S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Crystallization Kinetics of Maleated Polypropylene/Clay Hybrids
|dc.identifier.citation||Ind. Eng. Chem. Res., 2004, 43, 6082-6089||en|
|dc.description.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.||en|
|dc.description.sponsorship||We are very grateful to the financial support from the National Research Laboratory Program (Grant MI-0104-00-0191) and the Korean Ministry of Education through the Brain Korea 21 Program at Seoul National University. WAXS experiments performed at PLS were supported in part by MOST and POSCO.||en|
|dc.publisher||American Chemical Society||en|
|dc.title||Crystallization Kinetics of Maleated Polypropylene/Clay Hybrids||en|
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