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  • 09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Molecular characterization of butadiene rubber using size-exclusion chromatography and thermal field-flow fractionation/multi-angle light scattering

2014년 9월 4일 16시 29분 57초
ANAL.P-596 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
조예윤, 최재영, DouHaiyang, 이승호*
한남대학교 화학과, Korea
Rubber has a significant role in tire industry, which tries to attain a better compromise between the wear and rolling resistance, and ice and wet grip properties of tire tread compounds. Butadiene rubber (BR) is used widely in tire tread compounds, hoses, and conveyor belts. Molecular weight (MW) and gel content are important parameters of polymers as they influence the physical, mechanical, and rheological properties of the polymers. Small difference in low or high MW fractions can result in significant differences in end use properties. Thus the molecular weight distribution (MWD) of a polymer is one of important parameters in quality control, monitoring of product stability, reclaiming off-spec material, and development of new materials. Thermal field-flow fractionation (ThFFF) is a polymer separation technique whose operation is controlled by the thermal diffusion coefficient, DT, a basic transport parameter describing the movement of a matter under a temperature gradient. ThFFF is useful for MW-based separation and molecular characterization of various types of polymers. ThFFF channel is open (unpacked), and is particularly useful for separation of polymers of high MW that are susceptible to shear degradation or those containing microgel. ThFFF can provide separation of microgels from the soluble species. Size exclusion chromatography (SEC) is a particularly valuable tool in the measurement of the molecular weights and molecular weight distributions of polymers. Online-coupling of ThFFF with a multi angle light scattering (MALS) and a concentration detector such as refractive index (RI) or UV/VIS detector yields the molar mass and root-mean-square (RMS) radius (Rg) of each ThFFF slice, and thus the conformational information of the molecules. In this study, ThFFF coupled online with a MALS and a RI detector (ThFFF-MALS-RI) was employed for molecular characterization BR’s from various sources. ThFFF provided a good separation of the microgel particles from the soluble polymers with enhanced sensitivity by MALS for the microgel particles. ThFFF results were compared with those from SEC. Results suggest ThFFF-MALS-RI is a powerful tool for analysis of various types of microgel-containing polymeric materials.