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수용성 싸이오카보네이트 고분자 제조와 구리이온 결합 연구
손민진,도정윤 한국고분자학회 2023 폴리머 Vol.47 No.6
수용성 싸이오카보네이트 고분자를 합성하기 위해 알콜기, 트리에틸렌글리콜, morpholine이 결합된 단분자를 합성하고 양이온 개환고분자 반응을 진행하였다. Morpholine이 결합된 단분자는 CF3CO2H 용매조건에서 아민의 중합 방해 기능을 억제시켜 고분자로 전환될 수 있었다. 구리(II) 이온 수용액에 합성된 고분자를 첨가하여 구리이온의 농도 변화를 관찰하였다. 구리이온의 농도는 첨가된 로다민 화학센서의 흡광도로 결정하였다. 구리와 로다민센서의 혼합 몰비를 1/2로 유지된 마이크로몰의 묽은 용액에서 흡광도 변화를 관찰하였다. 고분자 첨가에 따라 흡광도 감소가 일어났고 구리-고분자 결합 효과로 설명되었다. 0.5 µM의 구리이온은 200 ppm의 고분자를 첨가할 때 560 nm에서 흡광도가 약 1/4로 줄어들었다.
SBR/Organoclay Nanocomposites for the Application on Tire Tread Compounds
김욱수,이동현,김일진,손민진,조성규,김원호 한국고분자학회 2009 Macromolecular Research Vol.17 No.10
N,N-dimethyldodecylamine (tertiary amine)-modified MMT (DDA-MMT) was prepared as an organically modified layered silicate (OLS), after which styrene-butadiene rubber (SBR) nanocomposites reinforced with the OLS were manufactured via the latex method. The layer distance of the OLS and the morphology of the nanocomposites were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). By increasing the amount of N,N-dimethyldodecylamine (DDA) up to 2.5 g, the maximum values of torque, tensile strength and wear resistance of the SBR nanocomposites were increased due to the increased dispersion of the silicate layers in the rubber matrix and the increased crosslinking of the SBR nanocomposites by DDA itself. When SBR nanocomposites were manufactured by using the ternary filler system (carbon black/silica/OLS) to improve their dynamic properties as a tire tread compound, the tan δ (at 0 ℃ and 60 ℃) property of the compounds was improved by using metal stearates instead of stearic acid. The mechanical properties and wear resistance were increased by direct substitution of calcium stearate for stearic acid because the filler-rubber interaction was increased by the strong ionic effect between the calcium cation and silicates with anionic surface. However, as the amount of calcium stearate was further increased above 0.5 phr, the mechanical properties and wear resistance were degraded due to the lubrication effect of the excessive amount of calcium stearate. Consequently, the SBR/organoclay nanocomposites that used carbon black, silica, and organoclay as their ternary filler system showed excellent dynamic properties, mechanical properties and wear resistance as a tire tread compound for passenger cars when 0.5 phr of calcium stearate was substituted for the conventionally used stearic acid.