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조창기,오병석 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.3
Well-defined poly(styrene-g-caprotactone) copolymers (PS-g-PCL) were synthesized and they were used as the compatibilizers for polycarbonate (PC) and polystyrene (PS) blends. For the PS-g-PCL graft copolymers, polycaprolactone macromer having M,, of 8,700 g/mole and polydispersity of 1.07 was copolymerized with styrene via radical polymerization. The PS/PCL weight ratio of the three obtained graft copolymers was 50/50, and the number of PCL branches per polymer chain were 3, 6, and 8. Thermal analysis showed that the three graft copolymers contain crystalline PCL phase. Scanning electron microscopy (SEM) pictures showed that the domain size of PS decreased when the contents of the graft copolymer containing 3 branches increased from 1 to 5 wt% in PC/PS ,)0170 wtfc blends. A weak melting endotherm on the differential scanning calorimetric analysis indicates that not all PCL branches are situated on the PC/PS interface when the content of the graft copolymer is more than 3 wt%. When 5 wt% of each graft copolymer wa.1 blended, the sizes of PS domain of the three PC/PS 30/70 wt% blends were similar but slightly larger when the number of branch of graft copolymer was 8.
Study on Moisture Absorption Characteristics of Superabsorbent/Sepiolite Composites
조창기,변성윤 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Sepiolite is one of many naturally occurring nano needle-shaped clay materials, composed of hydrated magnesium silicate, and it has been used to increase the mechanical, physical, and thermal properties of a polymer. In this study sepiolite was used as a filler component in superabsorbent polymer composites to regulate the moisture absorption capability of a hydrophilic polymer. Water soluble monomers were polymerized in the presence of sepiolite dispersion, and the products were isolated to make sepiolite/polymer composites. Moisture absorption performance of the composites were evaluated at constant temperature and relative humidity using a thermo-hygrostat.