화학공학소재연구정보센터
학회 한국화학공학회
학술대회 1999년 가을 (10/22 ~ 10/23, 경남대학교)
권호 5권 2호, p.3997
발표분야 이동현상
제목 In-situ 상용화제를 포함하는 비상용성 고분자 블렌드의 모폴로지 전개에 반응속도가 미치는 영향
초록 The effect of reaction rate on the morphology of reactive blends has been studied using 75/25 (wt/wt) mono-carboxylated polystyrene [PS-mCOOH]/poly(methyl methacrylate) [PMMA] with poly (methyl methacrylate-ran-glycidyl methacrylate) [PMMA-GMA] as an in-situ compatibilizer, by varying the amount of PMMA-GMA in the blend, the molar concentration of GMA, CGMA, 0 in PMMA-GMA at fixed molecular weight, and the molecular weight of PMMA-GMA at fixed CGMA, 0. For the blends with PMMA-GMA having lower CGMA, 0, there exists a critical amount of PMMA-GMA above which a sharp decrease in the volume average domain size (Dv) occurs. This amount was shifted to a smaller value with increasing CGMA, 0 in PMMA-GMA. We demonstrated that the interfacial graft reaction between PS-mCOOH and PMMA-GMA at 220 oC was described by the simple second-order reaction kinetics, i.e., mean field reaction kinetics. From the morphological evolution, it is found that the morphological change by an external flow from a pellet size to Dv withless than 1 ?m occurred within a very short time of ~ 30s. After this transition, coalescence is the main mechanism for determining the final morphology obtained at a mixing time of 20 min. Finally, a master curve is obtained when Dv is plotted against CGMA, 0, implying again that the concept of mean field reaction kinetics adequately applies to the blends employed in this study.
저자 전현경, 김진곤
소속 포항공과대
키워드 In-situ Compatibilizer; Morphology; Reaction Rate; Reactive Blend
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