화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2019년 가을 (10/09 ~ 10/11, 제주컨벤션센터)
권호 44권 2호
발표분야 고분자구조 및 물성
제목 Autophobic Dewetting Triggered Stability of Polymer Grafted Nanoparticles in Polymer Nanocomposites
초록 While polymer grafting is frequently employed to improve the particle stability in polymer nanocomposites (PNCs), the chemistry of the grafting polymer needs to be the same as the matrix polymer to screen the unfavorable enthalpic interactions between particle and polymers. However, the grafted corona causes autophobic dewetting by expelling the matrix polymers from the interface when molecular weight (MW) ratio of matrix (P) to grafted (N) polymers exceeds 1. Here, we report that autophobic dewetting behavior of entangled poly(ethylene glycol) (PEG) can improve or disturb the particle dispersion stability of PNCs using a short chain PEG-grafted silica particle at P/N=21. We found that conformation change of matrix polymer significantly influences on the dispersion stability depending on the particle separation distance compared to the matrix polymer chain size, characterized by SAXS, proton time-domain NMR, and rheometry experiments.
저자 권나경, 김소연
소속 울산과학기술원
키워드 autophobic dewetting; polymer nanocomposties; polymer grafting
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