Preparation and Physical Properties of Nylon 6/Silica Nanocomposites
| Autor: | 江俊杰 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 This study was aimed to prepare surface-modified silica followed by melt blending with Nylon 6 via two processes. One is the adsorption of cationic surfactant on silica, the other is the grafting of styrene/glycidyl methacrylate copolymer on silica surface though surface polymerization. These surface-modified silicas has been applied to preparation of Nylon 6/silica nanocomposites through melt mixing. Differential Scanning Calorimeter (DSC) result showed that the addition of silica into nylon 6 matrix increase the crystallization rate as well as the crystallization peak temperature (Tp) and also induce the crystallization into the less stable γcrystalline form. Non-isothermal crystallization kinectics data shows that the Avrami index, n, of vigin nylon 6 is 2.74 whereas for the nylon 6/silica nanocomposites with 5 wt% content is 4.89. Transmission electron microscopy (TEM) reveals the surface-modified silica in nylon 6 matrix is well dispersed. Finally, nylon 6 /silica nanocomposites were analyzed by DMA for measuring storage modulus (E’), loss modulus (E”) and loss factor (tanδ). The storage modulus of nanocomposites containing 5 wt% silica modfied by adsorption of single cationic surfactant layer was 2.1 times that of virgin nylon 6. For silica modified by poly(styrene-glycidyl methacrylate) copolymer with silica content of 5 wt%, the storage modulus was 2.7 times that of pure nylon 6. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|