| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 가공/블렌드 |
| 제목 | The Effect of Organically Modified Layered Silicate on the Coalescence and Breakup of Droplets in Immiscible Polymer Blends |
| 초록 | In this study, we investigated the effect of organically modified nanoclay (organoclay) on the morphology of immiscible polymer blends (Poly(1,4-butylene terephthalate)(PBT)/polyethylene(PE)) with various compositions of PBT ranging from 1 to 90 wt%. Experimentally, the morphology and rheology of PBT/PE blends was investigated using SEM, TEM, XRD, and the rheological measurement and they were compared with the results of PBT/PE nanocomposites. The TEM observations show that the addition of a small amount of organoclay to the blend results in a high degree of exfoliation, with the exfoliated organoclay being located in the interface between PBT and PE phase. The organoclay located in the interface forms the interfacial phase with a non-homogeneous distribution of clay along the interface and changes the interfacial tension. The effect of the organoclay to suppress the coalescence of the droplets effectively reduces the droplet size. Also, rigid organoclay with a high aspect ratio endows the blend morphology with long-term thermal stability by suppressing the Brownian motion. On the other hand, as its content is increased, the organoclay is sucked into a specific component depending on the preference of the organoclay. It brings out the improvement of rheological properties of this particular component, which means that the change in the viscosity ratio. The change in the viscosity ratio, together with the coalescence suppression effect, contributes to the determination of the droplet size, depending on the location of the organoclay. Therefore, the organoclay plays the role of suppressing the coalescence of the droplets in the interface, while simultaneously influencing the breakup of the droplets by changing the viscosity ratio. |
| 저자 | 홍정숙1, 남궁한2, 김용경2, 안경현2, 이승종2 |
| 소속 | 1고려대, 2서울대 |
| 키워드 | Droplet size; Coalescence; Breakup; Blend nanocomposite; Rheology |
