Crystallization Kinetics of Maleated Polypropylene/Clay Hybrids
| Autor: | Baekjin Kim, Joohyeon Park, Bongwoo Ha, Seung-Heon Lee, Daewon Lee, Kookheon Char |
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| Rok vydání: | 2004 |
| Předmět: |
Polypropylene
Materials science Nanocomposite General Chemical Engineering Intercalation (chemistry) Maleic anhydride General Chemistry Industrial and Manufacturing Engineering Silicate law.invention chemistry.chemical_compound Differential scanning calorimetry Montmorillonite chemistry Chemical engineering law Polymer chemistry Crystallization |
| Zdroj: | Industrial & Engineering Chemistry Research. 43:6082-6089 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | The isothermal crystallization kinetics of maleic anhydride grafted polypropylene (mPP) in hybrids with unmodified or organically modified montmorillonite (MMT), which have been prepared by melt intercalation in a mixer, has been investigated by using time-resolved wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC). WAXS and transmission electron microscopy (TEM) showed that the mPP/unmodified MMT hybrids formed macrophase-separated mixtures rather than intercalated nanocomposites, while mPP/organically layered silicate (OLS) hybrids formed exfoliated nanocomposites. The crystallization rate of mPP/unmodified silicate hybrids became faster with the MMT addition because agglomerated silicates in the mPP matrix act as nucleating agents. On the other hand, the crystallization rate of the mPP/OLS hybrids was slowed with the OLS addition. This retardation of the mPP crystallization is probably due to the presence of well-dispersed exfoliated silicates as diffusion or displacement ba... |
| Databáze: | OpenAIRE |
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