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Crystallization Kinetics of Maleated Polypropylene/Clay Hybrids
Cited 51 time in
Web of Science
Cited 52 time in Scopus
- Authors
- Issue Date
- 2004-08-13
- Publisher
- American Chemical Society
- Citation
- Ind. Eng. Chem. Res., 2004, 43, 6082-6089
- Abstract
- 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 barriers for crystallization. Interestingly, these well-dispersed exfoliated silicates change the crystal orientation as well as the crystallization kinetics of mPP in mPP/OLS nanocomposites, showing larger (040) peak than (110) peak for the α form crystal in WAXS profiles.
- ISSN
- 0888-5885 (print)
1520-5045 (online)
- Language
- English
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