| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 복합재료 |
| 제목 | Characteristics of Polypropylene/Polstyrene/Clay Nanocomposites by High Intensity Ultrasonic Blend Process |
| 초록 | Polymer/layered silicate nanocomposites are a new class of hybrid materials of an organic polymer matrix in which silicates of nanoscale dimensions are imbeded. The silicates dispersed well in the polymer matrix improve more dramatically thermal stability, mechanical properties, frame retardant and gas permeability even though their amount is small, compared to conventional composites. From a material science and engineering point of view, the major advantage is in the dramatically enhance properties. When the clays are dispersed in a polymer matrix, they are either intercalated by macromolecules or exfoliated. The best performances are commonly observed for the exfoliated nanocomposites. However, this is very difficult to attain by simple mixing method. So, we used high intensity ultrasound with melt processing to overcome the limitation of existing methods. For the effective mixing, a special intensive mixer equipped with ultrasonic generator was employed. Thus, ultrasonic assisted melt processing was expected to achieve effective breakup of the clay agglomerates and exfoliation of the silicate layers to yield useful various polymer–clay nanocomposites. In this study, polymer-clay nanocomposites of various concentrations were prepared by ultrasonically assisted melt blend process. The ultrasonic blend process using high intensity ultrasonic wave was employed to enhance nano-scale dispersion during melt mixing of polymer blend and organically modified clay. We expected enhanced breakup of layered silicate bundle and further reduction in the size of dispersed phase with better homogeneity compared to the different immiscible blend pairs. Also, it was expected that generation of macroradicals in polymer mixture can lead to in-situ copolymer formation by their mutual combination, which should be an efficient path to compatibilize immiscible polymer blends and stabilize their phase morphology in the absence of other chemical agents. The pictures of scanning electron microscope (SEM, Hithach s-2500) were used to investigate the morphology of the blends. And X-ray diffraction (XRD) has application to characterize the structures of the nanocomposites. The thermal stabilities were compared neat polymer and nanocomposites by TGA (TA instrument). The rheological behaviors of obtained nanocomposites were measured with rotational rheometer (Rheometric science, ARES). |
| 저자 | 김경일, 이재욱 |
| 소속 | 서강대 |
| 키워드 | nanocomposites; ultrasound; polypropylene; polyamide; blends |
