| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 나노구조와 물성 |
| 제목 | New Type of High Temperature Organophilic Layered Silicates for Polymeric Nanocomposite |
| 초록 | Surface modification of clay minerals has become increasingly important for improving the practical applications of clays such as polymeric nanocomposites. The layered silicates modified with organic chemicals are widely used as nanosized fillers. Commercially available organophilic layered silicates (OLS) with alkyl chain modifier have a critical problem that the aliphatic components limit the thermal and mechanical properties. Pratically, commecially available OLS such as Cloisite series begins to degrade at temperature below 200℃. Most of polymers, however, are processed at the temperatures above 200℃, implying that the commercially available organophilic layered silicates are not suitable for the preparation of polymeric nanocomposites because thermally fragile modifiers in the silicates are degraded at the processing temperature. Fig. 1. Schematic Route to organophilic layered silicate modified with polystyrene. To solve these problems, we designed the oligomeric modifiers free from aliphatic components, and successfully developed a route to an amine functionalized oligomers based on oligo(ethersulfone) and oligostyrene. These modifiers having onium ion effectively ion-exchanged with Na-MMT(montmorillonite) to form an OLS. Several type of novel OLSs showed high degree of substitution and enlarged gallary spacing and high thermal stability. By solution and melt blending nanohybridization method, an exfoliated structure of nanocomposite based on polyimide, polystyrene, polysulfone are obtained. This means that the modification on the layered silicate surface leads to the full dispersion of the clay platelets. And also, we observed the improvement of thermal stability mataining their inherent transparency as increment of OLS content. High-temperature OLSs appear to offer excellent potential as a nanoconstruction site for the synthesis of materialsas high-temperature nanocomposite. |
| 저자 | 김용석, 이재흥, 최길영 |
| 소속 | 한국화학(연) |
| 키워드 | surface treatment; heat resistance; layered silicate; nanocomposite |
