which have similar crystallinities, increases dramatically with increasing DBS content, even at a low DBS content of 1 to 3 wt%, although the effect of the DBS becomes negligible above 5 wt%. However, unlike the result for annealed films, the alkaline weight reduction rate for amorphous films exhibited a linear relationship between the alkaline reduction rate and the DBS content for all of the examined DBS content, demonstrating that the effects of the DBS on the alkaline weight reduction of the copolysester could be affected by processing conditions such as post-drawing and annealing.
고밀도 폴리에틸렌 섬유의 가닥수에 따른 크리프 특성 및 예측
강동훈,최재호,장기혁,홍충희,박원호,Kang, Dong Hoon,Choi, Jae Ho,Jang, Ki Hyuk,Hong, Choong Hee,Park, Won Ho 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.2
igh-density polyethylene (HDPE) is widely used in industrial applications due to its versatility and chemical resistance. Lately, its versatility has been further expanded by surface cross-linking and modification. Also, reduction in the weight of polyethylene is one of the most important requirements in the industry. Creep test is a common method for studying the behavior of materials over a long period of time to design their industrial applications. Since a conventional creep test requires more than a test time of 10,000 h, a relatively short-time creep behavior can be predicted using time-temperature superposition (TTS) or mathematical modeling. The long-term creep behavior can be predicted by mathematical modeling using the short-term creep data. In this study, the creep behavior of HDPE fibers was measured in the load range of 20-50% of the ultimate tensile strength (UTS), and compared in terms of the number of filaments and denier. The long-term creep behavior was successfully predicted using the short-term creep behavior data obtained by mathematical modeling. Therefore, this approach can be used to predict the number and denier of PE fibers in industrial applications.