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        Emulsion Grafting Vinyl Monomers onto Starch for Reinforcement of Styrene-Butadiene Rubber

        Mei-Chun Li,Xin Ge,조을룡 한국고분자학회 2013 Macromolecular Research Vol.21 No.5

        Three types of modified starches (MST): Starch-g-poly(butyl acrylate) (ST-g-PBA), starch-g-poly (methyl methacrylate) (ST-g-PMMA) and starch-g-polystyrene (ST-g-PS) latexes were successfully synthesized by emulsion polymerization. These synthesized MST latexes were then directly compounded with styrene-butadiene rubber (SBR) latex in order to prepare MST/SBR compounds. The vulcanization characteristics, morphology, swelling ratio, mechanical and dynamic mechanical properties were investigated. Results indicated that the incorporation of starch or MST led to both an increase in the torque values and the cure rate of SBR compounds. MST with a particle size of approximately 200-400 nm uniformly dispersed in the SBR matrix, indicating the significantly improved dispersion. MST/SBR compounds exhibited better mechanical properties compared with starch/SBR (ST/SBR)compounds. Among the MST/SBR compounds, ST-g-PMMA/SBR compounds showed optimum tensile strength,which was even higher than that of carbon black/SBR (CB/SBR) compounds with the same loading of fillers. Finally, the reinforcing mechanism of MST in the SBR matrix was discussed.

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        Mechanical Performance, Water Absorption Behavior and Biodegradability of Poly(methyl methacrylate)-Modified Starch/SBR Biocomposites

        Mei-Chun Li,Xin Ge,조을룡 한국고분자학회 2013 Macromolecular Research Vol.21 No.7

        Natural corn starch was modified by surface grafting with poly(methyl methacrylate) (PMMA) through emulsion copolymerization and then compounded with styrene-butadiene rubber (SBR) latex in order to prepare PMMA-modified starch/SBR biocomposites. The effect of methyl methacrylate (MMA) and starch concentration on the mechanical properties, morphology, toluene swelling behavior, water absorption behavior and biodegradability of PMMA-modified starch/SBR biocomposites was investigated. Results showed that the optimum mechanical properties were achieved when the concentrations of MMA and starch were 10 and 30 phr, respectively, which could be also confirmed through the observations from FE-SEM micrographs and equilibrium welling test. Guth-Gold and Halpin-Tsai models were employed to predict the modulus of PMMA-modified starch/SBR biocomposites. Halpin-Tsai model was better fitted with the experimentally measured data than Guth-Gold model. The water absorption ratio of PMMA-modified starch/SBR biocomposites was strongly influenced by the immersion time and the starch concentration, which further caused a significant effect on the biodegradability of biocomposites.

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        EPDM 고무/유기 벤토나이트 복합체의 제조

        Xin Ge,Mei Chun Li,조을룡(Ur Ryoung Cho) 한국고분자학회 2014 폴리머 Vol.38 No.1

        고무 매트릭스와 벤토나이트의 상용성을 향상시키기 위하여 유기개질 벤토나이트는 벤토나이트 현탁액에서실란커플링제인 [3-(2-aminoethylamino)propyl]trimethoxysilane(AEAPTMS)]를 사용하여 합성되었다. 유기개질 벤토나이트의 구조와 특성을 FTIR-spectroscopy, thermogravimetric analysis(TGA) and X-ray diffraction(XRD) 등을 사용하여 분석하였다. Ethylene-propylene-diene monomer(EPDM) 고무와 유기 벤토나이트를 two-roll mill에서 배합하였으며 가황을 하고 물성을 측정하였다. 벤토나이트 개질에 대하여 염산과 물의 농도가 복합체의 물성에 중요한 영향을 미치는 것으로 확인되었다. 벤토나이트의 함량이 20 phr 포함된 복합체의 경우 가장 좋은 물성을 나타내었고 인장강도는 1.95에서 4.8 MPa로 증가되었으며 신장률은 300에서 500%로 증가하는 경향을 보였다. To improve the compatibility of bentonite with rubber matrix, organo-modified bentonite was synthesized witha silane coupling agent, [3-(2-aminoethylamino)propyl]trimethoxysilane (AEAPTMS) in the suspension of bentonite. Thestructure and characteristics of organo-modified bentonite were investigated using FTIR-spectroscopy, thermogravimetricanalysis (TGA) and X-ray diffraction (XRD). Ethylene-propylene-diene monomer (EPDM) rubber/organo-bentonitecomposites were compounded by a two-roll mill. The vulcanization and mechanical properties were studied. Resultsshowed that the concentration of hydrochloric acid and H2O in the synthesis had significant influence on the modificationof bentonite, which further contributed to the properties of the composites. Filled with 20 phr modified bentonite, the tensilestrength and elongation at break of the rubber increased from 1.95 to 4.8 MPa and 300% to 500%, respectively.

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