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Four kinds of imidazolium surfactants with high thermal stability were designed and synthesized accordingly. The structures of these surfactants were characterized by 1 H NMR spectra. The TGA results indicated that the thermal stabilities of these surfactants with saturated alkyl groups were relatively high and the initial decomposition temperatures at 5% weight loss (T 0.05 ) were...
A kind of β-nucleating agent, namely a stearic acid and stearate lanthanum complex (NAβ), was introduced into isotactic polypropylene (i-PP) via an in situ polymerization method for the first time. A dynamic adhesion model was constructed for interpreting the β-nucleating agent dispersion process. The effects of a polymerized dispersion of the β-nucleating agent on the content of β-crystal and crystallization...
Alkyltriphenylphosphonium-modified montmorillonite(PMMT) was used to prepare TiCl 4 /MgCl 2 /PMMT compound catalyst and exfoliated i-PP/PMMT nanocomposites were prepared by in situ intercalative polymerization of propylene with TiCl 4 /MgCl 2 /PMMT catalyst. The catalytic efficiency of the above catalyst under optimum polymerization condition could reach as high as...
The shear-induced crystallization behavior of isotactic polypropylene (i-PP) has been investigated by in situ optical microscope under various thermal and shear histories. A shish-kebab structure during growth was observed under a well controlled, however, weak shear field. According to our results under these weak shear and thermal history, a modified model was proposed for the growing process of...
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